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  • How to extract sequence from multiple position in sorted bam files

    Hi All,

    My research need to extract sequence from multiple position in sorted bam files.
    I have the bam files sorted. I would like to extract and keep sequence from multiple positions according to chromosomal coordination, such as a bed file. I want a new bam/sam/fastq/fasta files keep the reads' name but only keep those sequence and discard sequence outside of the coordination.

    For example
    reference:
    TATCCGA

    positions:
    0123456

    sorted reads:
    1. ATCCGA
    2. ACCCGT
    3. ATCCGT
    4.TATCCGA

    The positions I interest in is 2 and 6
    the reference in position 2 and 6 is T and A

    The new sequence after extraction:
    1. TA
    2. CT
    3. TT
    4. TA

    I have tried intersectbed and cat samtools view. May be I miss some tricks, these attemps only give the whole sequence of reads cover those positions.


    Please help.
    Last edited by mhgseq; 06-07-2016, 08:36 AM.

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