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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">Transcriptomics technologies</span></span>
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<p>
<b>Transcriptomics technologies</b> are the techniques used to study an organism's <a href="Transcriptome" title="Transcriptome">transcriptome</a>, the sum of all of its <a href="RNA" title="RNA">RNA transcripts</a>. The information content of an organism is recorded in the DNA of its <a href="Genome" title="Genome">genome</a> and <a href="Gene_expression" title="Gene expression">expressed</a> through <a href="Transcription_(genetics)" class="mw-redirect" title="Transcription (genetics)">transcription</a>. Here, <a href="MRNA" class="mw-redirect" title="MRNA">mRNA</a> serves as a transient intermediary molecule in the information network, whilst <a href="Non-coding_RNA" title="Non-coding RNA">non-coding RNAs</a> perform additional diverse functions. A transcriptome captures a snapshot in time of the total transcripts present in a <a href="Cell_(biology)" title="Cell (biology)">cell</a>. Transcriptomics technologies provide a broad account of which cellular processes are active and which are dormant.
A major challenge in molecular biology is to understand how a single genome gives rise to a variety of cells. Another is how gene expression is regulated.
</p><p>The first attempts to study whole transcriptomes began in the early 1990s. Subsequent technological advances since the late 1990s have repeatedly transformed the field and made transcriptomics a widespread discipline in biological sciences. There are two key contemporary techniques in the field: <a href="Microarray" title="Microarray">microarrays</a>, which quantify a set of predetermined sequences, and <a href="RNA-Seq" title="RNA-Seq">RNA-Seq</a>, which uses <a href="DNA_sequencing#Next-generation_methods" title="DNA sequencing">high-throughput sequencing</a> to record all transcripts. As the technology improved, the volume of data produced by each transcriptome experiment increased. As a result, data analysis methods have steadily been adapted to more accurately and efficiently analyse increasingly large volumes of data. Transcriptome databases have consequently been growing bigger and more useful as transcriptomes continue to be collected and shared by researchers. It would be almost impossible to interpret the information contained in a transcriptome without the knowledge of previous experiments.
</p><p>Measuring the expression of an organism's <a href="Gene" title="Gene">genes</a> in different <a href="Tissue_(biology)" title="Tissue (biology)">tissues</a> or <a href="Environment_(biophysical)" class="mw-redirect" title="Environment (biophysical)">conditions</a>, or at different times, gives information on how genes are <a href="Regulation_of_gene_expression" title="Regulation of gene expression">regulated</a> and reveals details of an organism's biology. It can also be used to infer the <a href="Phenotype" title="Phenotype">functions</a> of previously <a href="DNA_annotation" title="DNA annotation">unannotated</a> genes. Transcriptome analysis has enabled the study of how gene expression changes in different organisms and has been instrumental in the understanding of human <a href="Disease" title="Disease">disease</a>. An analysis of gene expression in its entirety allows detection of broad coordinated trends which cannot be discerned by more targeted <a href="Assay" title="Assay">assays</a>.
</p>
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<div class="mw-heading mw-heading2"><h2 id="History">History</h2></div>

<p>Transcriptomics has been characterised by the development of new techniques which have redefined what is possible every decade or so and rendered previous technologies obsolete. The first attempt at capturing a partial human transcriptome was published in 1991 and reported 609 <a href="Messenger_RNA" title="Messenger RNA">mRNA</a> sequences from the <a href="Human_brain" title="Human brain">human brain</a>.<sup id="cite_ref-ref2047873_2-0" class="reference"><a href="#cite_note-ref2047873-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> In 2008, two human transcriptomes, composed of millions of transcript-derived sequences covering 16,000 genes, were published,<sup id="cite_ref-#18978789_3-0" class="reference"><a href="#cite_note-#18978789-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#18599741_4-0" class="reference"><a href="#cite_note-#18599741-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> and by 2015 transcriptomes had been published for hundreds of individuals.<sup id="cite_ref-#24037378_5-0" class="reference"><a href="#cite_note-#24037378-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#25954002_6-0" class="reference"><a href="#cite_note-#25954002-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> Transcriptomes of different <a href="Disease" title="Disease">disease</a> states, <a href="Tissue_(biology)" title="Tissue (biology)">tissues</a>, or even single <a href="Cell_(biology)" title="Cell (biology)">cells</a> are now routinely generated.<sup id="cite_ref-#25954002_6-1" class="reference"><a href="#cite_note-#25954002-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#24524133_7-0" class="reference"><a href="#cite_note-#24524133-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#26000846_8-0" class="reference"><a href="#cite_note-#26000846-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> This explosion in transcriptomics has been driven by the rapid development of new technologies with improved sensitivity and economy.<sup id="cite_ref-#23290152_9-0" class="reference"><a href="#cite_note-#23290152-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#19015660_10-0" class="reference"><a href="#cite_note-#19015660-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#21191423_11-0" class="reference"><a href="#cite_note-#21191423-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#19715439_12-0" class="reference"><a href="#cite_note-#19715439-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading3"><h3 id="Before_transcriptomics">Before transcriptomics</h3></div>
<p>Studies of individual <a href="Primary_transcript" title="Primary transcript">transcripts</a> were being performed several decades before any transcriptomics approaches were available. <a href="CDNA_library" title="CDNA library">Libraries</a> of <a href="Antheraea_polyphemus" title="Antheraea polyphemus">silkmoth</a> mRNA transcripts were collected and converted to <a href="Complementary_DNA" title="Complementary DNA">complementary DNA</a> (cDNA) for storage using <a href="Reverse_transcriptase" title="Reverse transcriptase">reverse transcriptase</a> in the late 1970s.<sup id="cite_ref-#519770_13-0" class="reference"><a href="#cite_note-#519770-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup> In the 1980s, low-throughput sequencing using the <a href="Sanger_sequencing" title="Sanger sequencing">Sanger</a> method was used to sequence random transcripts, producing <a href="Expressed_sequence_tag" title="Expressed sequence tag">expressed sequence tags</a> (ESTs).<sup id="cite_ref-ref2047873_2-1" class="reference"><a href="#cite_note-ref2047873-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#6956902_14-0" class="reference"><a href="#cite_note-#6956902-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#6687628_15-0" class="reference"><a href="#cite_note-#6687628-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#9448457_16-0" class="reference"><a href="#cite_note-#9448457-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup> The <a href="Sanger_sequencing" title="Sanger sequencing">Sanger method of sequencing</a> was predominant until the advent of <a href="DNA_sequencing#High-throughput_methods" title="DNA sequencing">high-throughput methods</a> such as <a href="Sequencing_by_synthesis" class="mw-redirect" title="Sequencing by synthesis">sequencing by synthesis</a> (Solexa/Illumina). <a href="Expressed_sequence_tag" title="Expressed sequence tag">ESTs</a> came to prominence during the 1990s as an efficient method to determine the <a href="Gene_annotation" class="mw-redirect" title="Gene annotation">gene content</a> of an organism without <a href="Whole_genome_sequencing" title="Whole genome sequencing">sequencing</a> the entire <a href="Genome" title="Genome">genome</a>.<sup id="cite_ref-#9448457_16-1" class="reference"><a href="#cite_note-#9448457-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup> Amounts of individual transcripts were quantified using <a href="Northern_blotting" class="mw-redirect" title="Northern blotting">Northern blotting</a>, <a href="Reverse_northern_blot" title="Reverse northern blot">nylon membrane arrays</a>, and later <a href="Reverse_transcription_polymerase_chain_reaction" title="Reverse transcription polymerase chain reaction">reverse transcriptase quantitative PCR</a> (RT-qPCR) methods,<sup id="cite_ref-#414220_17-0" class="reference"><a href="#cite_note-#414220-17"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#2479917_18-0" class="reference"><a href="#cite_note-#2479917-18"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup> but these methods are laborious and can only capture a tiny subsection of a transcriptome.<sup id="cite_ref-#19715439_12-1" class="reference"><a href="#cite_note-#19715439-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> Consequently, the manner in which a transcriptome as a whole is expressed and regulated remained unknown until higher-throughput techniques were developed.
</p>
<div class="mw-heading mw-heading3"><h3 id="Early_attempts">Early attempts</h3></div>
<p>The word "transcriptome" was first used in the 1990s.<sup id="cite_ref-#10022985_19-0" class="reference"><a href="#cite_note-#10022985-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#9008165_20-0" class="reference"><a href="#cite_note-#9008165-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup> In 1995, one of the earliest sequencing-based transcriptomic methods was developed, <a href="Serial_analysis_of_gene_expression" title="Serial analysis of gene expression">serial analysis of gene expression</a> (SAGE), which worked by <a href="Sanger_sequencing" title="Sanger sequencing">Sanger sequencing</a> of concatenated random transcript fragments.<sup id="cite_ref-#7570003_21-0" class="reference"><a href="#cite_note-#7570003-21"><span class="cite-bracket">[</span>21<span class="cite-bracket">]</span></a></sup> Transcripts were quantified by matching the fragments to known genes. A variant of SAGE using high-throughput sequencing techniques, called digital gene expression analysis, was also briefly used.<sup id="cite_ref-#23290152_9-1" class="reference"><a href="#cite_note-#23290152-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#9331369_22-0" class="reference"><a href="#cite_note-#9331369-22"><span class="cite-bracket">[</span>22<span class="cite-bracket">]</span></a></sup> However, these methods were largely overtaken by high throughput sequencing of entire transcripts, which provided additional information on transcript structure such as <a href="Alternative_splicing" title="Alternative splicing">splice variants</a>.<sup id="cite_ref-#23290152_9-2" class="reference"><a href="#cite_note-#23290152-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading3"><h3 id="Development_of_contemporary_techniques">Development of contemporary techniques</h3></div>
<table class="wikitable floatright" style="width:500px">
<caption><b>Comparison of contemporary methods</b><sup id="cite_ref-#25149683_23-0" class="reference"><a href="#cite_note-#25149683-23"><span class="cite-bracket">[</span>23<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#24454679_24-0" class="reference"><a href="#cite_note-#24454679-24"><span class="cite-bracket">[</span>24<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#19015660_10-1" class="reference"><a href="#cite_note-#19015660-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup>
</caption>
<tbody><tr>
<td>
</td>
<th>RNA-Seq
</th>
<th>Microarray
</th></tr>
<tr>
<td><a href="Throughput" class="mw-redirect" title="Throughput">Throughput</a>
</td>
<td>1 day to 1 week per experiment<sup id="cite_ref-#19015660_10-2" class="reference"><a href="#cite_note-#19015660-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup>
</td>
<td>1–2 days per experiment<sup id="cite_ref-#19015660_10-3" class="reference"><a href="#cite_note-#19015660-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup>
</td></tr>
<tr>
<td><a href="Nucleic_acid_quantitation" title="Nucleic acid quantitation">Input RNA amount</a>
</td>
<td>Low ~ 1 <a href="Orders_of_magnitude_(mass)" title="Orders of magnitude (mass)">ng</a> total RNA<sup id="cite_ref-#22939981_25-0" class="reference"><a href="#cite_note-#22939981-25"><span class="cite-bracket">[</span>25<span class="cite-bracket">]</span></a></sup>
</td>
<td>High ~ 1 μg mRNA<sup id="cite_ref-#11015604_26-0" class="reference"><a href="#cite_note-#11015604-26"><span class="cite-bracket">[</span>26<span class="cite-bracket">]</span></a></sup>
</td></tr>
<tr>
<td>Labour intensity
</td>
<td>High (sample preparation and data analysis)<sup id="cite_ref-#19015660_10-4" class="reference"><a href="#cite_note-#19015660-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#25149683_23-1" class="reference"><a href="#cite_note-#25149683-23"><span class="cite-bracket">[</span>23<span class="cite-bracket">]</span></a></sup>
</td>
<td>Low<sup id="cite_ref-#19015660_10-5" class="reference"><a href="#cite_note-#19015660-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#25149683_23-2" class="reference"><a href="#cite_note-#25149683-23"><span class="cite-bracket">[</span>23<span class="cite-bracket">]</span></a></sup>
</td></tr>
<tr>
<td>Prior knowledge
</td>
<td>None required, although a reference genome/transcriptome sequence is useful<sup id="cite_ref-#25149683_23-3" class="reference"><a href="#cite_note-#25149683-23"><span class="cite-bracket">[</span>23<span class="cite-bracket">]</span></a></sup>
</td>
<td>Reference genome/transcriptome is required for design of <a href="Molecular_probe" title="Molecular probe">probes</a><sup id="cite_ref-#25149683_23-4" class="reference"><a href="#cite_note-#25149683-23"><span class="cite-bracket">[</span>23<span class="cite-bracket">]</span></a></sup>
</td></tr>
<tr>
<td><a href="Quantification_(science)" title="Quantification (science)">Quantitation</a> accuracy
</td>
