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Old 07-07-2018, 09:21 AM   #1
Junior Member
Location: Helsinki

Join Date: Apr 2017
Posts: 1
Default RNASeq library generation protocol issue(like QuantSeq)


I am trying to develop in-house protocol for RNA-seq library preparation in a way similar to Lexogen QuantSeq. QuantSeq includes double-stranded cDNA production with these major steps:
RT with dT(23)VN primer with overhang (i7 sequencing primer for NGS)
Removal of RNA (possibly with RNaseH)
Second strand synthesis with random primer with overhang (i5 seq primer for NGS)
These 3 steps are done without any purification. Then, they purify the product and perform PCR to add Illumina adapters.
I am wondering about step 3(second strand synthesis). I see the issue over here since dT(23)VN primer can also act as a primer for second strand synthesis. If so, during PCR to add Illumina adapters there could be an accumulation of a wrong product with two i7 adapters (adapters included in dT(23)VN primer). Any thoughts on how they overcome this issue? Thanks!
Short description for QuantSeq is here:
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Old 07-07-2018, 05:22 PM   #2
Jafar Jabbari
Location: Melbourne

Join Date: Jan 2013
Posts: 1,187

It should not be an issue as it requires polyA region for binding and priming. If there are such sequences (polyT) throughout the exons then some 1st strand cDNA might be primed but it will have negligible effect as these will not be sequenced due to lack of both flow cell binding motives.

Last edited by nucacidhunter; 07-07-2018 at 06:04 PM.
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ngs, rnaseq

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