4.3 Article

Contamination of diverse nifH and nifH-like DNA into commercial PCR primers

期刊

FEMS MICROBIOLOGY LETTERS
卷 246, 期 1, 页码 33-38

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OXFORD UNIV PRESS
DOI: 10.1016/j.femsle.2005.03.042

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contamination; nifH; PCR; primer

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False-positive results due to DNA contamination in PCR reagents have become a big problem in the amplification of small amounts of DNA. Recently, it was revealed that PCR reagents were contaminated with the nifH (dinitrogenase reductase) gene. We found that the PCR primers supplied by some manufacturers contained nifH gene and nifH-like DNA. This contamination resulted in false-positive results when searching for nifH genes in environmental samples. The sequences of the contaminating DNA appeared to be widely varied in the phylogenetic analysis of nifH. For this reason, great care should be taken when analyzing trace amounts of nucleotides. (c) 2005 Federation of European Microbiological Societies. Published by Elsevier B.V. All rights reserved.

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