<td>~90% (limited by sequence coverage)<sup id="cite_ref-EPR_27-0" class="reference"><a href="#cite_note-EPR-27"><span class="cite-bracket">[</span>27<span class="cite-bracket">]</span></a></sup>
</td>
<td>&gt;90% (limited by fluorescence detection accuracy)<sup id="cite_ref-EPR_27-1" class="reference"><a href="#cite_note-EPR-27"><span class="cite-bracket">[</span>27<span class="cite-bracket">]</span></a></sup>
</td></tr>
<tr>
<td>Sequence resolution
</td>
<td>RNA-Seq can detect <a href="Single-nucleotide_polymorphism" title="Single-nucleotide polymorphism">SNPs</a> and splice variants (limited by sequencing accuracy of ~99%)<sup id="cite_ref-EPR_27-2" class="reference"><a href="#cite_note-EPR-27"><span class="cite-bracket">[</span>27<span class="cite-bracket">]</span></a></sup>
</td>
<td>Specialised arrays can detect mRNA splice variants (limited by probe design and cross-hybridisation)<sup id="cite_ref-EPR_27-3" class="reference"><a href="#cite_note-EPR-27"><span class="cite-bracket">[</span>27<span class="cite-bracket">]</span></a></sup>
</td></tr>
<tr>
<td><a href="Sensitivity_and_specificity" title="Sensitivity and specificity">Sensitivity</a>
</td>
<td>1 transcript per million (approximate, limited by sequence coverage)<sup id="cite_ref-EPR_27-4" class="reference"><a href="#cite_note-EPR-27"><span class="cite-bracket">[</span>27<span class="cite-bracket">]</span></a></sup>
</td>
<td>1 transcript per thousand (approximate, limited by fluorescence detection)<sup id="cite_ref-EPR_27-5" class="reference"><a href="#cite_note-EPR-27"><span class="cite-bracket">[</span>27<span class="cite-bracket">]</span></a></sup>
</td></tr>
<tr>
<td><a href="Dynamic_range" title="Dynamic range">Dynamic range</a>
</td>
<td>100,000:1 (limited by sequence coverage)<sup id="cite_ref-#24194394_28-0" class="reference"><a href="#cite_note-#24194394-28"><span class="cite-bracket">[</span>28<span class="cite-bracket">]</span></a></sup>
</td>
<td>1,000:1 (limited by fluorescence saturation)<sup id="cite_ref-#24194394_28-1" class="reference"><a href="#cite_note-#24194394-28"><span class="cite-bracket">[</span>28<span class="cite-bracket">]</span></a></sup>
</td></tr>
<tr>
<td><a href="Reproducibility" title="Reproducibility">Technical reproducibility</a>
</td>
<td>&gt;99%<sup id="cite_ref-#18550803_29-0" class="reference"><a href="#cite_note-#18550803-29"><span class="cite-bracket">[</span>29<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#25150838_30-0" class="reference"><a href="#cite_note-#25150838-30"><span class="cite-bracket">[</span>30<span class="cite-bracket">]</span></a></sup>
</td>
<td>&gt;99%<sup id="cite_ref-#17961233_31-0" class="reference"><a href="#cite_note-#17961233-31"><span class="cite-bracket">[</span>31<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#15846360_32-0" class="reference"><a href="#cite_note-#15846360-32"><span class="cite-bracket">[</span>32<span class="cite-bracket">]</span></a></sup>
</td></tr></tbody></table>
<p>The dominant contemporary techniques, <a href="DNA_microarray" title="DNA microarray">microarrays</a> and <a href="RNA-Seq" title="RNA-Seq">RNA-Seq</a>, were developed in the mid-1990s and 2000s.<sup id="cite_ref-#23290152_9-3" class="reference"><a href="#cite_note-#23290152-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#11287436_33-0" class="reference"><a href="#cite_note-#11287436-33"><span class="cite-bracket">[</span>33<span class="cite-bracket">]</span></a></sup> Microarrays that measure the abundances of a defined set of transcripts via their <a href="Nucleic_acid_hybridization" title="Nucleic acid hybridization">hybridisation</a> to an array of <a href="Complementarity_(molecular_biology)" title="Complementarity (molecular biology)">complementary</a> <a href="Molecular_probe" title="Molecular probe">probes</a> were first published in 1995.<sup id="cite_ref-#7569999_34-0" class="reference"><a href="#cite_note-#7569999-34"><span class="cite-bracket">[</span>34<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#17644526_35-0" class="reference"><a href="#cite_note-#17644526-35"><span class="cite-bracket">[</span>35<span class="cite-bracket">]</span></a></sup> Microarray technology allowed the assay of thousands of transcripts simultaneously and at a greatly reduced cost per gene and labour saving.<sup id="cite_ref-pmid12117754_36-0" class="reference"><a href="#cite_note-pmid12117754-36"><span class="cite-bracket">[</span>36<span class="cite-bracket">]</span></a></sup> Both <a href="DNA_microarray#Spotted_vs._in_situ_synthesised_arrays" title="DNA microarray">spotted oligonucleotide arrays</a> and <a href="Affymetrix" title="Affymetrix">Affymetrix</a> high-density arrays were the method of choice for transcriptional profiling until the late 2000s.<sup id="cite_ref-#19715439_12-2" class="reference"><a href="#cite_note-#19715439-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#11287436_33-1" class="reference"><a href="#cite_note-#11287436-33"><span class="cite-bracket">[</span>33<span class="cite-bracket">]</span></a></sup> Over this period, a range of microarrays were produced to cover known genes in <a href="Model_organism" title="Model organism">model</a> or economically important organisms. Advances in design and manufacture of arrays improved the specificity of probes and allowed more genes to be tested on a single array. Advances in <a href="Fluorescence_spectroscopy" title="Fluorescence spectroscopy">fluorescence detection</a> increased the sensitivity and measurement accuracy for low abundance transcripts.<sup id="cite_ref-#17644526_35-1" class="reference"><a href="#cite_note-#17644526-35"><span class="cite-bracket">[</span>35<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-37" class="reference"><a href="#cite_note-37"><span class="cite-bracket">[</span>37<span class="cite-bracket">]</span></a></sup>
</p><p>RNA-Seq is accomplished by reverse transcribing RNA <i>in vitro</i> and sequencing the resulting <a href="Complementary_DNA" title="Complementary DNA">cDNAs</a>.<sup id="cite_ref-#19015660_10-6" class="reference"><a href="#cite_note-#19015660-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> Transcript abundance is derived from the number of counts from each transcript. The technique has therefore been heavily influenced by the development of <a href="DNA_sequencing#High-throughput_methods" title="DNA sequencing">high-throughput sequencing technologies</a>.<sup id="cite_ref-#23290152_9-4" class="reference"><a href="#cite_note-#23290152-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#21191423_11-1" class="reference"><a href="#cite_note-#21191423-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> <a href="Massively_parallel_signature_sequencing" title="Massively parallel signature sequencing">Massively parallel signature sequencing</a> (MPSS) was an early example based on generating 16–20&nbsp;<a href="Base_pair#Length_measurements" title="Base pair">bp</a> sequences via a complex series of <a href="Nucleic_acid_hybridization" title="Nucleic acid hybridization">hybridisations</a>,<sup id="cite_ref-#10835600_38-0" class="reference"><a href="#cite_note-#10835600-38"><span class="cite-bracket">[</span>38<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-39" class="reference"><a href="#cite_note-39"><span class="cite-bracket">[</span>note 1<span class="cite-bracket">]</span></a></sup> and was used in 2004 to validate the expression of ten thousand genes in <i><a href="Arabidopsis_thaliana" title="Arabidopsis thaliana">Arabidopsis thaliana</a></i>.<sup id="cite_ref-#15247925_40-0" class="reference"><a href="#cite_note-#15247925-40"><span class="cite-bracket">[</span>39<span class="cite-bracket">]</span></a></sup> The earliest RNA-Seq work was published in 2006 with one hundred thousand transcripts sequenced using <a href="454_Life_Sciences#Technology" title="454 Life Sciences">454 technology</a>.<sup id="cite_ref-#17010196_41-0" class="reference"><a href="#cite_note-#17010196-41"><span class="cite-bracket">[</span>40<span class="cite-bracket">]</span></a></sup> This was sufficient coverage to quantify relative transcript abundance. RNA-Seq began to increase in popularity after 2008 when new <a href="Illumina_dye_sequencing" title="Illumina dye sequencing">Solexa/Illumina technologies</a> allowed one billion transcript sequences to be recorded.<sup id="cite_ref-#18599741_4-1" class="reference"><a href="#cite_note-#18599741-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#19015660_10-7" class="reference"><a href="#cite_note-#19015660-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#18516045_42-0" class="reference"><a href="#cite_note-#18516045-42"><span class="cite-bracket">[</span>41<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#18488015_43-0" class="reference"><a href="#cite_note-#18488015-43"><span class="cite-bracket">[</span>42<span class="cite-bracket">]</span></a></sup> This yield now allows for the <a href="Quantification_(science)" title="Quantification (science)">quantification</a> and comparison of human transcriptomes.<sup id="cite_ref-44" class="reference"><a href="#cite_note-44"><span class="cite-bracket">[</span>43<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading2"><h2 id="Data_gathering">Data gathering</h2></div>
<p>Generating data on RNA transcripts can be achieved via either of two main principles: sequencing of individual transcripts (<a href="Expressed_sequence_tag" title="Expressed sequence tag">ESTs</a>, or RNA-Seq) or <a href="Nucleic_acid_hybridization" title="Nucleic acid hybridization">hybridisation</a> of transcripts to an ordered array of nucleotide probes (microarrays).<sup id="cite_ref-#25149683_23-5" class="reference"><a href="#cite_note-#25149683-23"><span class="cite-bracket">[</span>23<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading3"><h3 id="Isolation_of_RNA">Isolation of RNA</h3></div>
<p>All transcriptomic methods require RNA to first be isolated from the experimental organism before transcripts can be recorded. Although biological systems are incredibly diverse, <a href="RNA_extraction" title="RNA extraction">RNA extraction</a> techniques are broadly similar and involve mechanical <a href="Cell_disruption" title="Cell disruption">disruption of cells</a> or tissues, disruption of <a href="RNAse" class="mw-redirect" title="RNAse">RNase</a> with <a href="Chaotropic_agent" title="Chaotropic agent">chaotropic salts</a>,<sup id="cite_ref-#2440339_45-0" class="reference"><a href="#cite_note-#2440339-45"><span class="cite-bracket">[</span>44<span class="cite-bracket">]</span></a></sup> disruption of macromolecules and nucleotide complexes, separation of RNA from undesired <a href="Biomolecule" title="Biomolecule">biomolecules</a> including DNA, and concentration of the RNA via <a href="Ethanol_precipitation" title="Ethanol precipitation">precipitation</a> from solution or <a href="Spin_column-based_nucleic_acid_purification" title="Spin column-based nucleic acid purification">elution from a solid matrix</a>.<sup id="cite_ref-#2440339_45-1" class="reference"><a href="#cite_note-#2440339-45"><span class="cite-bracket">[</span>44<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#17406285_46-0" class="reference"><a href="#cite_note-#17406285-46"><span class="cite-bracket">[</span>45<span class="cite-bracket">]</span></a></sup> Isolated RNA may additionally be treated with <a href="DNAse" class="mw-redirect" title="DNAse">DNase</a> to digest any traces of DNA.<sup id="cite_ref-#1699561_47-0" class="reference"><a href="#cite_note-#1699561-47"><span class="cite-bracket">[</span>46<span class="cite-bracket">]</span></a></sup> It is necessary to enrich messenger RNA as total RNA extracts are typically 98% <a href="Ribosomal_RNA" title="Ribosomal RNA">ribosomal RNA</a>.<sup id="cite_ref-#9664454_48-0" class="reference"><a href="#cite_note-#9664454-48"><span class="cite-bracket">[</span>47<span class="cite-bracket">]</span></a></sup> Enrichment for transcripts can be performed by <a href="Polyadenylation" title="Polyadenylation">poly-A</a> affinity methods or by depletion of ribosomal RNA using sequence-specific probes.<sup id="cite_ref-#24888378_49-0" class="reference"><a href="#cite_note-#24888378-49"><span class="cite-bracket">[</span>48<span class="cite-bracket">]</span></a></sup> Degraded RNA may affect downstream results; for example, mRNA enrichment from degraded samples will result in the depletion of <a href="5'_end" class="mw-redirect" title="5' end">5’ mRNA ends</a> and an uneven signal across the length of a transcript. <a href="Snap_freezing#Scientific_use" title="Snap freezing">Snap-freezing</a> of tissue prior to RNA isolation is typical, and care is taken to reduce exposure to RNase enzymes once isolation is complete.<sup id="cite_ref-#17406285_46-1" class="reference"><a href="#cite_note-#17406285-46"><span class="cite-bracket">[</span>45<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading3"><h3 id="Expressed_sequence_tags">Expressed sequence tags</h3></div>
<p>An <a href="Expressed_sequence_tag" title="Expressed sequence tag">expressed sequence tag</a> (EST) is a short nucleotide sequence generated from a single RNA transcript. RNA is first copied as <a href="Complementary_DNA" title="Complementary DNA">complementary DNA</a> (cDNA) by a <a href="Reverse_transcriptase" title="Reverse transcriptase">reverse transcriptase</a> enzyme before the resultant cDNA is sequenced.<sup id="cite_ref-#9448457_16-2" class="reference"><a href="#cite_note-#9448457-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup> Because ESTs can be collected without prior knowledge of the organism from which they come, they can be made from mixtures of organisms or environmental samples.<sup id="cite_ref-50" class="reference"><a href="#cite_note-50"><span class="cite-bracket">[</span>49<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#9448457_16-3" class="reference"><a href="#cite_note-#9448457-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup> Although higher-throughput methods are now used, <a href="CDNA_library" title="CDNA library">EST libraries</a> commonly provided sequence information for early microarray designs; for example, a <a href="Hordeum_vulgare" class="mw-redirect" title="Hordeum vulgare">barley</a> microarray was designed from 350,000 previously sequenced ESTs.<sup id="cite_ref-#15020760_51-0" class="reference"><a href="#cite_note-#15020760-51"><span class="cite-bracket">[</span>50<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading3"><h3 id="Serial_and_cap_analysis_of_gene_expression_(SAGE/CAGE)">Serial and cap analysis of gene expression (SAGE/CAGE)</h3></div>

