globalchange  > 气候变化与战略
DOI: 10.1073/pnas.0702196104
论文题名:
Fossil genes and microbes in the oldest ice on Earth
作者: Bidle K.D.; Lee S.; Marchant D.R.; Falkowski P.G.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2007
卷: 104, 期:33
起始页码: 13455
结束页码: 13460
语种: 英语
英文关键词: Ancient ice ; Community DNA ; Cosmic radiation ; Metabolism ; Metagenomic analysis
Scopus关键词: DNA ; ribosome DNA ; Antarctica ; article ; cell viability ; cosmic radiation ; fossil ; genetic variability ; genomics ; macromolecule ; metabolism ; microorganism ; nonhuman ; nucleotide sequence ; priority journal ; sea ; unindexed sequence ; Base Sequence ; DNA Primers ; DNA, Ribosomal ; Fossils ; Genes ; Ice ; Microscopy, Electron, Scanning ; Molecular Sequence Data ; Polymerase Chain Reaction ; Bacteria (microorganisms)
英文摘要: Although the vast majority of ice that formed on the Antarctic continent over the past 34 million years has been lost to the oceans, pockets of ancient ice persist in the Dry Valleys of the Transantarctic Mountains. Here we report on the potential metabolic activity of microbes and the state of community DNA in ice derived from Mullins and upper Beacon Valleys. The minimum age of the former is 100 ka, whereas that of the latter is ≈8 Ma, making it the oldest known ice on Earth. In both samples, radiolabeled substrates were incorporated into macromolecules, and microbes grew in nutrient-enriched melt-waters, but metabolic activity and cell viability were critically compromised with age. Although a 16S rDNA-based community reconstruction suggested relatively low bacterial sequence diversity in both ice samples, metagenomic analyses of community DNA revealed many diverse orthologs to extant metabolic genes. Analyses of five ice samples, spanning the last 8 million years in this region, demonstrated an exponential decline in the average community DNA size with a half-life of ≈1.1 million years, thereby constraining the geological preservation of microbes in icy environments and the possible exchange of genetic material to the oceans. © 2007 by The National Academy of Sciences of the USA.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162468
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作者单位: Bidle, K.D., Environmental Biophysics and Molecular Ecology Program, Institute of Marine and Coastal Sciences, Rutgers, the State University of New Jersey, New Brunswick, NJ 08901, United States; Lee, S., Environmental Biophysics and Molecular Ecology Program, Institute of Marine and Coastal Sciences, Rutgers, the State University of New Jersey, New Brunswick, NJ 08901, United States, Polar Research Institute, Korea Ocean Research and Development Institute, Incheon 406-840, South Korea; Marchant, D.R., Department of Earth Sciences, Boston University, Boston, MA 02215, United States; Falkowski, P.G., Environmental Biophysics and Molecular Ecology Program, Institute of Marine and Coastal Sciences, Rutgers, the State University of New Jersey, New Brunswick, NJ 08901, United States, Department of Geological Sciences, Rutgers, the State University of New Jersey, New Brunswick, NJ 08901, United States

Recommended Citation:
Bidle K.D.,Lee S.,Marchant D.R.,et al. Fossil genes and microbes in the oldest ice on Earth[J]. Proceedings of the National Academy of Sciences of the United States of America,2007-01-01,104(33)
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