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PMID: 16322518 Published · ppublish English Comparative Study Journal Article Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S.

Recombination in Thermotoga: implications for species concepts and biogeography.

Genetics ·Vol. 172 ·No. 2 ·2006-02-00 ·Pages 759-69

Nesbø CL, Dlutek M, Doolittle WF

Abstract

Here we characterize regions of the genomes of eight members of the hyperthermophilic genus Thermotoga. These bacteria differ from each other physiologically and by 3-20% in gene content and occupy physically distinct environments in widely disparate regions of the globe. Among the four different lineages (represented by nine different strains) that we compare, no two are closer than 96% in the average sequences of their genes. By most accepted recent definitions these are different "ecotypes" and different "species." And yet we find compelling evidence for recombination between them. We suggest that no single prokaryotic species concept can accommodate such uncoupling of ecotypic and genetic aspects of cohesion and diversity, and that without a single concept, the question of whether or not prokaryotic species might in general be cosmopolitan cannot be sensibly addressed. We can, however, recast biogeographical questions in terms of the distribution of genes and their alleles.

MeSH Terms
Base Sequence Genes, Bacterial Genetic Speciation Genomics Genotype Likelihood Functions Molecular Sequence Data Multigene Family Phenotype Phylogeny Recombination, Genetic Sequence Alignment Species Specificity Thermotoga maritima/genetics,isolation & purification,physiology Thermotoga neapolitana/genetics,isolation & purification,physiology Water Microbiology
Authors & Affiliations
3 authors, click to expand affiliations / ORCID
Nesbø Camilla L
Department of Biochemistry and Molecular Biology, Dalhousie University, Halifax, Nova Scotia B3H 1X5, Canada. [email protected]
Dlutek Marlena
Doolittle W Ford
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Article Info
Journal
Genetics
Abbr.
Genetics
ISSN
0016-6731
DOI
10.1534/genetics.105.049312
Email
[email protected]
Published
2006-02-00
Epub
2005-00-01
Pages
759-69
Language
English
Region
United States
NLM ID
0374636
PMCID
PMC1456242
Subset
IM
Databases
GENBANK
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PubMed source DOI: 10.1534/genetics.105.049312 PMC Full Text View journal details
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