Genetic exchange across a species boundary in the Archaeal genus Ferroplasma

Eppley, John M., Tyson, Gene W., Getz, Wayne M. and Banfield, Jillian F. (2007) Genetic exchange across a species boundary in the Archaeal genus Ferroplasma. Genetics, 177 1: 407-416. doi:10.1534/genetics.107.072892

Author Eppley, John M.
Tyson, Gene W.
Getz, Wayne M.
Banfield, Jillian F.
Title Genetic exchange across a species boundary in the Archaeal genus Ferroplasma
Journal name Genetics   Check publisher's open access policy
ISSN 0016-6731
Publication date 2007-09-01
Year available 2007
Sub-type Article (original research)
DOI 10.1534/genetics.107.072892
Open Access Status Not yet assessed
Volume 177
Issue 1
Start page 407
End page 416
Total pages 10
Place of publication Austin, Texas, U.S.
Publisher Genetics Society of America
Language eng
Subject 0305 Organic Chemistry
0304 Medicinal and Biomolecular Chemistry
06 Biological Sciences
0603 Evolutionary Biology
Abstract Speciation as the result of barriers to genetic exchange is the foundation for the general biological species concept. However, the relevance of genetic exchange for defining microbial species is uncertain. In fact, the extent to which microbial populations comprise discrete clusters of evolutionarily related organisms is generally unclear. Metagenomic data from an acidophilic microbial community enabled a genomewide, comprehensive investigation of variation in individuals from two coexisting natural archaeal populations. Individuals are clustered into species-like groups in which cohesion appears to be maintained by homologous recombination. We quantified the dependence of recombination frequency on sequence similarity genomewide and found a decline in recombination with increasing evolutionary distance. Both inter- and intralineage recombination frequencies have a log-linear dependence on sequence divergence. In the declining phase of interspecies genetic exchange, recombination events cluster near the origin of replication and are localized by tRNAs and short regions of unusually high sequence similarity. The breakdown of genetic exchange with increasing sequence divergence could contribute to, or explain, the establishment and preservation of the observed population clusters in a manner consistent with the biological species concept.
Keyword Genes
Q-Index Code C1
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Chemistry and Molecular Biosciences
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Created: Tue, 22 Dec 2009, 20:05:22 EST by Macushla Boyle on behalf of Faculty of Science