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Mixed signal in the middle of sequencing trace

Home › Forums › DNA Sequencing Forum › Mixed signal in the middle of sequencing trace

  • This topic has 2 replies, 2 voices, and was last updated 16 years, 8 months ago by Anonymous.
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    • November 10, 2009 at 6:09 am #1187
      Anonymous
      Inactive

      I have encountered a situation in which a sequencing trace is of good quality and has single peaks but halfway through (about 200bp), the peaks suddenly become mixed (“peak under peak”) all the way to the end. This was observed in a few other samples of the same sequencing batch. What could have been the problem? Thank you in advance.

    • December 3, 2009 at 6:09 am #1188
      Daniel
      Keymaster

      This sound like an indel. Are you sequencing PCR products from a heterozygous individual?

      Daniel Tillett
      Nucleics Support

    • March 5, 2010 at 6:09 am #1189
      Anonymous
      Inactive

      nucleics Wrote:
      ——————————————————-
      > This sound like an indel. Are you sequencing PCR
      > products from a heterozygous individual?

      Yes. We finally understood why we got these results are you’re right indeed. It was a heterozygous individual. Thanks!

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