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Synergy between DNA polymerases increases polymerase chain reaction inhibitor tolerance in forensic DNA analysis
Department of Applied Microbiology, Lund University, Sweden.
Swedish National Laboratory of Forencis Sciences, Linkoping, Sweden.
National Laboratory of Forensic Sciences, Linkoping, Sweden.
National Laboratory of Forensic Sciences, Linkoping, Sweden.
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2010 (English)In: Analytical Biochemistry, ISSN 0003-2697, E-ISSN 1096-0309, Vol. 405, 192-200 p.Article in journal (Refereed) Published
Abstract [en]

The success rate of diagnostic polymerase chain reaction (PCR) analysis is lowered by inhibitory substancespresent in the samples. Recently, we showed that tolerance to PCR inhibitors in crime scene salivastains can be improved by replacing the standard DNA polymerase AmpliTaq Gold with alternative DNApolymerase–buffer systems (Hedman et al., BioTechniques 47 (2009) 951–958). Here we show thatblending inhibitor-resistant DNA polymerase–buffer systems further increases the success rate of PCRfor various types of real crime scene samples showing inhibition. For 34 of 42 ‘‘inhibited” crime scenestains, the DNA profile quality was significantly improved using a DNA polymerase blend of ExTaq HotStart and PicoMaxx High Fidelity compared with AmpliTaq Gold. The significance of the results was confirmedby analysis of variance. The blend performed as well as, or better than, the alternative DNA polymerasesused separately for all tested sample types. When used separately, the performance of the DNApolymerases varied depending on the nature of the sample. The superiority of the blend is discussed interms of complementary effects and synergy between the DNA polymerase–buffer systems.

Place, publisher, year, edition, pages
-: Elsevier Inc. , 2010. Vol. 405, 192-200 p.
Keyword [en]
DNA polymerase, DNA polymerase blend, Forensic DNA analysis, PCR inhibition, PCR inhibitors, Synergy
National Category
Natural Sciences
URN: urn:nbn:se:liu:diva-58545DOI: 10.1016/j.ab.2010.06.028OAI: diva2:343478
Available from: 2010-08-13 Created: 2010-08-13 Last updated: 2012-01-17Bibliographically approved

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