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  • fungalE
    Junior Member
    • Feb 2012
    • 4

    #1

    Number of reads per isotig

    I have 454 data from cDNA sample. If I would like to report the number of reads of every isotig/contig, is it a correct way first to check the number of reads/contig from 454Allcontigs.fna. And after that check from the 454Isotigs.txt file which contigs forms an isotigs and sum the reads? What ways do you use? Is this a good way to report the most abundant transcripts?
  • flxlex
    Moderator
    • Nov 2008
    • 412

    #2
    Different parts of the same read may end up in different contigs, and isotigs are generated by combining contigs in different ways. This makes it difficult to get the number of reads used for an isotig. See also my explanation elsewhere (here and here)

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    • fungalE
      Junior Member
      • Feb 2012
      • 4

      #3
      I understand.

      Which way would you determine the most abundant transcripts? Is this possible? Can you ever use the number of reads?

      Comment

      • flxlex
        Moderator
        • Nov 2008
        • 412

        #4
        A really crude way would be to divide number of reads (for a contig) by contig length. But, using real statistics (FPKM and all that) gives a much more reliable answer.

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        • fungalE
          Junior Member
          • Feb 2012
          • 4

          #5
          real statistics

          Can you recommend any good articles about how this statistical work has been done?

          Comment

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