{"id":820,"date":"2017-03-08T23:53:00","date_gmt":"2017-03-08T23:53:00","guid":{"rendered":"https:\/\/www.idtdna.com\/page\/use-of-template-switching-oligos-ts-oligos-tsos-for-efficient-cdna-library-construction"},"modified":"2025-09-08T21:07:41","modified_gmt":"2025-09-08T21:07:41","slug":"use-of-template-switching-oligos-ts-oligos-tsos-for-efficient-cdna-library-construction","status":"publish","type":"post","link":"https:\/\/sg.idtdna.com\/page\/support-and-education\/decoded-plus\/use-of-template-switching-oligos-ts-oligos-tsos-for-efficient-cdna-library-construction\/","title":{"rendered":"Use of Template Switching Oligos (TS Oligos, TSOs) for efficient cDNA library construction"},"content":{"rendered":"<h3>Quick facts <\/h3>\n<p><strong>Composition:<\/strong> Chimeric DNA\/RNA Oligo <\/p>\n<p> <strong>Ordering path:<\/strong> Order as a <a href=\"\/pages\/products\/custom-dna-rna\/custom-rna-oligos\">Custom RNA Oligo<\/a>&nbsp;<\/p>\n<p> <strong>Typical length:<\/strong> ~30 bases <\/p>\n<p> <strong>Scales: <\/strong>100 nmol to large scale synthesis <\/p>\n<p> <strong>Purification:<\/strong> Standard desalt; RNase-free HPLC available on request <\/p>\n<p> <strong>Website ordering symbol:<\/strong> Use lower case &ldquo;r&rdquo; in front to specify ribonucleotide bases (e.g,, ACTGCrGrGrG) <\/p>\n<h3>Under-representation of mRNA 5' end sequences<\/h3>\n<p>Emerging high-throughput technologies such as <a href=\"\/pages\/products\/next-generation-sequencing\/workflow\/xgen-ngs-library-preparation\/rna-library-preparation\">RNA-seq<\/a> have enabled functional dissection of complex transcriptomes with a minimal amount of RNA input. Quantification of individual transcripts or identification of novel transcripts requires an efficient approach to convert mRNA molecules into cDNA. However, conventional cDNA construction methods often result in an under-representation of the 5' end sequences of the mRNA, which poses a technical obstacle [<a href=\"#references\">1,2<\/a>].<\/p>\n<h3>SMART technology with a TS Oligo secures 5' end transcript sequences<\/h3>\n<p> Described originally in 2001, a strategy frequently referred to as &ldquo;SMART&rdquo; (switching mechanism at the 5' end of the RNA transcript) technology (Takara Bio USA, Inc) has shown promise in generating full-length cDNA libraries, even from single-cell&ndash;derived RNA samples [<a href=\"#references\">1,3<\/a>]. This strategy relies on the intrinsic properties of the Moloney murine leukemia virus (MMLV) reverse transcriptase and the use of a unique TS Oligos. During first-strand synthesis when priming with an oligo dT primer to capture polyadenylated transcripts, upon reaching the 5' end of the RNA template, the terminal transferase activity of the MMLV reverse transcriptase adds a few additional nucleotides (mostly deoxycytidine) to the 3' end of the newly synthesized cDNA strand.&nbsp; These bases function as a TS Oligo-anchoring site. Upon base pairing between the TS Oligo and the appended deoxycytidine stretch, the reverse transcriptase \"switches\" template strands, from mRNA to the TS Oligo, and continues replication to the 5' end of the TS Oligo. By doing so, the resulting cDNA contains the complete transcript, and universal sequences of choice are added to each end of the reverse transcription product. Along with tagging of the mRNA 3' end by oligo dT primers, we recommend also incorporating a 5&rsquo; primer in order amplify the entire full-length cDNA pool in a sequence-independent manner [<a href=\"#references\">4<\/a>]. See Figure 1 for a schematic of this method. <\/p>\n<p><figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.idtdna.com\/page\/wp-content\/uploads\/idt-images\/51705a15-3279-6e2e-aa53-ff00001c1b3c-schematic-representation-the-smart-technology.png\" data-displaymode=\"Original\" alt=\"Schematic-representation-the-SMART-technology\" title=\"Schematic-representation-the-SMART-technology\" data-openoriginalimageonclick=\"true\" \/><figcaption