Isotopic ratio outlier analysis global metabolomics of Caenorhabditis elegans.

Isotopic ratio outlier analysis global metabolomics of Caenorhabditis elegans.
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DOI:
10.1021/ac4025413
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发表时间:
2013-12-17
影响因子:
7.4
通讯作者:
Edison, Arthur S.
Edison, Arthur S.
中科院分区:
化学1区
文献类型:
--
作者:
Stupp, Gregory S.;Clendinen, Chaevien S.;Ajredini, Ramadan;Szewc, Mark A.;Garret, Timothy;Menger, Robert F.;Yost, Richard A.;Beecher, Chris;Edison, Arthur S.

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We demonstrate the global metabolic analysis of Caenorhabditis elegans stress responses using a mass spectrometry-based technique called Isotopic Ratio Outlier Analysis (IROA). In an IROA protocol, control and experimental samples are isotopically labeled with 95% and 5% 13C, and the two sample populations are mixed together for uniform extraction, sample preparation, and LC-MS analysis. This labeling strategy provides several advantages over conventional approaches: 1) compounds arising from biosynthesis are easily distinguished from artifacts, 2) errors from sample extraction and preparation are minimized because the control and experiment are combined into a single sample, 3) measurement of both the molecular weight and the exact number of carbon atoms in each molecule provides extremely accurate molecular formulae, and 4) relative concentrations of all metabolites are easily determined. A heat shock perturbation was conducted on C. elegans to demonstrate this approach. We identified many compounds that significantly changed upon heat shock, including several from the purine metabolism pathway, which we use to demonstrate the approach. The metabolomic response information by IROA may be interpreted in the context of a wealth of genetic and proteomic information available for C. elegans. Furthermore, the IROA protocol can be applied to any organism that can be isotopically labeled, making it a powerful new tool in a global metabolomics pipeline.
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