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  • BWA and X bases

    Hi guys
    I was wondering whether anyone knows how the bwa aligner behaves with degenerated nucleotides. Say, for example, reference contains fifty X bases that could be any of the 4 canonical bases, and I align 50bp reads to it, should I expect all the reads will map to the X string? I have a gene as a reference, and for this gene I know the exons and the intron positions. However I do not have introns sequences. I was thinking to report 10/20 X upstream and downstream the exons in order to get more information about their beginning/ending sequence. Thanks!

  • #2
    No, no sequence will map exclusively to N or X with BWA (or any other aligner I've used). A read can extend into N or X, but it has to match a seed sequence outside of the masked area.

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    • #3
      Thanks!

      Thank you very much for your reply. This is a good news for the project I had in mind.
      Cheers

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