High abundance of ammonia-oxidizing Archaea in coastal waters, determined using a modified DNA extraction method.

Applied and Environmental Microbiology
Hidetoshi UrakawaDavid A Stahl

Abstract

Molecular characterizations of environmental microbial populations based on recovery and analysis of DNA generally assume efficient or unbiased extraction of DNA from different sample matrices and microbial groups. Appropriate controls to verify this basic assumption are rarely included. Here three different DNA extractions, performed with two commercial kits (FastDNA and UltraClean) and a standard phenol-chloroform method, and two alternative filtration methods (Sterivex and 25-mm-diameter polycarbonate filters) were evaluated, using the addition of Nitrosopumilus maritimus cells to track the recovery of DNA from marine Archaea. After the comparison, a simplified phenol-chloroform extraction method was developed and shown to be significantly superior, in terms of both the recovery and the purity of DNA, to other protocols now generally applied to environmental studies. The simplified and optimized method was used to quantify ammonia-oxidizing Archaea at different depth intervals in a fjord (Hood Canal) by quantitative PCR. The numbers of Archaea increased with depth, often constituting as much as 20% of the total bacterial community.

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Citations

Jul 17, 2012·Environmental Science & Technology·Ameet J PintoLutgarde Raskin
Nov 15, 2011·Microbes and Environments·Chiachi HwangWen-Tso Liu
Aug 13, 2014·Proceedings of the National Academy of Sciences of the United States of America·Wei QinDavid A Stahl
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