<p><a href="Serial_analysis_of_gene_expression" title="Serial analysis of gene expression">Serial analysis of gene expression</a> (SAGE) was a development of EST methodology to increase the throughput of the tags generated and allow some quantitation of transcript abundance.<sup id="cite_ref-#7570003_21-1" class="reference"><a href="#cite_note-#7570003-21"><span class="cite-bracket">[</span>21<span class="cite-bracket">]</span></a></sup> <a href="Complementary_DNA" title="Complementary DNA">cDNA</a> is generated from the <a href="RNA" title="RNA">RNA</a> but is then digested into 11&nbsp;bp "tag" fragments using <a href="Restriction_enzyme" title="Restriction enzyme">restriction enzymes</a> that cut DNA at a specific sequence, and 11&nbsp;base pairs along from that sequence. These cDNA tags are then <a href="Ligation_(molecular_biology)" title="Ligation (molecular biology)">joined</a> head-to-tail into long strands (&gt;500&nbsp;bp) and sequenced using low-throughput, but long read-length methods such as <a href="Sanger_sequencing" title="Sanger sequencing">Sanger sequencing</a>. The sequences are then divided back into their original 11 bp tags using computer software in a process called <a href="Deconvolution" title="Deconvolution">deconvolution</a>.<sup id="cite_ref-#7570003_21-2" class="reference"><a href="#cite_note-#7570003-21"><span class="cite-bracket">[</span>21<span class="cite-bracket">]</span></a></sup> If a high-quality <a href="Reference_genome" title="Reference genome">reference genome</a> is available, these tags may be matched to their corresponding gene in the genome. If a reference genome is unavailable, the tags can be directly used as diagnostic markers if found to be <a href="Gene_expression_profiling" title="Gene expression profiling">differentially expressed</a> in a disease state.<sup id="cite_ref-#7570003_21-3" class="reference"><a href="#cite_note-#7570003-21"><span class="cite-bracket">[</span>21<span class="cite-bracket">]</span></a></sup>
</p><p>The <a href="Cap_analysis_gene_expression" class="mw-redirect" title="Cap analysis gene expression">cap analysis gene expression</a> (CAGE) method is a variant of SAGE that sequences tags from the <a href="5%E2%80%99_end" class="mw-redirect" title="5’ end">5’ end</a> of an mRNA transcript only.<sup id="cite_ref-#14663149_53-0" class="reference"><a href="#cite_note-#14663149-53"><span class="cite-bracket">[</span>52<span class="cite-bracket">]</span></a></sup> Therefore, the <a href="Transcription_(genetics)" class="mw-redirect" title="Transcription (genetics)">transcriptional start site</a> of genes can be identified when the tags are aligned to a reference genome. Identifying gene start sites is of use for <a href="Promoter_(genetics)" title="Promoter (genetics)">promoter</a> analysis and for the <a href="Molecular_cloning" title="Molecular cloning">cloning</a> of full-length cDNAs.
</p><p>SAGE and CAGE methods produce information on more genes than was possible when sequencing single ESTs, but sample preparation and data analysis are typically more labour-intensive.<sup id="cite_ref-#14663149_53-1" class="reference"><a href="#cite_note-#14663149-53"><span class="cite-bracket">[</span>52<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading3"><h3 id="Microarrays">Microarrays</h3></div>

<div class="mw-heading mw-heading4"><h4 id="Principles_and_advances">Principles and advances</h4></div>
<p><a href="Microarray" title="Microarray">Microarrays</a> usually consist of a grid of short nucleotide <a href="Oligonucleotide" title="Oligonucleotide">oligomers</a>, known as "<a href="Molecular_probe" title="Molecular probe">probes</a>", typically arranged on a glass slide.<sup id="cite_ref-pmid24479125_54-0" class="reference"><a href="#cite_note-pmid24479125-54"><span class="cite-bracket">[</span>53<span class="cite-bracket">]</span></a></sup> Transcript abundance is determined by hybridisation of <a href="Fluorescence" title="Fluorescence">fluorescently</a> labelled transcripts to these probes.<sup id="cite_ref-#17095434_55-0" class="reference"><a href="#cite_note-#17095434-55"><span class="cite-bracket">[</span>54<span class="cite-bracket">]</span></a></sup> The <a href="Fluorometer" title="Fluorometer">fluorescence intensity</a> at each probe location on the array indicates the transcript abundance for that probe sequence.<sup id="cite_ref-#17095434_55-1" class="reference"><a href="#cite_note-#17095434-55"><span class="cite-bracket">[</span>54<span class="cite-bracket">]</span></a></sup> Groups of probes designed to measure the same transcript (i.e., hybridizing a specific transcript in different positions) are usually referred to as "probesets".
</p><p>Microarrays require some genomic knowledge from the organism of interest, for example, in the form of an <a href="DNA_annotation" title="DNA annotation">annotated</a> <a href="Genome" title="Genome">genome</a> sequence, or a <a href="Library_(biology)" title="Library (biology)">library</a> of ESTs that can be used to generate the probes for the array.<sup id="cite_ref-pmid12117754_36-1" class="reference"><a href="#cite_note-pmid12117754-36"><span class="cite-bracket">[</span>36<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading4"><h4 id="Methods">Methods</h4></div>
<p>Microarrays for transcriptomics typically fall into one of two broad categories: low-density spotted arrays or high-density short probe arrays. Transcript abundance is inferred from the intensity of fluorescence derived from fluorophore-tagged transcripts that bind to the array.<sup id="cite_ref-pmid12117754_36-2" class="reference"><a href="#cite_note-pmid12117754-36"><span class="cite-bracket">[</span>36<span class="cite-bracket">]</span></a></sup>
</p><p>Spotted low-density arrays typically feature <a href="Litre#SI_prefixes_applied_to_the_litre" title="Litre">picolitre</a><sup id="cite_ref-56" class="reference"><a href="#cite_note-56"><span class="cite-bracket">[</span>note 2<span class="cite-bracket">]</span></a></sup> drops of a range of purified <a href="Complementary_DNA" title="Complementary DNA">cDNAs</a> arrayed on the surface of a glass slide.<sup id="cite_ref-#15978318_57-0" class="reference"><a href="#cite_note-#15978318-57"><span class="cite-bracket">[</span>55<span class="cite-bracket">]</span></a></sup> These probes are longer than those of high-density arrays and cannot identify <a href="Alternative_splicing" title="Alternative splicing">alternative splicing</a> events. Spotted arrays use two different <a href="Fluorophore" title="Fluorophore">fluorophores</a> to label the test and control samples, and the ratio of fluorescence is used to calculate a relative measure of abundance.<sup id="cite_ref-#8796352_58-0" class="reference"><a href="#cite_note-#8796352-58"><span class="cite-bracket">[</span>56<span class="cite-bracket">]</span></a></sup> High-density arrays use a single fluorescent label, and each sample is hybridised and detected individually.<sup id="cite_ref-#9634850_59-0" class="reference"><a href="#cite_note-#9634850-59"><span class="cite-bracket">[</span>57<span class="cite-bracket">]</span></a></sup> High-density arrays were popularised by the <a href="Affymetrix" title="Affymetrix">Affymetrix GeneChip</a> array, where each transcript is quantified by several short 25<a href="Oligomer" title="Oligomer">-mer</a> probes that together <a href="Reporter_gene#Gene_expression_assays" title="Reporter gene">assay</a> one gene.<sup id="cite_ref-#12582260_60-0" class="reference"><a href="#cite_note-#12582260-60"><span class="cite-bracket">[</span>58<span class="cite-bracket">]</span></a></sup>
</p><p>NimbleGen arrays were a high-density array produced by a <a href="Maskless_lithography" title="Maskless lithography">maskless-photochemistry</a> method, which permitted flexible manufacture of arrays in small or large numbers. These arrays had 100,000s of 45 to 85-mer probes and were hybridised with a one-colour labelled sample for expression analysis.<sup id="cite_ref-#16075461_61-0" class="reference"><a href="#cite_note-#16075461-61"><span class="cite-bracket">[</span>59<span class="cite-bracket">]</span></a></sup> Some designs incorporated up to 12 independent arrays per slide.
</p>
<div class="mw-heading mw-heading3"><h3 id="RNA-Seq">RNA-Seq</h3></div>

<div class="mw-heading mw-heading4"><h4 id="Principles_and_advances_2">Principles and advances</h4></div>
<p><a href="RNA-Seq" title="RNA-Seq">RNA-Seq</a> refers to the combination of a <a href="DNA_sequencing#High-throughput_methods" title="DNA sequencing">high-throughput sequencing</a> methodology with computational methods to capture and quantify transcripts present in an RNA extract.<sup id="cite_ref-#19015660_10-8" class="reference"><a href="#cite_note-#19015660-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> The nucleotide sequences generated are typically around 100 bp in length, but can range from 30 bp to over 10,000 bp depending on the sequencing method used. RNA-Seq leverages <a href="Coverage_(genetics)" title="Coverage (genetics)">deep sampling</a> of the transcriptome with many short fragments from a transcriptome to allow computational reconstruction of the original RNA transcript by <a href="Sequence_alignment" title="Sequence alignment">aligning</a> reads to a reference genome or to each other (<a href="De_novo_transcriptome_assembly" title="De novo transcriptome assembly">de novo assembly</a>).<sup id="cite_ref-#23290152_9-5" class="reference"><a href="#cite_note-#23290152-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> Both low-abundance and high-abundance RNAs can be quantified in an RNA-Seq experiment (<a href="Dynamic_range" title="Dynamic range">dynamic range</a> of 5 <a href="Order_of_magnitude" title="Order of magnitude">orders of magnitude</a>)—a key advantage over microarray transcriptomes. In addition, input RNA amounts are much lower for RNA-Seq (nanogram quantity) compared to microarrays (microgram quantity), which allow examination of the transcriptome even at a single-cell resolution when combined with amplification of cDNA.<sup id="cite_ref-#22939981_25-1" class="reference"><a href="#cite_note-#22939981-25"><span class="cite-bracket">[</span>25<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-62" class="reference"><a href="#cite_note-62"><span class="cite-bracket">[</span>60<span class="cite-bracket">]</span></a></sup> Theoretically, there is no upper limit of quantification in RNA-Seq, and background noise is very low for 100 bp reads in non-repetitive regions.<sup id="cite_ref-#19015660_10-9" class="reference"><a href="#cite_note-#19015660-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup>
</p><p>RNA-Seq may be used to identify genes within a <a href="Genome" title="Genome">genome</a>, or identify which genes are active at a particular point in time, and read counts can be used to accurately model the relative gene expression level. RNA-Seq methodology has constantly improved, primarily through the development of DNA sequencing technologies to increase throughput, accuracy, and read length.<sup id="cite_ref-63" class="reference"><a href="#cite_note-63"><span class="cite-bracket">[</span>61<span class="cite-bracket">]</span></a></sup> Since the first descriptions in 2006 and 2008,<sup id="cite_ref-#17010196_41-1" class="reference"><a href="#cite_note-#17010196-41"><span class="cite-bracket">[</span>40<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#18451266_64-0" class="reference"><a href="#cite_note-#18451266-64"><span class="cite-bracket">[</span>62<span class="cite-bracket">]</span></a></sup> RNA-Seq has been rapidly adopted and overtook microarrays as the dominant transcriptomics technique in 2015.<sup id="cite_ref-#25633159_65-0" class="reference"><a href="#cite_note-#25633159-65"><span class="cite-bracket">[</span>63<span class="cite-bracket">]</span></a></sup>
</p><p>The quest for transcriptome data at the level of individual cells has driven advances in RNA-Seq library preparation methods, resulting in dramatic advances in sensitivity. <a href="Single-cell_transcriptomics" title="Single-cell transcriptomics">Single-cell transcriptomes</a> are now well described and have even been extended to <i><a href="In_situ#Biology_and_biomedical_engineering" title="In situ">in situ</a></i> RNA-Seq where transcriptomes of individual cells are directly interrogated in <a href="Fixation_(histology)" title="Fixation (histology)">fixed</a> tissues.<sup id="cite_ref-#24578530_66-0" class="reference"><a href="#cite_note-#24578530-66"><span class="cite-bracket">[</span>64<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading4"><h4 id="Methods_2">Methods</h4></div>
<p>RNA-Seq was established in concert with the rapid development of a range of high-throughput DNA sequencing technologies.<sup id="cite_ref-#18846087_67-0" class="reference"><a href="#cite_note-#18846087-67"><span class="cite-bracket">[</span>65<span class="cite-bracket">]</span></a></sup> However, before the extracted RNA transcripts are sequenced, several key processing steps are performed. Methods differ in the use of transcript enrichment, fragmentation, amplification, single or paired-end sequencing, and whether to preserve strand information.<sup id="cite_ref-#18846087_67-1" class="reference"><a href="#cite_note-#18846087-67"><span class="cite-bracket">[</span>65<span class="cite-bracket">]</span></a></sup>
</p><p>The sensitivity of an RNA-Seq experiment can be increased by enriching classes of RNA that are of interest and depleting known abundant RNAs. The mRNA molecules can be separated using oligonucleotides probes which bind their <a href="Polyadenylation" title="Polyadenylation">poly-A tails</a>. Alternatively, ribo-depletion can be used to specifically remove abundant but uninformative <a href="Ribosomal_RNA" title="Ribosomal RNA">ribosomal RNAs</a> (rRNAs) by hybridisation to probes tailored to the <a href="Taxon" title="Taxon">taxon's</a> specific rRNA sequences (e.g. mammal rRNA, plant rRNA). However, ribo-depletion can also introduce some bias via non-specific depletion of off-target transcripts.<sup id="cite_ref-#24981968_68-0" class="reference"><a href="#cite_note-#24981968-68"><span class="cite-bracket">[</span>66<span class="cite-bracket">]</span></a></sup> Small RNAs, such as <a href="Micro_RNA" class="mw-redirect" title="Micro RNA">micro RNAs</a>, can be purified based on their size by <a href="Gel_electrophoresis" title="Gel electrophoresis">gel electrophoresis</a> and extraction.
