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Parsing out very similar sequences from paired amplicon sequencing

I'm new to NGS and am submitting amplicons of similar sequences out for illumina. I initially just want to quantify the relative representation of these sequences.

The library for sequencing looks like.

5’ sequencing primer – forward primer – sequence of interest – reverse complement of reverse primer – reverse complement of 3’ sequencing primer

I am wondering if this workflow makes sense:

  1. Trim Illumina adapters and the primers from both ends.
  2. Merge reads.
  3. Throw away anything that is too similar to disentangle (some threshold on length)

I believe the similarity of the sequencing poses an issue for merging.

amplicon umi sequencing

What is the size of your amplicons and how many cycles are you planning to sequence?

Amplicons are 150-500bp . looking at ~25 cycles

Is that the entire produce as you depicted in the original post? Your reads will not overlap in the middle with 25 cycles. You will need to get longer reads. Probably 300 cycles paired-end for the largest amplicons.

Derp I got confused with cycles, that was the PCR. I am getting 100k reads and 250 cycles.

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