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  • how to get ungapped alignment from BWA?

    I am dealing with some RNA-seq data. First, I assemblied the short reads to contigs using Trinity, and then map the short reads to the contigs using BWA. I would like to get ungapped alignment from BWA by setting -o to 0 and other parameters as default. However, I still got gapped alignment. So my question is: what parameter should I set to get ungapped alignment from BWA. Thanks in advance!

  • #2
    -o 0 should stop any gapped alignment.

    A slightly "hacked" solution would be to grep for lines containing XO:i:0 from the resulting SAM/BAM files. These will be the ones without gaps.

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