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  • BWA aligner - zebrafish miRNA

    Hello,

    I have couple of questions with regard to SOLiD reads and BWA aligner for analyzing zebrafish miRNA results.

    1. I am using BWA to align my reads and I do not get any unique reads. I am not sure if this has something to do with indexing zebrafish genome. They are couple of different fasta (.fa) files available for download.

    a) danRer6.fa.gz - "Soft-masked" assembly sequence in one file.
    Repeats from RepeatMasker and Tandem Repeats Finder (with period
    of 12 or less) are shown in lower case; non-repeating sequence is
    shown in upper case. (I tried this one)

    b) danRer6.fa.masked.gz - "Hard-masked" assembly sequence in one file.
    Repeats are masked by capital Ns; non-repeating sequence is shown in
    upper case.

    c) danRer6.fa.out.gz - RepeatMasker .out file. RepeatMasker was run with the -s (sensitive) setting.

    Which one of these is the correct one to use?

    Second question I am having is 2) what options to use for bwa aln (I tried bwa aln -n 3 -t 2) to delete bad reads.

    Any help will be really helpful.

    Thank you

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