Format

Send to:

Choose Destination
See comment in PubMed Commons below
Biotechniques. 2009 Oct;47(4):857-66. doi: 10.2144/000113219.

Reducing the impact of PCR-mediated recombination in molecular evolution and environmental studies using a new-generation high-fidelity DNA polymerase.

Author information

  • 1Graduate Program in Organismic and Evolutionary Biology, University of Massachusetts, Amherst, MA 01003, USA. dlahr@nsm.umass.edu

Abstract

PCR-mediated recombination can greatly impact estimates of diversity, both in environmental studies and in analyses of gene family evolution. Here we measure chimera (PCR-mediated recombinant) formation by analyzing a mixture of eight partial actin sequences isolated from the amoeba Arcella hemisphaerica amplified under a variety of conditions that mimic standard laboratory situations. We further compare a new-generation proofreading processivity-enhanced polymerase to both a standard proofreading enzyme and previously published results. Proofreading polymerases are preferred over other polymerases in instances where evolutionary inferences must be made. Our analyses reveal that reducing the initial template concentration is as critical as reducing the number of cycles for decreasing chimera formation and improving accuracy. Furthermore, assessing the efficiency of recovery of original haplotypes demonstrates that multiple PCR reactions are required to capture the actual genetic diversity of a sample. Finally, the experiments confirm that processivity-enhanced polymerases enable a substantial decrease in PCR-mediated recombination through reducing starting template concentration, without compromising the robustness of PCR reactions.

PMID:
19852769
[PubMed - indexed for MEDLINE]
Free full text
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for Informa Healthcare, USA
    Loading ...
    Write to the Help Desk