</p><p>Since mRNAs are longer than the read-lengths of typical high-throughput sequencing methods, transcripts are usually fragmented prior to sequencing.<sup id="cite_ref-#22140562_69-0" class="reference"><a href="#cite_note-#22140562-69"><span class="cite-bracket">[</span>67<span class="cite-bracket">]</span></a></sup> The fragmentation method is a key aspect of sequencing library construction. <a href="DNA_fragmentation" title="DNA fragmentation">Fragmentation</a> may be achieved by <a href="Hydrolysis" title="Hydrolysis">chemical hydrolysis</a>, <a href="Atomizer_nozzle" class="mw-redirect" title="Atomizer nozzle">nebulisation</a>, <a href="Sonication" title="Sonication">sonication</a>, or <a href="Reverse_transcriptase" title="Reverse transcriptase">reverse transcription</a> with <a href="DNA_sequencing#Chain-termination_methods" title="DNA sequencing">chain-terminating nucleotides</a>.<sup id="cite_ref-#22140562_69-1" class="reference"><a href="#cite_note-#22140562-69"><span class="cite-bracket">[</span>67<span class="cite-bracket">]</span></a></sup> Alternatively, fragmentation and cDNA tagging may be done simultaneously by using <a href="Transposase" title="Transposase">transposase enzymes</a>.<sup id="cite_ref-70" class="reference"><a href="#cite_note-70"><span class="cite-bracket">[</span>68<span class="cite-bracket">]</span></a></sup>
</p><p>During preparation for sequencing, cDNA copies of transcripts may be amplified by <a href="Polymerase_chain_reaction" title="Polymerase chain reaction">PCR</a> to enrich for fragments that contain the expected 5’ and 3’ adapter sequences.<sup id="cite_ref-#27156886_71-0" class="reference"><a href="#cite_note-#27156886-71"><span class="cite-bracket">[</span>69<span class="cite-bracket">]</span></a></sup> Amplification is also used to allow sequencing of very low input amounts of RNA, down to as little as 50 <a href="Orders_of_magnitude_(mass)#picogram" title="Orders of magnitude (mass)">pg</a> in extreme applications.<sup id="cite_ref-#25649271_72-0" class="reference"><a href="#cite_note-#25649271-72"><span class="cite-bracket">[</span>70<span class="cite-bracket">]</span></a></sup> <a href="RNA_spike-in" title="RNA spike-in">Spike-in controls</a> of known RNAs can be used for quality control assessment to check library preparation and sequencing, in terms of <a href="GC-content" title="GC-content">GC-content</a>, fragment length, as well as the bias due to fragment position within a transcript.<sup id="cite_ref-#21816910_73-0" class="reference"><a href="#cite_note-#21816910-73"><span class="cite-bracket">[</span>71<span class="cite-bracket">]</span></a></sup> <a href="Unique_molecular_identifiers" class="mw-redirect" title="Unique molecular identifiers">Unique molecular identifiers</a> (UMIs) are short random sequences that are used to individually tag sequence fragments during library preparation so that every tagged fragment is unique.<sup id="cite_ref-#22101854_74-0" class="reference"><a href="#cite_note-#22101854-74"><span class="cite-bracket">[</span>72<span class="cite-bracket">]</span></a></sup> UMIs provide an absolute scale for quantification, the opportunity to correct for subsequent amplification bias introduced during library construction, and accurately estimate the initial sample size. UMIs are particularly well-suited to single-cell RNA-Seq transcriptomics, where the amount of input RNA is restricted and extended amplification of the sample is required.<sup id="cite_ref-#19349980_75-0" class="reference"><a href="#cite_note-#19349980-75"><span class="cite-bracket">[</span>73<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#24363023_76-0" class="reference"><a href="#cite_note-#24363023-76"><span class="cite-bracket">[</span>74<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#24531970_77-0" class="reference"><a href="#cite_note-#24531970-77"><span class="cite-bracket">[</span>75<span class="cite-bracket">]</span></a></sup>
</p><p>Once the transcript molecules have been prepared they can be sequenced in just one direction (single-end) or both directions (paired-end). A single-end sequence is usually quicker to produce, cheaper than paired-end sequencing and sufficient for quantification of gene expression levels. Paired-end sequencing produces more robust alignments/assemblies, which is beneficial for gene annotation and transcript <a href="Protein_isoform" title="Protein isoform">isoform</a> discovery.<sup id="cite_ref-#19015660_10-10" class="reference"><a href="#cite_note-#19015660-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> Strand-specific RNA-Seq methods preserve the <a href="Directionality_(molecular_biology)" title="Directionality (molecular biology)">strand</a> information of a sequenced transcript.<sup id="cite_ref-#20711195_78-0" class="reference"><a href="#cite_note-#20711195-78"><span class="cite-bracket">[</span>76<span class="cite-bracket">]</span></a></sup> Without strand information, reads can be aligned to a gene locus but do not inform in which direction the gene is transcribed. Stranded-RNA-Seq is useful for deciphering transcription for <a href="Overlapping_gene" title="Overlapping gene">genes that overlap</a> in different directions and to make more robust gene predictions in non-model organisms.<sup id="cite_ref-#20711195_78-1" class="reference"><a href="#cite_note-#20711195-78"><span class="cite-bracket">[</span>76<span class="cite-bracket">]</span></a></sup>
</p>
<table class="wikitable sortable">
<caption><b>Sequencing technology platforms commonly used for RNA-Seq</b><sup id="cite_ref-#22827831_79-0" class="reference"><a href="#cite_note-#22827831-79"><span class="cite-bracket">[</span>77<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#22829749_80-0" class="reference"><a href="#cite_note-#22829749-80"><span class="cite-bracket">[</span>78<span class="cite-bracket">]</span></a></sup>
</caption>
<tbody><tr>
<th>Platform
</th>
<th>Commercial release
</th>
<th>Typical read length
</th>
<th>Maximum throughput per run
</th>
<th>Single read accuracy
</th>
<th style="width:190px"><b>RNA-Seq runs deposited in the NCBI SRA (Oct 2016)</b><sup id="cite_ref-81" class="reference"><a href="#cite_note-81"><span class="cite-bracket">[</span>79<span class="cite-bracket">]</span></a></sup>
</th></tr>
<tr>
<td><a href="454_Life_Sciences" title="454 Life Sciences">454 Life Sciences</a>
</td>
<td>2005
</td>
<td>700 bp
</td>
<td>0.7 Gbp
</td>
<td>99.9%
</td>
<td>3548
</td></tr>
<tr>
<td><a href="Illumina_dye_sequencing" title="Illumina dye sequencing">Illumina</a>
</td>
<td>2006
</td>
<td>50–300 bp
</td>
<td>900 Gbp
</td>
<td>99.9%
</td>
<td>362903
</td></tr>
<tr>
<td><a href="ABI_Solid_Sequencing" title="ABI Solid Sequencing">SOLiD</a>
</td>
<td>2008
</td>
<td>50 bp
</td>
<td>320 Gbp
</td>
<td>99.9%
</td>
<td>7032
</td></tr>
<tr>
<td><a href="Ion_semiconductor_sequencing" title="Ion semiconductor sequencing">Ion Torrent</a>
</td>
<td>2010
</td>
<td>400 bp
</td>
<td>30 Gbp
</td>
<td>98%
</td>
<td>1953
</td></tr>
<tr>
<td><a href="Pacific_Biosciences" title="Pacific Biosciences">PacBio</a>
</td>
<td>2011
</td>
<td>10,000 bp
</td>
<td>2 Gbp
</td>
<td>87%
</td>
<td>160
</td></tr></tbody></table>
<p><small>Legend: NCBI SRA – National center for biotechnology information sequence read archive.</small>
</p><p>Currently RNA-Seq relies on copying RNA molecules into cDNA molecules prior to sequencing; therefore, the subsequent platforms are the same for transcriptomic and genomic data. Consequently, the development of DNA sequencing technologies has been a defining feature of RNA-Seq.<sup id="cite_ref-#22829749_80-1" class="reference"><a href="#cite_note-#22829749-80"><span class="cite-bracket">[</span>78<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#22522955_82-0" class="reference"><a href="#cite_note-#22522955-82"><span class="cite-bracket">[</span>80<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#27184599_83-0" class="reference"><a href="#cite_note-#27184599-83"><span class="cite-bracket">[</span>81<span class="cite-bracket">]</span></a></sup> Direct sequencing of RNA using <a href="Nanopore_sequencing" title="Nanopore sequencing">nanopore sequencing</a> represents a current state-of-the-art RNA-Seq technique.<sup id="cite_ref-84" class="reference"><a href="#cite_note-84"><span class="cite-bracket">[</span>82<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#26076426_85-0" class="reference"><a href="#cite_note-#26076426-85"><span class="cite-bracket">[</span>83<span class="cite-bracket">]</span></a></sup> Nanopore sequencing of RNA can detect <a href="RNA#Structure" title="RNA">modified bases</a> that would be otherwise masked when sequencing cDNA and also eliminates <a href="DNA_replication" title="DNA replication">amplification</a> steps that can otherwise introduce bias.<sup id="cite_ref-#21191423_11-2" class="reference"><a href="#cite_note-#21191423-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#19776739_86-0" class="reference"><a href="#cite_note-#19776739-86"><span class="cite-bracket">[</span>84<span class="cite-bracket">]</span></a></sup>
</p><p>The sensitivity and accuracy of an RNA-Seq experiment are dependent on the <a href="Sequencing_depth" class="mw-redirect" title="Sequencing depth">number of reads</a> obtained from each sample.<sup id="cite_ref-#23961961_87-0" class="reference"><a href="#cite_note-#23961961-87"><span class="cite-bracket">[</span>85<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#26813401_88-0" class="reference"><a href="#cite_note-#26813401-88"><span class="cite-bracket">[</span>86<span class="cite-bracket">]</span></a></sup> A large number of reads are needed to ensure sufficient coverage of the transcriptome, enabling detection of low abundance transcripts. Experimental design is further complicated by sequencing technologies with a limited output range, the variable efficiency of sequence creation, and variable sequence quality. Added to those considerations is that every species has a different <a href="Number_of_genes" class="mw-redirect" title="Number of genes">number of genes</a> and therefore requires a tailored sequence yield for an effective transcriptome. Early studies determined suitable thresholds empirically, but as the technology matured suitable coverage was predicted computationally by transcriptome saturation. Somewhat counter-intuitively, the most effective way to improve detection of differential expression in low expression genes is to add more <a href="Replicate_(biology)" title="Replicate (biology)">biological replicates</a> rather than adding more reads.<sup id="cite_ref-#24020486_89-0" class="reference"><a href="#cite_note-#24020486-89"><span class="cite-bracket">[</span>87<span class="cite-bracket">]</span></a></sup> The current benchmarks recommended by the <a href="Encyclopedia_of_DNA_Elements" class="mw-redirect" title="Encyclopedia of DNA Elements">Encyclopedia of DNA Elements</a> (ENCODE) Project are for 70-fold exome coverage for standard RNA-Seq and up to 500-fold exome coverage to detect rare transcripts and isoforms.<sup id="cite_ref-pmid22955616_90-0" class="reference"><a href="#cite_note-pmid22955616-90"><span class="cite-bracket">[</span>88<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#26527727_91-0" class="reference"><a href="#cite_note-#26527727-91"><span class="cite-bracket">[</span>89<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-92" class="reference"><a href="#cite_note-92"><span class="cite-bracket">[</span>90<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading2"><h2 id="Data_analysis">Data analysis</h2></div>
