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  • figo1019
    Member
    • Jun 2012
    • 32

    #1

    RNA seq data preprocessing and cleaning

    Hi All,

    I am a total newbies in this field. I have to assemble RNA seq data. Before that I need to trim the sequences. I have got 100bp illumina paired end reads in two files. I also got the adaptors sequences P5 and P7.
    5-AATGATACGGCGACCACCGAGATCTACACGTTCAGAGTTCTACAGTCCGACGATC-(insert)-ACCTTAAGAGCCCACGGTTCCTTGAGGTCAGTGXXXXXXTAGAGCATACGGCAGAAGACGAAC-3
    I tried trim_galore... but still I can see these much of overrepresented sequences in the fastqc report.

    ATGACACTCAAACAGGCATGCTCCACGGAATACCATGGAGCGCAAGGTGC 1155666 2.5956349017221085 No Hit
    AATGACGCTCGAACAGGCATGCCCCTCGGAATACCAAGGGGCGCAATGTG 225179 0.5057538004361837 No Hit
    AAGACACTCAAACAGGCATGCCTCTCGGAATACCAAGAGGCGCAAGGTGC 218636 0.4910581711090531 No Hit
    GATCGTCGGACTGTAGAACTCTGAACGTGTAGATCTCGGTGGTCGCCGTATCATTAAAAA 119619 0.2686652123616139 Illumina RNA PCR Primer (100% over 50bp)
    GATCGTCGGACTGTAGAACTCTGAACGTGTAGATCTCGGTGGTCGCCGTATCATTAAAAAA 111925 0.251384428005364 Illumina RNA PCR Primer (100% over 50bp)
    AAATGACGCTCAAACAGGCATGCCCTTTGGAATACCAAAGGGCGCAATGT 104210 0.2340564774843778 No Hit
    ACAAACCCTTGTGTCGAGGGCTGACTTTCAATAGATCGCAGCGAGGGAGC 71881 0.16144528987673504 No Hit
    GATCGTCGGACTGTAGAACTCTGAACGTGTAGATCTCGGTGGTCGCCGTATCATTAAA 46463 0.10435626248303084 Illumina RNA PCR Primer (100% over 50bp)

    I wanted to know how i can remove this overrepresented sequences from my data and do i need to remove it all ?

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