class=\"image-caption\">Schematic representation of SMART technology. The light blue and orange rectangles correspond to amplification primer tags. <\/figcaption><\/figure>\n<\/p>\n<h3>TS Oligo structure <\/h3>\n<p>The simple version of a TS Oligo is a DNA oligo sequence that carries 3 riboguanosines (rGrGrG) at its 3' end [<a href=\"#references\">1<\/a>]. The complementarity between these consecutive rG bases and the 3' dC extension of the cDNA molecule empowers the subsequent template switching [<a href=\"#references\">5<\/a>]. A more recent study suggested replacing the 3' most rG with a locked nucleic acid base to enhance thermostability, which is advantageous for the short stretch of base pairing [<a href=\"#references\">6<\/a>]. <\/p>\n<p> Interestingly, a systematic study was conducted in 2013 to compare the multiple modified TS Oligo versions side-by-side, and the data indicated that RNA\/DNA hybrids provide a superior level of 5' cap-specific enrichment, even though the DNA\/locked nucleic acid duplexes were expected to be more thermodynamically favored [<a href=\"#references\">7<\/a>].<\/p>\n<p> Driven by the growing interest in transcriptomics, alternative modification patterns have been explored to further improve TS Oligo performance. For instance, in 2010 researchers reported an approach to reduce library background and thereby improve cDNA yield by incorporating isomeric nucleotides into the TS Oligo [<a href=\"#references\">8<\/a>]. In this study, 2 modified bases, iso-dC and iso-dG, were appended to the 5&rsquo; end of the TS Oligo. These 2 modifications, which are chemical variants of cytosine and guanine, respectively, form hydrogen bonds with each other but not with naturally occurring C and G nucleotides. As anticipated, this modified version showed efficacy in minimizing the concatenation of TS Oligos, which typically results from cycles of reverse transcriptase activity [<a href=\"#references\">8,9<\/a>].<\/p>\n<h3>Ordering TS Oligos<\/h3>\n<p>Taken together, TS Oligos attach a universal primer-binding site through the activity of MMLV reverse transcriptase, enabling exclusive amplification of intact cDNA molecules. TS Oligos containing 3' rGs can be ordered from the <a href=\"\/pages\/products\/custom-dna-rna\/custom-rna-oligos\">Custom RNA Oligos ordering page<\/a>&nbsp;on the IDT website. You can further customize your TS Oligo&nbsp;with unique properties by incorporating additional chemical modifications from this same ordering page.<\/p>\n<p> <a href=\"\/pages\/about\/contact-us\">Contact us <\/a>with any questions about ordering modified oligos or to discuss your experimental design.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Quick facts Composition: Chimeric DNA\/RNA Oligo Ordering path: Order as a Custom RNA Oligo&nbsp; Typical length: ~30 bases Scales: 100 nmol to large scale synthesis Purification: Standard desalt; RNase-free HPLC available on request Website ordering symbol: Use lower case &ldquo;r&rdquo; in front to specify ribonucleotide bases (e.g,, ACTGCrGrGrG) Under-representation of mRNA 5' end sequences Emerging [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"ct_builder_shortcodes":"","ct_template_type":"","ct_parent_template":0,"inline_featured_image":false,"footnotes":""},"class_list":["post-820","post","type-post","status-publish","format-standard","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Template Switching Oligos For cDNA Library Construction | IDT<\/title>\n<meta name=\"description\" content=\"Use template switching oligos (TSOs) for efficient cDNA library construction, streamline workflows and improve transcriptome coverage.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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