<p>Transcriptomics methods are highly parallel and require significant computation to produce meaningful data for both microarray and RNA-Seq experiments.<sup id="cite_ref-Thind_93-0" class="reference"><a href="#cite_note-Thind-93"><span class="cite-bracket">[</span>91<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#25605792_94-0" class="reference"><a href="#cite_note-#25605792-94"><span class="cite-bracket">[</span>92<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#19910308_95-0" class="reference"><a href="#cite_note-#19910308-95"><span class="cite-bracket">[</span>93<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#25633503_96-0" class="reference"><a href="#cite_note-#25633503-96"><span class="cite-bracket">[</span>94<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-97" class="reference"><a href="#cite_note-97"><span class="cite-bracket">[</span>95<span class="cite-bracket">]</span></a></sup> Microarray data is recorded as <a href="Image_resolution" title="Image resolution">high-resolution</a> images, requiring <a href="Feature_detection_(computer_vision)" class="mw-redirect" title="Feature detection (computer vision)">feature detection</a> and spectral analysis.<sup id="cite_ref-98" class="reference"><a href="#cite_note-98"><span class="cite-bracket">[</span>96<span class="cite-bracket">]</span></a></sup> Microarray raw image files are each about 750 MB in size, while the processed intensities are around 60 MB in size. Multiple short probes matching a single transcript can reveal details about the <a href="Intron" title="Intron">intron</a>-<a href="Exon" title="Exon">exon</a> structure, requiring statistical models to determine the authenticity of the resulting signal. RNA-Seq studies produce billions of short DNA sequences, which must be aligned to <a href="Reference_genome" title="Reference genome">reference genomes</a> composed of millions to billions of base pairs. <a href="De_novo_transcriptome_assembly" title="De novo transcriptome assembly"><i>De novo</i> assembly of reads</a> within a dataset requires the construction of highly complex <a href="Sequence_graph" title="Sequence graph">sequence graphs</a>.<sup id="cite_ref-#23845962_99-0" class="reference"><a href="#cite_note-#23845962-99"><span class="cite-bracket">[</span>97<span class="cite-bracket">]</span></a></sup> RNA-Seq operations are highly repetitious and benefit from <a href="Parallel_computing" title="Parallel computing">parallelised computation</a> but modern algorithms mean consumer computing hardware is sufficient for simple transcriptomics experiments that do not require <i>de novo</i> assembly of reads.<sup id="cite_ref-Pertea_2015_100-0" class="reference"><a href="#cite_note-Pertea_2015-100"><span class="cite-bracket">[</span>98<span class="cite-bracket">]</span></a></sup> A human transcriptome could be accurately captured using RNA-Seq with 30 million 100 bp sequences per sample.<sup id="cite_ref-#23961961_87-1" class="reference"><a href="#cite_note-#23961961-87"><span class="cite-bracket">[</span>85<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#26813401_88-1" class="reference"><a href="#cite_note-#26813401-88"><span class="cite-bracket">[</span>86<span class="cite-bracket">]</span></a></sup> This example would require approximately 1.8 gigabytes of disk space per sample when stored in a compressed <a href="FASTQ_format" title="FASTQ format">fastq format</a>. Processed count data for each gene would be much smaller, equivalent to processed microarray intensities. Sequence data may be stored in public repositories, such as the <a href="Sequence_Read_Archive" title="Sequence Read Archive">Sequence Read Archive</a> (SRA).<sup id="cite_ref-#22009675_101-0" class="reference"><a href="#cite_note-#22009675-101"><span class="cite-bracket">[</span>99<span class="cite-bracket">]</span></a></sup> RNA-Seq datasets can be uploaded via the Gene Expression Omnibus.<sup id="cite_ref-#11752295_102-0" class="reference"><a href="#cite_note-#11752295-102"><span class="cite-bracket">[</span>100<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading3"><h3 id="Image_processing">Image processing</h3></div>

<p>Microarray <a href="Image_processing" class="mw-redirect" title="Image processing">image processing</a> must correctly identify the <a href="Regular_grid" title="Regular grid">regular grid</a> of features within an image and independently quantify the fluorescence <a href="Luminous_intensity" title="Luminous intensity">intensity</a> for each feature. <a href="Visual_artefact" class="mw-redirect" title="Visual artefact">Image artefacts</a> must be additionally identified and removed from the overall analysis. Fluorescence intensities directly indicate the abundance of each sequence, since the sequence of each probe on the array is already known.<sup id="cite_ref-PetrovShams2004_104-0" class="reference"><a href="#cite_note-PetrovShams2004-104"><span class="cite-bracket">[</span>102<span class="cite-bracket">]</span></a></sup>
</p><p>The first steps of RNA-seq also include similar image processing; however, conversion of images to sequence data is typically handled automatically by the instrument software. The Illumina sequencing-by-synthesis method results in an array of clusters distributed over the surface of a flow cell.<sup id="cite_ref-105" class="reference"><a href="#cite_note-105"><span class="cite-bracket">[</span>103<span class="cite-bracket">]</span></a></sup> The flow cell is imaged up to four times during each sequencing cycle, with tens to hundreds of cycles in total. Flow cell clusters are analogous to microarray spots and must be correctly identified during the early stages of the sequencing process. In <a href="Roche_Diagnostics" class="mw-redirect" title="Roche Diagnostics">Roche</a>’s <a href="Pyrosequencing" title="Pyrosequencing">pyrosequencing</a> method, the intensity of emitted light determines the number of consecutive nucleotides in a homopolymer repeat. There are many variants on these methods, each with a different error profile for the resulting data.<sup id="cite_ref-#21576222_106-0" class="reference"><a href="#cite_note-#21576222-106"><span class="cite-bracket">[</span>104<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading3"><h3 id="RNA-Seq_data_analysis">RNA-Seq data analysis</h3></div>
<p>RNA-Seq experiments generate a large volume of raw sequence reads which have to be processed to yield useful information. Data analysis usually requires a combination of <a href="List_of_open-source_bioinformatics_software" title="List of open-source bioinformatics software">bioinformatics software</a> tools (see also <a href="List_of_RNA-Seq_bioinformatics_tools" title="List of RNA-Seq bioinformatics tools">List of RNA-Seq bioinformatics tools</a>) that vary according to the experimental design and goals. The process can be broken down into four stages: quality control, alignment, quantification, and differential expression.<sup id="cite_ref-#23481128_107-0" class="reference"><a href="#cite_note-#23481128-107"><span class="cite-bracket">[</span>105<span class="cite-bracket">]</span></a></sup> Most popular RNA-Seq programs are run from a <a href="Command-line_interface" title="Command-line interface">command-line interface</a>, either in a <a href="Unix" title="Unix">Unix</a> environment or within the <a href="R_(programming_language)" title="R (programming language)">R</a>/<a href="Bioconductor" title="Bioconductor">Bioconductor</a> statistical environment.<sup id="cite_ref-#25633503_96-1" class="reference"><a href="#cite_note-#25633503-96"><span class="cite-bracket">[</span>94<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading4"><h4 id="Quality_control">Quality control</h4></div>
<p>Sequence reads are not perfect, so the accuracy of each base in the sequence needs to be estimated for downstream analyses. Raw data is examined to ensure: quality scores for base calls are high, the GC content matches the expected distribution, short sequence motifs (<a href="K-mers" class="mw-redirect" title="K-mers">k-mers</a>) are not over-represented, and the read duplication rate is acceptably low.<sup id="cite_ref-#26813401_88-2" class="reference"><a href="#cite_note-#26813401-88"><span class="cite-bracket">[</span>86<span class="cite-bracket">]</span></a></sup> Several software options exist for sequence quality analysis, including FastQC and FaQCs.<sup id="cite_ref-108" class="reference"><a href="#cite_note-108"><span class="cite-bracket">[</span>106<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#25408143_109-0" class="reference"><a href="#cite_note-#25408143-109"><span class="cite-bracket">[</span>107<span class="cite-bracket">]</span></a></sup> Abnormalities may be removed (trimming) or tagged for special treatment during later processes.
</p>
<div class="mw-heading mw-heading4"><h4 id="Alignment">Alignment</h4></div>
<p>In order to link sequence read abundance to the expression of a particular gene, transcript sequences are <a href="Sequence_alignment" title="Sequence alignment">aligned</a> to a reference genome or <a href="De_novo_transcriptome_assembly" title="De novo transcriptome assembly"><i>de novo</i> aligned</a> to one another if no reference is available.<sup id="cite_ref-#23222703_110-0" class="reference"><a href="#cite_note-#23222703-110"><span class="cite-bracket">[</span>108<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#24532719_111-0" class="reference"><a href="#cite_note-#24532719-111"><span class="cite-bracket">[</span>109<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-112" class="reference"><a href="#cite_note-112"><span class="cite-bracket">[</span>110<span class="cite-bracket">]</span></a></sup> The key challenges for <a href="List_of_sequence_alignment_software" title="List of sequence alignment software">alignment software</a> include sufficient speed to permit billions of short sequences to be aligned in a meaningful timeframe, flexibility to recognise and deal with intron splicing of eukaryotic mRNA, and correct assignment of reads that map to multiple locations. Software advances have greatly addressed these issues, and increases in sequencing read length reduce the chance of ambiguous read alignments. A list of currently available high-throughput sequence aligners is maintained by the <a href="European_Bioinformatics_Institute" title="European Bioinformatics Institute">EBI</a>.<sup id="cite_ref-113" class="reference"><a href="#cite_note-113"><span class="cite-bracket">[</span>111<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#23060614_114-0" class="reference"><a href="#cite_note-#23060614-114"><span class="cite-bracket">[</span>112<span class="cite-bracket">]</span></a></sup>
</p><p>Alignment of <a href="Primary_transcript" title="Primary transcript">primary transcript mRNA</a> sequences derived from <a href="Eukaryote" title="Eukaryote">eukaryotes</a> to a reference genome requires specialised handling of <a href="Intron" title="Intron">intron</a> sequences, which are absent from mature mRNA.<sup id="cite_ref-115" class="reference"><a href="#cite_note-115"><span class="cite-bracket">[</span>113<span class="cite-bracket">]</span></a></sup> Short read aligners perform an additional round of alignments specifically designed to identify <a href="Splice_junction" class="mw-redirect" title="Splice junction">splice junctions</a>, informed by canonical splice site sequences and known intron splice site information. Identification of intron splice junctions prevents reads from being misaligned across splice junctions or erroneously discarded, allowing more reads to be aligned to the reference genome and improving the accuracy of gene expression estimates. Since <a href="Regulation_of_gene_expression" title="Regulation of gene expression">gene regulation</a> may occur at the <a href="Alternative_splicing" title="Alternative splicing">mRNA isoform</a> level, splice-aware alignments also permit detection of isoform abundance changes that would otherwise be lost in a bulked analysis.<sup id="cite_ref-#20436464_116-0" class="reference"><a href="#cite_note-#20436464-116"><span class="cite-bracket">[</span>114<span class="cite-bracket">]</span></a></sup>
</p><p><i>De novo</i> assembly can be used to align reads to one another to construct full-length transcript sequences without use of a reference genome.<sup id="cite_ref-#20211242_117-0" class="reference"><a href="#cite_note-#20211242-117"><span class="cite-bracket">[</span>115<span class="cite-bracket">]</span></a></sup> Challenges particular to <i>de novo</i> assembly include larger computational requirements compared to a reference-based transcriptome, additional validation of gene variants or fragments, and additional annotation of assembled transcripts. The first metrics used to describe transcriptome assemblies, such as <a href="N50%2C_L50%2C_and_related_statistics" title="N50, L50, and related statistics">N50</a>, have been shown to be misleading<sup id="cite_ref-#23837739_118-0" class="reference"><a href="#cite_note-#23837739-118"><span class="cite-bracket">[</span>116<span class="cite-bracket">]</span></a></sup> and improved evaluation methods are now available.<sup id="cite_ref-#27252236_119-0" class="reference"><a href="#cite_note-#27252236-119"><span class="cite-bracket">[</span>117<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#25608678_120-0" class="reference"><a href="#cite_note-#25608678-120"><span class="cite-bracket">[</span>118<span class="cite-bracket">]</span></a></sup> Annotation-based metrics are better assessments of assembly completeness, such as <a href="Contig" title="Contig">contig</a> reciprocal best hit count. Once assembled <i>de novo</i>, the assembly can be used as a reference for subsequent sequence alignment methods and quantitative gene expression analysis.
