| Molecular identification of cyanobacteria associated with stromatolites from distinct geographical locations. | |
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MedLine Citation:
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PMID: 12530237 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Modern stromatolites represent a significant resource for studying microbial ecology and evolution. A preliminary investigation was undertaken employing specific genetic probes to characterize the cyanobacteria responsible for stromatolite construction in a range of environments, including microbial mats found in Australia not previously examined with molecular methods. Isolates of cyanobacteria were collected from stromatolites in thermal springs, hypersaline lakes, and oceanic fringes on two continents. A polymerase chain reaction specific for DNA of cyanobacterial 16S rRNA was developed, the resulting products of the DNA amplification reaction were sequenced, and the data were used to infer relatedness between the isolates studied and other members of the cyanobacterial radiation. Complete sequence was generated for the region from position 27 to 408 for 13 strains of cyanobacteria associated with stromatolites. All stromatolite-derived sequences were most closely related to cyanobacteria, as indicated by local sequence alignment. It was possible to correlate genetic identity with morphological nomenclatures and to expand the phylogeny of benthic cyanobacteria. These inferences were also expanded to temporal variation in the dominant resident cyanobacterial species based on sampling of surface and core sinter laminations. Under the methods employed, only one cyanobacterial strain was detected in each sample, suggesting the possible dominance of a specific clonal population of cyanobacteria at any one time in the biota of the samples tested. The data indicate that internal core samples of a stromatolite at least 10 years old can be successfully analyzed by DNA-based methods to identify preserved cyanobacteria. |
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Authors:
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Brett A Neilan; Brendan P Burns; David A Relman; Donald R Lowe |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: Astrobiology Volume: 2 ISSN: 1531-1074 ISO Abbreviation: Astrobiology Publication Date: 2002 |
Date Detail:
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Created Date: 2003-01-17 Completed Date: 2003-07-16 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 101088083 Medline TA: Astrobiology Country: United States |
Other Details:
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Languages: eng Pagination: 271-80 Citation Subset: IM |
Affiliation:
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Departments of Geological and Environmental Sciences and Microbiology and Immunology, Stanford University, Stanford, California, USA. b.neilan@unsw.edu.au |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Base Sequence Cyanobacteria / classification*, genetics DNA Primers Geography Phylogeny Polymerase Chain Reaction RNA, Ribosomal, 16S / genetics |
| Chemical | |
Reg. No./Substance:
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0/DNA Primers; 0/RNA, Ribosomal, 16S |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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