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Assessment of Bias Associated with Incomplete Extraction of Microbial DNA from Soil

Open access
Feinstein, Larry M., Sul, Woo Jun, Blackwood, Christopher B.·2009·Applied and Environmental Microbiology

Abstract

DNA extraction bias is a frequently cited but poorly understood limitation of molecular characterizations of environmental microbial communities. To assess the bias of a commonly used soil DNA extraction kit, we varied the cell lysis protocol and conducted multiple extractions on subsamples of clay, sand, and organic soils. DNA, as well as bacterial and fungal ribosomal gene copies as measured by quantitative PCR, continued to be isolated in successive extractions. When terminal restriction fragment length polymorphism was used, a significant shift in community composition due to extraction bias was detected for bacteria but not for fungi. Pyrosequencing indicated that the relative abundances of sequences from rarely cultivated groups such as Acidobacteria,Gemmatimonades, and Verrucomicrobia were higher in the first extraction than in the sixth but that the reverse was true for Proteobacteria and Actinobacteria. This suggests that the well-known phylum-level bacterial cultivation bias may be partially exaggerated by DNA extraction bias. We conclude that bias can be adequately reduced in many situations by pooling three successive extractions, and additional measures should be considered when divergent soil types are compared or when comprehensive community analysis is necessary.

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Metadata

Authors
Feinstein, L. M., Sul, W. J., & Blackwood, C. B.
Venue
Applied and Environmental Microbiology
Published
2009-08-15
Volume
75
Issue
16
Pages
5428-5433
ISSN
  • 0099-2240 (ISSN-L)
  • 1098-5336
OpenAlex
W2140319224
Cited by
313
References
28
FWCI
20.54
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: Assessment of Bias Associated with Incomplete Extraction of Microbial DNA from Soil. https://app.cochat.ai/papers/10.1128/aem.00120-09
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Feinstein, L. M., Sul, W. J., & Blackwood, C. B. (2009). Assessment of Bias Associated with Incomplete Extraction of Microbial DNA from Soil. Applied and Environmental Microbiology. https://doi.org/10.1128/aem.00120-09

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