</p>
<table class="wikitable sortable">
<caption><b>RNA-Seq <i>de novo</i> assembly software</b>
</caption>
<tbody><tr>
<th><b>Software</b>
</th>
<th><b>Released</b>
</th>
<th><b>Last updated</b>
</th>
<th><b>Computational efficiency</b>
</th>
<th><b>Strengths and weaknesses</b>
</th></tr>
<tr>
<td>Velvet-Oases<sup id="cite_ref-#18349386_121-0" class="reference"><a href="#cite_note-#18349386-121"><span class="cite-bracket">[</span>119<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#22368243_122-0" class="reference"><a href="#cite_note-#22368243-122"><span class="cite-bracket">[</span>120<span class="cite-bracket">]</span></a></sup>
</td>
<td>2008
</td>
<td>2011
</td>
<td>Low, single-threaded, high RAM requirement
</td>
<td>The original short read assembler. It is now largely superseded.
</td></tr>
<tr>
<td>SOAPdenovo-trans<sup id="cite_ref-#24532719_111-1" class="reference"><a href="#cite_note-#24532719-111"><span class="cite-bracket">[</span>109<span class="cite-bracket">]</span></a></sup>
</td>
<td>2011
</td>
<td>2014
</td>
<td>Moderate, multi-thread, medium RAM requirement
</td>
<td>An early example of a short read assembler. It has been updated for transcriptome assembly.
</td></tr>
<tr>
<td>Trans-ABySS<sup id="cite_ref-#20935650_123-0" class="reference"><a href="#cite_note-#20935650-123"><span class="cite-bracket">[</span>121<span class="cite-bracket">]</span></a></sup>
</td>
<td>2010
</td>
<td>2016
</td>
<td>Moderate, multi-thread, medium RAM requirement
</td>
<td>Suited to short reads, can handle complex transcriptomes, and an <a href="Message_Passing_Interface" title="Message Passing Interface">MPI-parallel</a> version is available for computing clusters.
</td></tr>
<tr>
<td>Trinity<sup id="cite_ref-#21572440_124-0" class="reference"><a href="#cite_note-#21572440-124"><span class="cite-bracket">[</span>122<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#23845962_99-1" class="reference"><a href="#cite_note-#23845962-99"><span class="cite-bracket">[</span>97<span class="cite-bracket">]</span></a></sup>
</td>
<td>2011
</td>
<td>2017
</td>
<td>Moderate, multi-thread, medium RAM requirement
</td>
<td>Suited to short reads. It can handle complex transcriptomes but is memory intensive.
</td></tr>
<tr>
<td>miraEST<sup id="cite_ref-#15140833_125-0" class="reference"><a href="#cite_note-#15140833-125"><span class="cite-bracket">[</span>123<span class="cite-bracket">]</span></a></sup>
</td>
<td>1999
</td>
<td>2016
</td>
<td>Moderate, multi-thread, medium RAM requirement
</td>
<td>Can process repetitive sequences, combine different sequencing formats, and a wide range of sequence platforms are accepted.
</td></tr>
<tr>
<td>Newbler<sup id="cite_ref-#16056220_126-0" class="reference"><a href="#cite_note-#16056220-126"><span class="cite-bracket">[</span>124<span class="cite-bracket">]</span></a></sup>
</td>
<td>2004
</td>
<td>2012
</td>
<td>Low, single-thread, high RAM requirement
</td>
<td>Specialised to accommodate the homo-polymer sequencing errors typical of Roche 454 sequencers.
</td></tr>
<tr>
<td>CLC genomics workbench<sup id="cite_ref-#20950480_127-0" class="reference"><a href="#cite_note-#20950480-127"><span class="cite-bracket">[</span>125<span class="cite-bracket">]</span></a></sup>
</td>
<td>2008
</td>
<td>2014
</td>
<td>High, multi-thread, low RAM requirement
</td>
<td>Has a graphical user interface, can combine diverse sequencing technologies, has no transcriptome-specific features, and a licence must be purchased before use.
</td></tr>
<tr>
<td>SPAdes<sup id="cite_ref-128" class="reference"><a href="#cite_note-128"><span class="cite-bracket">[</span>126<span class="cite-bracket">]</span></a></sup>
</td>
<td>2012
</td>
<td>2017
</td>
<td>High, multi-thread, low RAM requirement
</td>
<td>Used for transcriptomics experiments on single cells.
</td></tr>
<tr>
<td>RSEM<sup id="cite_ref-129" class="reference"><a href="#cite_note-129"><span class="cite-bracket">[</span>127<span class="cite-bracket">]</span></a></sup>
</td>
<td>2011
</td>
<td>2017
</td>
<td>High, multi-thread, low RAM requirement
</td>
<td>Can estimate frequency of alternatively spliced transcripts. User friendly.
</td></tr>
<tr>
<td>StringTie<sup id="cite_ref-Pertea_2015_100-1" class="reference"><a href="#cite_note-Pertea_2015-100"><span class="cite-bracket">[</span>98<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-130" class="reference"><a href="#cite_note-130"><span class="cite-bracket">[</span>128<span class="cite-bracket">]</span></a></sup>
</td>
<td>2015
</td>
<td>2019
</td>
<td>High, multi-thread, low RAM requirement
</td>
<td>Can use a combination of reference-guided and <i>de novo</i> assembly methods to identify transcripts.
</td></tr></tbody></table>
<p><small>Legend: RAM – random access memory; MPI – message passing interface; EST – expressed sequence tag.</small>
</p>
<div class="mw-heading mw-heading4"><h4 id="Quantification">Quantification</h4></div>

<p>Quantification of sequence alignments may be performed at the gene, exon, or transcript level.<sup id="cite_ref-Thind_93-1" class="reference"><a href="#cite_note-Thind-93"><span class="cite-bracket">[</span>91<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#24020486_89-1" class="reference"><a href="#cite_note-#24020486-89"><span class="cite-bracket">[</span>87<span class="cite-bracket">]</span></a></sup> Typical outputs include a table of read counts for each feature supplied to the software; for example, for genes in a <a href="General_feature_format" title="General feature format">general feature format</a> file. Gene and exon read counts may be calculated quite easily using HTSeq, for example.<sup id="cite_ref-#25260700_132-0" class="reference"><a href="#cite_note-#25260700-132"><span class="cite-bracket">[</span>130<span class="cite-bracket">]</span></a></sup> Quantitation at the transcript level is more complicated and requires probabilistic methods to estimate transcript isoform abundance from short read information; for example, using cufflinks software.<sup id="cite_ref-#20436464_116-1" class="reference"><a href="#cite_note-#20436464-116"><span class="cite-bracket">[</span>114<span class="cite-bracket">]</span></a></sup> Reads that align equally well to multiple locations must be identified and either removed, aligned to one of the possible locations, or aligned to the most probable location.
</p><p>Some quantification methods can circumvent the need for an exact alignment of a read to a reference sequence altogether. The kallisto software method combines pseudoalignment and quantification into a single step that runs 2 orders of magnitude faster than contemporary methods such as those used by tophat/cufflinks software, with less computational burden.<sup id="cite_ref-#27043002_133-0" class="reference"><a href="#cite_note-#27043002-133"><span class="cite-bracket">[</span>131<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading4"><h4 id="Differential_expression">Differential expression</h4></div>
<p>Once quantitative counts of each transcript are available, <a href="Gene_expression_profiling" title="Gene expression profiling">differential gene expression</a> is measured by normalising, modelling, and statistically analysing the data.<sup id="cite_ref-#23222703_110-1" class="reference"><a href="#cite_note-#23222703-110"><span class="cite-bracket">[</span>108<span class="cite-bracket">]</span></a></sup> Most tools will read a table of genes and read counts as their input, but some programs, such as cuffdiff, will accept <a href="Binary_Alignment_Map" class="mw-redirect" title="Binary Alignment Map">binary alignment map</a> format read alignments as input. The final outputs of these analyses are gene lists with associated pair-wise tests for differential expression between treatments and the probability estimates of those differences.<sup id="cite_ref-134" class="reference"><a href="#cite_note-134"><span class="cite-bracket">[</span>132<span class="cite-bracket">]</span></a></sup>
</p>
<table class="wikitable">
<caption><b>RNA-Seq differential gene expression software</b>
</caption>
<tbody><tr>
<th align="center">Software
</th>
<th align="center">Environment
</th>
<th align="center">Specialisation
</th></tr>
<tr>
<td>Cuffdiff2<sup id="cite_ref-#23222703_110-2" class="reference"><a href="#cite_note-#23222703-110"><span class="cite-bracket">[</span>108<span class="cite-bracket">]</span></a></sup>
</td>
<td>Unix-based
</td>
<td>Transcript analysis that tracks alternative splicing of mRNA
</td></tr>
<tr>
<td>EdgeR<sup id="cite_ref-#19910308_95-1" class="reference"><a href="#cite_note-#19910308-95"><span class="cite-bracket">[</span>93<span class="cite-bracket">]</span></a></sup>
</td>
<td>R/Bioconductor
</td>
<td>Any count-based genomic data
</td></tr>
<tr>
<td>DEseq2<sup id="cite_ref-#25516281_135-0" class="reference"><a href="#cite_note-#25516281-135"><span class="cite-bracket">[</span>133<span class="cite-bracket">]</span></a></sup>
</td>
<td>R/Bioconductor
</td>
<td>Flexible data types, low replication
</td></tr>
<tr>
<td>Limma/Voom<sup id="cite_ref-#25605792_94-1" class="reference"><a href="#cite_note-#25605792-94"><span class="cite-bracket">[</span>92<span class="cite-bracket">]</span></a></sup>
</td>
<td>R/Bioconductor
</td>
<td>Microarray or RNA-Seq data, flexible experiment design
</td></tr>
<tr>
<td>Ballgown<sup id="cite_ref-136" class="reference"><a href="#cite_note-136"><span class="cite-bracket">[</span>134<span class="cite-bracket">]</span></a></sup>
</td>
<td>R/Bioconductor
</td>
<td>Efficient and sensitive transcript discovery, flexible.
