Unconfigured Ad

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts
  • tboothby
    Member
    • May 2011
    • 56

    Tophat -> Cuffdiff missing sequences

    Hi all. I am hoping you guys can help me with an issue, I apologize for my newbish-ness ahead of time, I am still trying to learn the software.

    Background:
    I run tophat/bowtie on a RNAseq sample and check the accepted_hits.bam file for "sequenceX" in IGV. I find that sequenceX has good coverage in my sample.

    I use this accepted_hits.bam file with cufflinks. I check the transcripts.gtf file for sequenceX and find it is not there.

    Question:
    Does this make sense? Why would this be happening? Maybe I am not understanding how the software works, but I thought if I provided a reference for sequenceX and have RNAseq data with fragments fully covering sequenceX, that I should get sequenceX being assembled by cufflinks.

    In addition:
    I have used the exact same RNAseq data with Trinity to de novo assemble a transcriptome and sequenceX is assembled perfectly.
  • dekkers
    Junior Member
    • Jun 2013
    • 4

    #2
    Did you ever find an answer to this question? I am having the same problem.
    Thanks!

    Comment

    Latest Articles

    Collapse

    • SEQadmin2
      Nine Things a Sample Prep Scientist Thinks About Before Sequencing
      by SEQadmin2


      I’m not a sequencing expert. I’m a purification scientist who uses NGS to evaluate workflows my group develops. With this perspective, we think about the sample first and the NGS workflow second. The sequencer is an exceptionally honest reporter, but it can only report on what you give it, so whether you get clean, interpretable data from an NGS workflow is largely determined before you begin.


      Here are nine questions we think about, in roughly the order they matter, before...
      06-18-2026, 07:11 AM
    • SEQadmin2
      From Collection to Sequencing: Why Sample Preparation and Preservation Define Sequencing Data
      by SEQadmin2


      Data variability is still an issue in sequencing technologies despite the advances in reproducibility and accuracy of these platforms. But the problem does not originate in the sequencing itself, but in the previous steps, before the sample reaches the sequencer.


      The first step is collection, followed by preservation and sample preparation for analysis. Most scientists overlook those steps, but not being careful might just be skewing the experiment’s results.
      ...
      06-02-2026, 10:05 AM

    ad_right_rmr

    Collapse

    News

    Collapse

    Topics Statistics Last Post
    Started by SEQadmin2, 06-17-2026, 06:09 AM
    0 responses
    26 views
    0 reactions
    Last Post SEQadmin2  
    Started by SEQadmin2, 06-09-2026, 11:58 AM
    0 responses
    43 views
    0 reactions
    Last Post SEQadmin2  
    Started by SEQadmin2, 06-05-2026, 10:09 AM
    0 responses
    48 views
    0 reactions
    Last Post SEQadmin2  
    Started by SEQadmin2, 06-04-2026, 08:59 AM
    0 responses
    49 views
    0 reactions
    Last Post SEQadmin2  
    Working...