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  • ornam
    Junior Member
    • Dec 2010
    • 3

    cufflinks transcript on wrong strand

    Hi,

    I've run tophat (v.1.1.4) and cufflinks (v0.9.2) on paired-end stranded RNA-seq data.
    When I examined the transcripts produced by cufflinks for my favorite gene (using the UCSC genome browser), I found to my dismay that the transcript was on the wrong strand. When I examined the junctions.bed file for the region the junctions are on the correct strand.
    Below are the commands I used for tophat and cufflinks:
    tophat -p 12 -o SC3_s_7_tophat_defaults_out -r 48 --mate-std-dev 27 --solexa1.3-quals --coverage-search --microexon-search --library-type fr-unstranded hg19 SC3_s_7_1_sequence.txt SC3_s_7_2_sequence.txt

    cufflinks accepted_hits.bam -L SC3 -p 20 -r /lab/db/bowtie/hg19.fa --library-type fr-firststrand

    Any insight/help would be appreciated...
    Orna
  • ornam
    Junior Member
    • Dec 2010
    • 3

    #2
    re: cufflinks transcript on wrong strand

    Just an update - I've since checked four other genes, and they all show the same phenomenon. So, this seems to be a systematic problem.

    Orna

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    • ornam
      Junior Member
      • Dec 2010
      • 3

      #3
      cufflinks transcripts on wrong strand - retraction

      This is really embaressing - upon examining the cufflinks command I ran (as posted in my original post) I found that I actually ran with a different libraryType than I had intended (fr-firststrand instead of fr-unstranded). When I do run with libraryType set at fr-unstranded the transcripts are on the right strand. So, I am retracting my original complaint.

      with humble apologies
      Orna

      Comment

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