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Medical DNA test question

  1. Mar 27, 2008 #1

    lisab

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    DNA tests can now be done from a cheek swab. But since our mouths are full of bacteria, how is that DNA separated from human DNA?
     
  2. jcsd
  3. Mar 27, 2008 #2
    Simply put, generally it is not. But for the tests you perform a PCR using specific primers so that bacterial contamination is not an issue.
     
  4. Mar 27, 2008 #3

    lisab

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    Are those primers human-specific?

    I'm guessing it's not only bacteria that could contaminate a cheek swab, but food could, as well. It would be quite surprising to take a DNA test and find that you're the offspring of celery and a cow :rofl: .
     
  5. Mar 27, 2008 #4
    Yes they are. To be precise they are specific to certain conserved loci in the human genome.
     
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