Polymerase Resistance to Polymerase Chain Reaction Inhibitors in Bone*

Authors

  • Kenneth D. Eilert M.S.,

    1. Forensic Science Program, School of Criminal Justice, Michigan State University, East Lansing, MI 48824.
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    • Present address: Kenneth D. Eilert, Indiana State Police Laboratory, Indianapolis, IN 46202.

  • David R. Foran Ph.D.

    1. Forensic Science Program, School of Criminal Justice and Department of Zoology, Michigan State University, East Lansing, MI 48824.
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  • *

    Presented at the 58th Annual Meeting of the American Academy of Forensic Sciences in San Antonio, Texas, February 19–24, 2007.

Additional information and reprint requests: David R. Foran, Ph.D. School of Criminal Justice and Department of Zoology 560 Baker Hall Michigan State University East Lansing, MI 48824
E-mail: foran@msu.edu

Abstract

Abstract:  Amplification of DNA from aged or degraded skeletal remains can be a challenging task, in part due to naturally occurring inhibitors of the polymerase chain reaction. PCR inhibitors may act by inactivating a polymerase itself, or compete with or bind other reaction components, although various polymerases may be differentially susceptible to such insult. In this study, ten thermostable polymerases from six bacterial species were examined for their ability to amplify DNA in the presence of bone-derived or individual PCR inhibitors. Two polymerases, one from Thermus aquaticus and one from Thermus thermophilus, showed lower susceptibility to inhibition from bone, while polymerases from Thermus flavus were highly susceptible. Addition of bovine serum albumin improved the activity of most of the enzymes. Taken together, the results indicate that thermostable DNA polymerases have different susceptibility to bone-derived PCR inhibitors, and that those most often used in forensic laboratories may not be optimal when working with DNA from skeletal remains.

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