DNA buoyant density shifts during 15N-DNA stable isotope probing.

DNA buoyant density shifts during 15N-DNA stable isotope probing. Research Abstract Details 

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DNA buoyant density shifts during 15N-DNA stable isotope probing. Abstract Text:

Alison M Cupples,Elizabeth A Shaffer,Joanne C Chee-Sanford,Gerald K Sims,Alison M Cupples,Elizabeth A Shaffer,Joanne C Chee-Sanford,Gerald K Sims,

DNA-based stable isotope probing (SIP) is a novel technique for the identification of organisms actively assimilating isotopically labeled compounds. Herein, we define the limitations to using 15N-labeled substrates for SIP and propose modifications to compensate for these shortcomings. Changes in DNA buoyant density (BD) resulting from 15N incorporation were determined using cultures of disparate GC content (Escherichia coli and Micrococcus luteus). Incorporation of 15N into DNA increased BD by 0.015+/-0.002 g mL(-1) for E. coli and 0.013+/-0.002 g mL(-1) for M. luteus. The DNA BD shift was greatly increased (0.045 g mL(-1)) when dual isotope (13C plus 15N) labeling was employed. Despite the limited DNA BD shift following 15N enrichment, we found the use of gradient fractionation, followed by a comparison of T-RFLP profiles from fractions of labeled and control treatments, facilitated detection of enrichment in DNA samples from either cultures or soil.

DNA buoyant density shifts during 15N-DNA stable isotope probing. Publishing Authors By Initials

AM Cupples,EA Shaffer,JC Chee-Sanford,GK Sims,AM Cupples,EA Shaffer,JC Chee-Sanford,GK Sims,

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DNA buoyant density shifts during 15N-DNA stable isotope probing. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Microbiological research

VOLUME: 162

Page Numbers: 328-34

Journal Abbreviation: Microbiol. Res.

ISSN: 0944-5013

DAY: 24

MONTH: 03

YEAR: 2006

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LANGUAGE: eng

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AFFILIATION: United States Department of Agriculture-Agricultural Research Service, University of Illinois at Urbana-Champaign, S-306 Turner Hall, 1102 S. Goodwin Ave., Urbana, IL 61801, USA. cupplesa@msu.edu

Country: Germany

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MEDLINETA: Microbiol Res

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