Unconfigured Ad

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • AdrianP
    Senior Member
    • Apr 2011
    • 130

    #1

    bwa map single and PE reads to ref?

    Hello,

    I want to store detect my variants in a VCF format. For that I need to map my PE reads (100x2) to reference. What I have discovered however is that for a lot of my PE reads, the fragments size is smaller than 200bp, which means some PE reads overlap, increasing the coverage of a region artificially.

    I thought I would merge the PE reads with SeqPrep to place all PE reads that overlap in a merged.fastq file.

    My question is, how do I then map both unmerged PE reads and merged SE reads to the genome with bwa? I only know how to do it if it's only SE or only PE.

    Also, does this approach sound reasonable?

    Adrian

    Biostar: http://www.biostars.org/p/97423/#97430
  • Brian Bushnell
    Super Moderator
    • Jan 2014
    • 2709

    #2
    Map the single-ended reads, then map the paired reads, then merge the two sam files. We do that all the time.

    Comment

    • AdrianP
      Senior Member
      • Apr 2011
      • 130

      #3
      Sorry I have never merged 2 sam files together, how would I do that?
      Code:
      cat *.sam > new.sam
      ?

      Thanks for the advice!

      Comment

      • Brian Bushnell
        Super Moderator
        • Jan 2014
        • 2709

        #4
        Try samtools merge.

        Comment

        • dpryan
          Devon Ryan
          • Jul 2011
          • 3478

          #5
          As I mentioned on Biostars, just use a variant caller that isn't confused by paired-end reads. GATK is one such example.

          Comment

          Latest Articles

          Collapse

          • 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
          • SEQadmin2
            New Genomics Technologies Take Aim at Long-Standing Limits
            by SEQadmin2


            Researchers using sequencing and genomics tools often have to make trade-offs. They can choose between speed or scale, short reads or long-range information, or targeted panels or a view of the whole transcriptome. New technologies that have been released this year are built to address those tough choices.

            We asked six companies the same four questions to learn about their latest products. The new technologies bring a lot to the table, including rethinking sequencing
            ...
            09-28-2026, 10:25 AM

          ad_right_rmr

          Collapse

          News

          Collapse

          Topics Statistics Last Post
          Started by SEQadmin2, 10-22-2026, 11:13 AM
          0 responses
          49 views
          0 reactions
          Last Post SEQadmin2  
          Started by SEQadmin2, 10-22-2026, 10:48 AM
          0 responses
          37 views
          0 reactions
          Last Post SEQadmin2  
          Started by SEQadmin2, 10-15-2026, 10:52 AM
          0 responses
          46 views
          0 reactions
          Last Post SEQadmin2  
          Started by SEQadmin2, 10-14-2026, 05:39 AM
          0 responses
          46 views
          0 reactions
          Last Post SEQadmin2  
          Working...