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bwa masked sequence?

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  • rand
    replied
    thanks

    Thanks!

    I just want to add that the N's in my sequence are not for ambigious bases, they represent a sequence gap of unknown size.. So basically its a long stretch [ATGC]+NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN[ATGC]+
    Last edited by rand; 11-09-2009, 08:08 AM.

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  • lh3
    replied
    This is a known issue. Ambiguous bases are converted to random sequences. If you use bwa-short, the XN tag tells you how many "N" in the alignment. If you use bwasw, you do not get this information, but you may find such hits by checking you reference genome.

    The chance of a good alignment arising from random hits is vanishingly small. Just ignore those hits.

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  • rand
    started a topic bwa masked sequence?

    bwa masked sequence?

    Does anyone know if BWA is handling masked sequences properly? I'm having a problem where I find some reads aligned to genome gaps. I have tried converting the N's to X's, but still encountering the same problem.
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