</td></tr></tbody></table>
<p><small>Legend: mRNA - messenger RNA.</small>
</p>
<div class="mw-heading mw-heading3"><h3 id="Validation">Validation</h3></div>
<p>Transcriptomic analyses may be validated using an independent technique, for example, <a href="Real-time_polymerase_chain_reaction" title="Real-time polymerase chain reaction">quantitative PCR</a> (qPCR), which is recognisable and statistically assessable.<sup id="cite_ref-#21498551_137-0" class="reference"><a href="#cite_note-#21498551-137"><span class="cite-bracket">[</span>135<span class="cite-bracket">]</span></a></sup> Gene expression is measured against defined standards both for the gene of interest and <a href="Scientific_control" title="Scientific control">control</a> genes. The measurement by qPCR is similar to that obtained by RNA-Seq wherein a value can be calculated for the concentration of a target region in a given sample. qPCR is, however, restricted to <a href="Amplicon" title="Amplicon">amplicons</a> smaller than 300 bp, usually toward the 3’ end of the coding region, avoiding the <a href="3%E2%80%99UTR" class="mw-redirect" title="3’UTR">3’UTR</a>.<sup id="cite_ref-#20011106_138-0" class="reference"><a href="#cite_note-#20011106-138"><span class="cite-bracket">[</span>136<span class="cite-bracket">]</span></a></sup> If validation of transcript isoforms is required, an inspection of RNA-Seq read alignments should indicate where qPCR <a href="Primer_(molecular_biology)#Uses_of_synthetic_primers" title="Primer (molecular biology)">primers</a> might be placed for maximum discrimination. The measurement of multiple control genes along with the genes of interest produces a stable reference within a biological context.<sup id="cite_ref-#12184808_139-0" class="reference"><a href="#cite_note-#12184808-139"><span class="cite-bracket">[</span>137<span class="cite-bracket">]</span></a></sup> qPCR validation of RNA-Seq data has generally shown that different RNA-Seq methods are highly correlated.<sup id="cite_ref-#18451266_64-1" class="reference"><a href="#cite_note-#18451266-64"><span class="cite-bracket">[</span>62<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#19056941_140-0" class="reference"><a href="#cite_note-#19056941-140"><span class="cite-bracket">[</span>138<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#20368969_141-0" class="reference"><a href="#cite_note-#20368969-141"><span class="cite-bracket">[</span>139<span class="cite-bracket">]</span></a></sup>
</p><p>Functional validation of key genes is an important consideration for post transcriptome planning. Observed gene expression patterns may be functionally linked to a <a href="Phenotype" title="Phenotype">phenotype</a> by an independent <a href="Gene_knockdown" title="Gene knockdown">knock-down</a>/<a href="Synthetic_rescue" title="Synthetic rescue">rescue</a> study in the organism of interest.<sup id="cite_ref-Govind_2009_142-0" class="reference"><a href="#cite_note-Govind_2009-142"><span class="cite-bracket">[</span>140<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading2"><h2 id="Applications">Applications</h2></div>
<div class="mw-heading mw-heading3"><h3 id="Diagnostics_and_disease_profiling">Diagnostics and disease profiling</h3></div>
<p>Transcriptomic strategies have seen broad application across diverse areas of biomedical research, including disease <a href="Diagnosis" title="Diagnosis">diagnosis</a> and <a href="Disease" title="Disease">profiling</a>.<sup id="cite_ref-#19015660_10-11" class="reference"><a href="#cite_note-#19015660-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-143" class="reference"><a href="#cite_note-143"><span class="cite-bracket">[</span>141<span class="cite-bracket">]</span></a></sup> RNA-Seq approaches have allowed for the large-scale identification of <a href="Transcriptional_start_sites" class="mw-redirect" title="Transcriptional start sites">transcriptional start sites</a>, uncovered alternative <a href="Promoter_(genetics)" title="Promoter (genetics)">promoter</a> usage, and novel <a href="Alternative_splicing" title="Alternative splicing">splicing alterations</a>. These <a href="Regulatory_sequence" title="Regulatory sequence">regulatory elements</a> are important in human disease and, therefore, defining such variants is crucial to the interpretation of <a href="Genome-wide_association_study" title="Genome-wide association study">disease-association studies</a>.<sup id="cite_ref-#22739340_144-0" class="reference"><a href="#cite_note-#22739340-144"><span class="cite-bracket">[</span>142<span class="cite-bracket">]</span></a></sup> RNA-Seq can also identify disease-associated <a href="Single_nucleotide_polymorphism" class="mw-redirect" title="Single nucleotide polymorphism">single nucleotide polymorphisms</a> (SNPs), allele-specific expression, and <a href="Fusion_gene" title="Fusion gene">gene fusions</a>, which contributes to the understanding of disease causal variants.<sup id="cite_ref-#26781813_145-0" class="reference"><a href="#cite_note-#26781813-145"><span class="cite-bracket">[</span>143<span class="cite-bracket">]</span></a></sup>
</p><p><a href="Retrotransposon" title="Retrotransposon">Retrotransposons</a> are <a href="Transposable_element" title="Transposable element">transposable elements</a> which proliferate within eukaryotic genomes through a process involving <a href="Reverse_transcription" class="mw-redirect" title="Reverse transcription">reverse transcription</a>. RNA-Seq can provide information about the transcription of endogenous retrotransposons that may influence the transcription of neighboring genes by various <a href="Epigenetics#Mechanisms" title="Epigenetics">epigenetic mechanisms</a> that lead to disease.<sup id="cite_ref-#17363976_146-0" class="reference"><a href="#cite_note-#17363976-146"><span class="cite-bracket">[</span>144<span class="cite-bracket">]</span></a></sup> Similarly, the potential for using RNA-Seq to understand <a href="Immune_disorder" title="Immune disorder">immune-related disease</a> is expanding rapidly due to the ability to dissect immune cell populations and to sequence <a href="T_cell_receptor" class="mw-redirect" title="T cell receptor">T cell</a> and <a href="B-cell_receptor" title="B-cell receptor">B cell receptor</a> repertoires from patients.<sup id="cite_ref-#26551575_147-0" class="reference"><a href="#cite_note-#26551575-147"><span class="cite-bracket">[</span>145<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#26996076_148-0" class="reference"><a href="#cite_note-#26996076-148"><span class="cite-bracket">[</span>146<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading3"><h3 id="Human_and_pathogen_transcriptomes">Human and pathogen transcriptomes</h3></div>
<p>RNA-Seq of human <a href="Pathogen" title="Pathogen">pathogens</a> has become an established method for quantifying gene expression changes, identifying novel <a href="Virulence_factors" class="mw-redirect" title="Virulence factors">virulence factors</a>, predicting <a href="Antimicrobial_resistance" title="Antimicrobial resistance">antibiotic resistance</a>, and unveiling <a href="Host%E2%80%93pathogen_interaction" title="Host–pathogen interaction">host-pathogen immune interactions</a>.<sup id="cite_ref-#18284925_149-0" class="reference"><a href="#cite_note-#18284925-149"><span class="cite-bracket">[</span>147<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#25517437_150-0" class="reference"><a href="#cite_note-#25517437-150"><span class="cite-bracket">[</span>148<span class="cite-bracket">]</span></a></sup> A primary aim of this technology is to develop optimised <a href="Infection_control" class="mw-redirect" title="Infection control">infection control</a> measures and targeted <a href="Personalized_medicine" title="Personalized medicine">individualised treatment</a>.<sup id="cite_ref-#26996076_148-1" class="reference"><a href="#cite_note-#26996076-148"><span class="cite-bracket">[</span>146<span class="cite-bracket">]</span></a></sup>
</p><p>Transcriptomic analysis has predominantly focused on either the host or the pathogen. Dual RNA-Seq has been applied to simultaneously profile RNA expression in both the pathogen and host throughout the infection process. This technique enables the study of the dynamic response and interspecies <a href="Gene_regulatory_network" title="Gene regulatory network">gene regulatory networks</a> in both interaction partners from initial contact through to invasion and the final persistence of the pathogen or clearance by the host immune system.<sup id="cite_ref-#22890146_151-0" class="reference"><a href="#cite_note-#22890146-151"><span class="cite-bracket">[</span>149<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#25914674_152-0" class="reference"><a href="#cite_note-#25914674-152"><span class="cite-bracket">[</span>150<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading3"><h3 id="Responses_to_environment">Responses to environment</h3></div>
<p>Transcriptomics allows identification of genes and <a href="Metabolic_pathways" class="mw-redirect" title="Metabolic pathways">pathways</a> that respond to and counteract <a href="Biotic_stress" title="Biotic stress">biotic</a> and <a href="Abiotic_stress" title="Abiotic stress">abiotic environmental stresses.</a><sup id="cite_ref-#26759178_153-0" class="reference"><a href="#cite_note-#26759178-153"><span class="cite-bracket">[</span>151<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Govind_2009_142-1" class="reference"><a href="#cite_note-Govind_2009-142"><span class="cite-bracket">[</span>140<span class="cite-bracket">]</span></a></sup> The non-targeted nature of transcriptomics allows the identification of novel transcriptional networks in complex systems. For example, comparative analysis of a range of <a href="Cicer_arietinum" class="mw-redirect" title="Cicer arietinum">chickpea</a> lines at different developmental stages identified distinct transcriptional profiles associated with <a href="Drought" title="Drought">drought</a> and <a href="Salinity" title="Salinity">salinity</a> stresses, including identifying the role of <a href="Alternative_splicing" title="Alternative splicing">transcript isoforms</a> of <a href="Apetala_2" title="Apetala 2">AP2</a>-<a href="Ethylene-responsive_element_binding_protein" title="Ethylene-responsive element binding protein">EREBP</a>.<sup id="cite_ref-#26759178_153-1" class="reference"><a href="#cite_note-#26759178-153"><span class="cite-bracket">[</span>151<span class="cite-bracket">]</span></a></sup> Investigation of gene expression during <a href="Biofilm" title="Biofilm">biofilm</a> formation by the <a href="Fungus" title="Fungus">fungal</a> pathogen <i><a href="Candida_albicans" title="Candida albicans">Candida albicans</a></i> revealed a co-regulated set of genes critical for biofilm establishment and maintenance.<sup id="cite_ref-#15075282_154-0" class="reference"><a href="#cite_note-#15075282-154"><span class="cite-bracket">[</span>152<span class="cite-bracket">]</span></a></sup>
</p><p>Transcriptomic profiling also provides crucial information on mechanisms of <a href="Drug_resistance" title="Drug resistance">drug resistance</a>. Analysis of over 1000 isolates of <i><a href="Plasmodium_falciparum" title="Plasmodium falciparum">Plasmodium falciparum</a></i>, a virulent parasite responsible for malaria in humans,<sup id="cite_ref-Rich_et_al_155-0" class="reference"><a href="#cite_note-Rich_et_al-155"><span class="cite-bracket">[</span>153<span class="cite-bracket">]</span></a></sup> identified that upregulation of the <a href="Unfolded_protein_response" title="Unfolded protein response">unfolded protein response</a> and slower progression through the early stages of the asexual intraerythrocytic <a href="Plasmodium_falciparum#Life_cycle" title="Plasmodium falciparum">developmental cycle</a> were associated with <a href="Artemisinin#Resistance" title="Artemisinin">artemisinin resistance</a> in isolates from <a href="Southeast_Asia" title="Southeast Asia">Southeast Asia</a>.<sup id="cite_ref-#25502316_156-0" class="reference"><a href="#cite_note-#25502316-156"><span class="cite-bracket">[</span>154<span class="cite-bracket">]</span></a></sup>
</p><p>The use of transcriptomics is also important to investigate responses in the marine environment.<sup id="cite_ref-:0_157-0" class="reference"><a href="#cite_note-:0-157"><span class="cite-bracket">[</span>155<span class="cite-bracket">]</span></a></sup> In marine ecology, "<a href="Stress_(biology)" title="Stress (biology)">stress</a>" and "<a href="Adaptation" title="Adaptation">adaptation</a>" have been among the most common research topics, especially related to anthropogenic stress, such as <a href="Global_change" title="Global change">global change</a> and <a href="Pollution" title="Pollution">pollution</a>.<sup id="cite_ref-:0_157-1" class="reference"><a href="#cite_note-:0-157"><span class="cite-bracket">[</span>155<span class="cite-bracket">]</span></a></sup> Most of the studies in this area have been done in <a href="Animal" title="Animal">animals</a>, although <a href="Invertebrate" title="Invertebrate">invertebrates</a> have been underrepresented.<sup id="cite_ref-:0_157-2" class="reference"><a href="#cite_note-:0-157"><span class="cite-bracket">[</span>155<span class="cite-bracket">]</span></a></sup> One issue still is a deficiency in functional genetic studies, which hamper <a href="Gene_annotation" class="mw-redirect" title="Gene annotation">gene annotations</a>, especially for non-model species, and can lead to vague conclusions on the effects of responses studied.<sup id="cite_ref-:0_157-3" class="reference"><a href="#cite_note-:0-157"><span class="cite-bracket">[</span>155<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading3"><h3 id="Gene_function_annotation">Gene function annotation</h3></div>
<p>All transcriptomic techniques have been particularly useful in <a href="Gene_annotation" class="mw-redirect" title="Gene annotation">identifying the functions of genes</a> and identifying those responsible for particular phenotypes. Transcriptomics of <i>Arabidopsis</i> <a href="Ecotype" title="Ecotype">ecotypes</a> that <a href="Hyperaccumulator" title="Hyperaccumulator">hyperaccumulate metals</a> correlated genes involved in <a href="Bioinorganic_chemistry#Metal_ion_transport_and_storage" title="Bioinorganic chemistry">metal uptake</a>, tolerance, and <a href="Homeostasis" title="Homeostasis">homeostasis</a> with the phenotype.<sup id="cite_ref-#19192189_158-0" class="reference"><a href="#cite_note-#19192189-158"><span class="cite-bracket">[</span>156<span class="cite-bracket">]</span></a></sup> Integration of RNA-Seq datasets across different tissues has been used to improve annotation of gene functions in commercially important organisms (e.g. <a href="Cucumis_sativus" class="mw-redirect" title="Cucumis sativus">cucumber</a>)<sup id="cite_ref-#22047402_159-0" class="reference"><a href="#cite_note-#22047402-159"><span class="cite-bracket">[</span>157<span class="cite-bracket">]</span></a></sup> or threatened species (e.g. <a href="Koala" title="Koala">koala</a>).<sup id="cite_ref-#25214207_160-0" class="reference"><a href="#cite_note-#25214207-160"><span class="cite-bracket">[</span>158<span class="cite-bracket">]</span></a></sup>
</p><p>Assembly of RNA-Seq reads is not dependent on a <a href="Reference_genome" title="Reference genome">reference genome</a><sup id="cite_ref-#21572440_124-1" class="reference"><a href="#cite_note-#21572440-124"><span class="cite-bracket">[</span>122<span class="cite-bracket">]</span></a></sup> and so is ideal for gene expression studies of non-model organisms with non-existing or poorly developed genomic resources. For example, a database of SNPs used in <a href="Pseudotsuga_menziesii" class="mw-redirect" title="Pseudotsuga menziesii">Douglas fir</a> breeding programs was created by <i>de novo</i> transcriptome analysis in the absence of a <a href="Genome_sequencing" class="mw-redirect" title="Genome sequencing">sequenced genome</a>.<sup id="cite_ref-#23445355_161-0" class="reference"><a href="#cite_note-#23445355-161"><span class="cite-bracket">[</span>159<span class="cite-bracket">]</span></a></sup> Similarly, genes that function in the development of cardiac, muscle, and nervous tissue in lobsters were identified by comparing the transcriptomes of the various tissue types without use of a genome sequence.<sup id="cite_ref-#26772543_162-0" class="reference"><a href="#cite_note-#26772543-162"><span class="cite-bracket">[</span>160<span class="cite-bracket">]</span></a></sup> RNA-Seq can also be used to identify previously unknown <a href="Protein_coding_region" class="mw-redirect" title="Protein coding region">protein coding regions</a> in existing sequenced genomes.
