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With a show of hands, how many people still do size selection post ligation after shearing genomic DNA by Covaris ? I've heard that many skip size selection now, but many others still size select.
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For exome capture we don't do size selection. We purify with SPRI beads and that adequately removes adapter/primer-dimer. -
Depends how tight of a size distribution you want. We size select post-Covaris to get a narrow distribution allowing assembly of overlapping paired-end reads. Size selection can also help you get longer read lengths since all PCR based sequencing approaches (454, Illumina) do tend to enrich for smaller fragments.Comment
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