Unconfigured Ad

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • yvan.wenger
    Member
    • Aug 2009
    • 30

    #1

    Soft. to remove 5prime matches (to the left) from Illumina reads

    Hello everybody,

    My data contains trans-spliced leaders, i.e. short sequences that are attached to the 5 prime end of RNAs after transcription. In the organism I*use, there are about 15 of them known and some transcripts are attached with multiple types. I would like to remove them before de-novo RNA-seq assembly.

    Trimmomatic is great but removes reads to the right of the match. In this case I'd like to clip the left part instead.

    Cutadapt and Adapterremoval are also good but the "adapters" specification need to be in the command line to my knowledge. That would mean sequentially using one of those tools 15 times to remove the 15 different trans-spliced leaders.

    Anyone know another efficient tool that can remove partial/imperfect matches with leading sequences (=to the left)? I*have ~1billion illumina SE short reads.

    Many thanks.

    Yvan
  • epistatic
    Senior Member
    • Mar 2009
    • 129

    #2
    Try Btrim. You can create an index sequence txt and trim 3' and/or 5'.

    Comment

    Latest Articles

    Collapse

    • SEQadmin2
      16S/ITS Profiling vs. Shotgun Metagenomics: What Changes in Your Workflow?
      by SEQadmin2




      NGS has revolutionized clinical microbiology by offering new ways to identify and surveil pathogens without prior knowledge of the target. One popular approach is 16S rRNA and ITS amplicon sequencing, which targets specific microbial markers. But studies are increasingly incorporating shotgun metagenomics, a technique that sequences all DNA from a sample without targeting specific microbial markers. This approach allows more detailed taxonomic classification, detection...
      Today, 06:46 AM
    • SEQadmin2
      Multiomic Liquid Biopsy: What DNA/RNA Panels Reveal That DNA Alone Can’t
      by SEQadmin2



      Tumors contain complex mixtures of cell populations that evolve in response to treatment and host-specific factors. Tissue biopsies provide only static snapshots of a tumor’s state. But what if we could follow that evolution over time using a minimally invasive technique?

      Liquid biopsies can detect tumor-derived material circulating in the bloodstream, providing a way to study treatment response, detect emerging resistance, and discover new biomarkers. Circulating
      ...
      10-14-2026, 09:55 AM

    ad_right_rmr

    Collapse

    News

    Collapse

    Topics Statistics Last Post
    Started by SEQadmin2, 10-28-2026, 09:57 AM
    0 responses
    22 views
    0 reactions
    Last Post SEQadmin2  
    Started by SEQadmin2, 10-28-2026, 09:51 AM
    0 responses
    14 views
    0 reactions
    Last Post SEQadmin2  
    Started by SEQadmin2, 10-22-2026, 11:13 AM
    0 responses
    68 views
    0 reactions
    Last Post SEQadmin2  
    Started by SEQadmin2, 10-22-2026, 10:48 AM
    0 responses
    48 views
    0 reactions
    Last Post SEQadmin2  
    Working...