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  • carmeyeii
    Senior Member
    • Mar 2011
    • 137

    #1

    Which strand of the mRNA molecule does the sequencer output as a "read"?

    In Illumina Stranded RNA-Seq (using the dUTP method), do the final reads in the fastq files correspond to the initial molecule (that was transcribed), or to the reverse complement of the molecule?

    C
  • kmcarr
    Senior Member
    • May 2008
    • 1181

    #2
    Originally posted by carmeyeii View Post
    In Illumina Stranded RNA-Seq (using the dUTP method), do the final reads in the fastq files correspond to the initial molecule (that was transcribed), or to the reverse complement of the molecule?

    C
    It will be different for read 1 and read 2. For the dUTP stranded protocol read 1 is the reverse complement of the mRNA, read 2 matches the sequence and direction of the mRNA. Further, read 2 should be positioned to the left (5') of read 1, when considered in transcript coordinate space.

    Comment

    • carmeyeii
      Senior Member
      • Mar 2011
      • 137

      #3
      Thanks kmcarr,

      So the strand with the same sequence and direction of the mRNA is the one retained for the first phase of paired-end sequencing, covalently linked through the P7 adapter?

      C

      Comment

      • kmcarr
        Senior Member
        • May 2008
        • 1181

        #4
        Originally posted by carmeyeii View Post
        Thanks kmcarr,

        So the strand with the same sequence and direction of the mRNA is the one retained for the first phase of paired-end sequencing, covalently linked through the P7 adapter?

        C
        Yes, it is.

        Comment

        • carmeyeii
          Senior Member
          • Mar 2011
          • 137

          #5
          my brain is now at rest.

          thank you.

          Comment

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