</p>
<div class="mw-heading mw-heading3"><h3 id="Non-coding_RNA">Non-coding RNA</h3></div>
<p>Transcriptomics is most commonly applied to the mRNA content of the cell. However, the same techniques are equally applicable to non-coding RNAs (ncRNAs) that are not translated into a protein, but instead have direct functions (e.g. roles in <a href="Translation_(genetics)" class="mw-redirect" title="Translation (genetics)">protein translation</a>, <a href="DNA_replication" title="DNA replication">DNA replication</a>, <a href="RNA_splicing" title="RNA splicing">RNA splicing</a>, and <a href="Transcriptional_regulation" title="Transcriptional regulation">transcriptional regulation</a>).<sup id="cite_ref-#1883196_163-0" class="reference"><a href="#cite_note-#1883196-163"><span class="cite-bracket">[</span>161<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#16943439_164-0" class="reference"><a href="#cite_note-#16943439-164"><span class="cite-bracket">[</span>162<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#16357227_165-0" class="reference"><a href="#cite_note-#16357227-165"><span class="cite-bracket">[</span>163<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#15851066_166-0" class="reference"><a href="#cite_note-#15851066-166"><span class="cite-bracket">[</span>164<span class="cite-bracket">]</span></a></sup> Many of these ncRNAs affect disease states, including cancer, cardiovascular, and neurological diseases.<sup id="cite_ref-#22094949_167-0" class="reference"><a href="#cite_note-#22094949-167"><span class="cite-bracket">[</span>165<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading2"><h2 id="Transcriptome_databases">Transcriptome databases</h2></div>
<p>Transcriptomics studies generate large amounts of data that have potential applications far beyond the original aims of an experiment. As such, raw or processed data may be deposited in <a href="Public_database" class="mw-redirect" title="Public database">public databases</a> to ensure their utility for the broader scientific community. For example, as of 2018, the Gene Expression Omnibus contained millions of experiments.<sup id="cite_ref-168" class="reference"><a href="#cite_note-168"><span class="cite-bracket">[</span>166<span class="cite-bracket">]</span></a></sup>
</p>
<table class="wikitable sortable">
<caption>Transcriptomic databases
</caption>
<tbody><tr>
<th>Name
</th>
<th>Host
</th>
<th>Data
</th>
<th>Description
</th></tr>
<tr>
<td><a href="Gene_Expression_Omnibus" title="Gene Expression Omnibus">Gene Expression Omnibus</a><sup id="cite_ref-#11752295_102-1" class="reference"><a href="#cite_note-#11752295-102"><span class="cite-bracket">[</span>100<span class="cite-bracket">]</span></a></sup>
</td>
<td><a href="National_Center_for_Biotechnology_Information" title="National Center for Biotechnology Information">NCBI</a>
</td>
<td>Microarray RNA-Seq
</td>
<td>First transcriptomics database to accept data from any source. Introduced <a href="MIAME" class="mw-redirect" title="MIAME">MIAME</a> and <a href="MINSEQE" class="mw-redirect" title="MINSEQE">MINSEQE</a> community standards that define necessary experiment metadata to ensure effective interpretation and <a href="Repeatability" title="Repeatability">repeatability</a>.<sup id="cite_ref-#11726920_169-0" class="reference"><a href="#cite_note-#11726920-169"><span class="cite-bracket">[</span>167<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#19484163_170-0" class="reference"><a href="#cite_note-#19484163-170"><span class="cite-bracket">[</span>168<span class="cite-bracket">]</span></a></sup>
</td></tr>
<tr>
<td>ArrayExpress<sup id="cite_ref-#25361974_171-0" class="reference"><a href="#cite_note-#25361974-171"><span class="cite-bracket">[</span>169<span class="cite-bracket">]</span></a></sup>
</td>
<td><a href="European_Nucleotide_Archive" title="European Nucleotide Archive">ENA</a>
</td>
<td>Microarray
</td>
<td>Imports datasets from the Gene Expression Omnibus and accepts direct submissions. Processed data and experiment metadata is stored at ArrayExpress, while the raw sequence reads are held at the ENA. Complies with MIAME and MINSEQE standards.<sup id="cite_ref-#11726920_169-1" class="reference"><a href="#cite_note-#11726920-169"><span class="cite-bracket">[</span>167<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-#19484163_170-1" class="reference"><a href="#cite_note-#19484163-170"><span class="cite-bracket">[</span>168<span class="cite-bracket">]</span></a></sup>
</td></tr>
<tr>
<td><a href="Expression_Atlas" title="Expression Atlas">Expression Atlas</a><sup id="cite_ref-#26481351_172-0" class="reference"><a href="#cite_note-#26481351-172"><span class="cite-bracket">[</span>170<span class="cite-bracket">]</span></a></sup>
</td>
<td><a href="European_Bioinformatics_Institute" title="European Bioinformatics Institute">EBI</a>
</td>
<td>Microarray RNA-Seq
</td>
<td>Tissue-specific gene expression database for animals and plants. Displays secondary analyses and visualisation, such as functional enrichment of <a href="Gene_ontology" class="mw-redirect" title="Gene ontology">Gene Ontology</a> terms, <a href="InterPro" title="InterPro">InterPro</a> domains, or pathways. Links to protein abundance data where available.
</td></tr>
<tr>
<td><a href="Genevestigator" title="Genevestigator">Genevestigator</a><sup id="cite_ref-#19956698_173-0" class="reference"><a href="#cite_note-#19956698-173"><span class="cite-bracket">[</span>171<span class="cite-bracket">]</span></a></sup>
</td>
<td>Privately curated
</td>
<td>Microarray RNA-Seq
</td>
<td>Contains manual curations of public transcriptome datasets, focusing on medical and plant biology data. Individual experiments are normalised across the full database to allow comparison of gene expression across diverse experiments. Full functionality requires licence purchase, with free access to a limited functionality.
</td></tr>
<tr>
<td>RefEx<sup id="cite_ref-#18835852_174-0" class="reference"><a href="#cite_note-#18835852-174"><span class="cite-bracket">[</span>172<span class="cite-bracket">]</span></a></sup>
</td>
<td><a href="DNA_Data_Bank_of_Japan" title="DNA Data Bank of Japan">DDBJ</a>
</td>
<td>All
</td>
<td>Human, mouse, and rat transcriptomes from 40 different organs. Gene expression visualised as <a href="Heatmap" class="mw-redirect" title="Heatmap">heatmaps</a> projected onto <a href="3D_computer_graphics" title="3D computer graphics">3D representations</a> of anatomical structures.
</td></tr>
<tr>
<td><a href="NONCODE" title="NONCODE">NONCODE</a><sup id="cite_ref-#26586799_175-0" class="reference"><a href="#cite_note-#26586799-175"><span class="cite-bracket">[</span>173<span class="cite-bracket">]</span></a></sup>
</td>
<td>noncode.org
</td>
<td>RNA-Seq
</td>
<td>Non-coding RNAs (ncRNAs) excluding tRNA and rRNA.
</td></tr></tbody></table>
<p><small>Legend: NCBI – National Center for Biotechnology Information; EBI – European Bioinformatics Institute; DDBJ – DNA Data Bank of Japan; ENA – European Nucleotide Archive; MIAME – Minimum Information About a Microarray Experiment; MINSEQE – Minimum Information about a high-throughput nucleotide SEQuencing Experiment.</small>
</p>
<div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2></div>
<ul><li><a href="Omics" title="Omics">omics</a>
<ul><li><a href="Genomics" title="Genomics">Genomics</a></li>
<li><a href="Proteomics" title="Proteomics">Proteomics</a></li>
<li><a href="Metabolomics" title="Metabolomics">Metabolomics</a></li>
<li><a href="Interactomics" class="mw-redirect" title="Interactomics">Interactomics</a></li></ul></li></ul>
<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>
<p><span typeof="mw:File"></span> <span class="">This article was adapted from the following source under a <span class=""><a rel="nofollow" class="external text" href="https://creativecommons.org/licenses/by/4.0/">CC BY 4.0</a></span> license (<a class="external text external" href="https://en.wikipedia.org/w/index.php?title=Transcriptomics_technologies&amp;action=history&amp;date-range-to=2017-05-23">2017</a>) (<a rel="nofollow" class="external text" href="http://topicpageswiki.plos.org/wiki/talk:Transcriptomics_technologies">reviewer reports</a>):
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<div class="mw-heading mw-heading3"><h3 id="Notes">Notes</h3></div>
<div class="mw-references-wrap"><ol class="references">
<li id="cite_note-39"><span class="mw-cite-backlink"><b><a href="#cite_ref-39">^</a></b></span> <span class="reference-text">In molecular biology,&nbsp;<b>hybridisation</b> is a phenomenon in which single-stranded deoxyribonucleic acid (<a href="DNA" title="DNA">DNA</a>) or ribonucleic acid (<a href="RNA" title="RNA">RNA</a>) molecules&nbsp;<a href="Nucleic_acid_thermodynamics#Annealing" title="Nucleic acid thermodynamics">anneal</a>&nbsp;to&nbsp;<a href="Complementarity_(molecular_biology)" title="Complementarity (molecular biology)">complementary DNA or RNA</a>.</span>
</li>
<li id="cite_note-56"><span class="mw-cite-backlink"><b><a href="#cite_ref-56">^</a></b></span> <span class="reference-text">One picolitre is about 30 million times smaller than a drop of water.</span>
</li>
</ol></div>
<div class="mw-heading mw-heading2"><h2 id="Further_reading">Further reading</h2></div>
<ul><li><cite id="CITEREFLoweShirleyBleackleyDolan2017" class="citation journal cs1">Lowe R, Shirley N, Bleackley M, Dolan S, Shafee T (May 2017). <a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5436640">"Transcriptomics technologies"</a>. <i>PLOS Computational Biology</i>. <b>13</b> (5): e1005457. <a href="Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/2017PLSCB..13E5457L">2017PLSCB..13E5457L</a>. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://doi.org/10.1371%2Fjournal.pcbi.1005457">10.1371/journal.pcbi.1005457</a></span>. <a href="PMC_(identifier)" class="mw-redirect" title="PMC (identifier)">PMC</a>&nbsp;<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5436640">5436640</a></span>. <a href="PMID_(identifier)" class="mw-redirect" title="PMID (identifier)">PMID</a>&nbsp;<a rel="nofollow" class="external text" href="https://pubmed.ncbi.nlm.nih.gov/28545146">28545146</a>.</cite></li>
<li><a rel="nofollow" class="external text" href="https://doi.org/10.1016/B978-0-12-809633-8.20163-5">Comparative Transcriptomics Analysis</a> in <a rel="nofollow" class="external text" href="https://www.sciencedirect.com/science/referenceworks/9780128096338">Reference Module in Life Sciences</a></li>
<li>Software used in transcriptomics:
<ul><li><a rel="nofollow" class="external text" href="https://cole-trapnell-lab.github.io/cufflinks/">cufflinks</a></li>
<li><a rel="nofollow" class="external text" href="https://pachterlab.github.io/kallisto/about">kallisto</a></li>
<li><a rel="nofollow" class="external text" href="http://ccb.jhu.edu/software/tophat/index.shtml">tophat</a></li></ul></li></ul></div><!--htdig_noindex--><div><div class="zim-footer">
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