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  • TopHat --no-discordant option

    Dear All,

    I am new to the RNASeq data analysis and I have a query regarding TopHat for, RNASeq data containing paired-end reads, some specific options to be used.

    I am using TopHat v2.0.10 on ubuntu and it works fine and gives the output files with default options but when I use the options "--no-discordant" and "--no-mixed" to get more specific outcomes I get an error at the stage of "tophat_reports" with a message like this.

    [FAILED]
    Error running tophat_reports
    Loaded ****** junctions


    I tried searching to see if someone else had the same problem and then I found a suggestion that v2.0.9 works with these options but after testing it I found the same error at the stage of "tophat_reports".

    It will be very nice if anyone could please help me if there is something that I am doing wrong? This is the way I am using it:

    tophat2 -p 8 -G genes.gtf --no-discordant --no-mixed -o output_dir genome reads1.fq reads2.fq

    I also tried with only one option at a time like using "--no-mixed" and only using "--no-discordant":

    tophat2 -p 8 -G genes.gtf --no-mixed -o output_dir genome reads1.fq reads2.fq

    tophat2 -p 8 -G genes.gtf --no-discordant -o output_dir genome reads1.fq reads2.fq

    The tophat run process with the --no-mixed option works fine in both v2.0.10 and v2.0.9 also but the tophat run process with the --no-discordant option fails in both the versions with the same error as mentioned above. So I am guessing that there is some issue with using the --no-discordant option.

    Is there some other version which works with these options together or only with the --no-discordant option or is there something that I can fix to overcome the error so that the process can be completed with the --no-discordant option?

    Thank You

    Regards,
    Pawan

  • #2
    chpawan I am also having the same problem and getting the exact error and only when I use the --no-discordant option
    Please let me know if you have fixed the problem .
    thanks.

    Comment


    • #3
      This has been an issue in the past:





      I believe it is an issue with the script that needs to be addressed... looks like there is no solution right now. Particularily an issue with larger datasets. Someone said that updating Samtools might help, but that's all I can offer... sorry bud.

      Comment


      • #4
        sorry, I put the same link twice... Here is the second link.

        Discussion of next-gen sequencing related bioinformatics: resources, algorithms, open source efforts, etc


        Also, someone mentioned that increasing their RAM helped. Are you working with little available RAM?

        Comment

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