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We are also seeing double peaks in our RNA-seq library preps, even though all samples have been gel extracted at 350bp. Does anyone know how it is possible to still have 700 bp fragments after gel extraction and what we can do to remove the longer fragments? Thanks.
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Originally posted by zorph View Posthello
has anyone tried to do two rounds of DSN normalization (specifically for RNA-seq)? If so, how did you do it and how did it go? Thanks.
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two rounds DSN normalization
hello
has anyone tried to do two rounds of DSN normalization (specifically for RNA-seq)? If so, how did you do it and how did it go? Thanks.
Leave a comment:
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This happens in about a third of my RNA-Seq library preps. Try using the ultrapure T4 ligase from Enzymatics and titrating the amount of primers in the final step, going down by 0.1ul amounts from 1ul.
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I've seen this with ChIP-Seq libraries. I think the double peak is due to library PCR dimers forming. This is similar to primer-dimers but forms from PCR products dimerizing.
You see this more often if you use high cycle numbers in your amplification.
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RNA-seq library prep problems
We have been preparing libraries for Illumina GA and we have some problems with RNA-seq libraries. The issue that we are having is that we are seeing two peaks in bioanalyzer data (attached ppt). We are seeing this in all our RNA seq samples - no matter what organism used. We are using Illumina RNAseq kit. have anyone seen something like this? I would really appreciate any advice.Attached Files
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