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Estimated Minimal Divergence Times of the Major Bacterial and Archaeal Phyla

Estimated Minimal Divergence Times of the Major Bacterial and Archaeal Phyla Previous calibrations of prokaryotic phylogenetic events were based on the vertebrate fossil record because a detailed microbial fossil record does not exist. Recently, compounds (2-methylhopanoids) that are found in cyanobacterial membranes were identified among compounds extracted from late Archean sedimentary rocks. These lipids establish a minimum time, 2.65 Ga (Billion Years Ago), in the geologic record for the existence of cyanobacteria. We have used this new information to calibrate a Neighbor Joining distance tree generated from SSU rRNA sequences of major prokaryotic lineages and to estimate the dates for significant events in the history of life on Earth. The results suggest that the Last Common Ancestor occurred at about 4.29 Ga and that the individual Bacterial and Archaeal Domains began radiating about 3.46 Ga. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Geomicrobiology Journal Taylor & Francis

Estimated Minimal Divergence Times of the Major Bacterial and Archaeal Phyla

14 pages

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References (64)

Publisher
Taylor & Francis
Copyright
Copyright Taylor & Francis Group, LLC
ISSN
1521-0529
eISSN
0149-0451
DOI
10.1080/01490450303891
Publisher site
See Article on Publisher Site

Abstract

Previous calibrations of prokaryotic phylogenetic events were based on the vertebrate fossil record because a detailed microbial fossil record does not exist. Recently, compounds (2-methylhopanoids) that are found in cyanobacterial membranes were identified among compounds extracted from late Archean sedimentary rocks. These lipids establish a minimum time, 2.65 Ga (Billion Years Ago), in the geologic record for the existence of cyanobacteria. We have used this new information to calibrate a Neighbor Joining distance tree generated from SSU rRNA sequences of major prokaryotic lineages and to estimate the dates for significant events in the history of life on Earth. The results suggest that the Last Common Ancestor occurred at about 4.29 Ga and that the individual Bacterial and Archaeal Domains began radiating about 3.46 Ga.

Journal

Geomicrobiology JournalTaylor & Francis

Published: Jan 1, 2003

Keywords: 16s Rrna; Bacteriohopanepolyols; Divergence; Phylogeny; Prokaryotes

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