Obscured phylogeny and possible recombinational dormancy in Escherichia coli View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2011-12

AUTHORS

Shana R Leopold, Stanley A Sawyer, Thomas S Whittam, Phillip I Tarr

ABSTRACT

BACKGROUND: Escherichia coli is one of the best studied organisms in all of biology, but its phylogenetic structure has been difficult to resolve with current data and analytical techniques. We analyzed single nucleotide polymorphisms in chromosomes of representative strains to reconstruct the topology of its emergence. RESULTS: The phylogeny of E. coli varies according to the segment of chromosome analyzed. Recombination between extant E. coli groups is largely limited to only three intergroup pairings. CONCLUSIONS: Segment-dependent phylogenies most likely are legacies of a complex recombination history. However, E. coli are now in an epoch in which they no longer broadly share DNA. Using the definition of species as organisms that freely exchange genetic material, this recombinational dormancy could reflect either the end of E. coli as a species, or herald the coalescence of E. coli groups into new species. More... »

PAGES

183

Identifiers

URI

http://scigraph.springernature.com/pub.10.1186/1471-2148-11-183

DOI

http://dx.doi.org/10.1186/1471-2148-11-183

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1019890073

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/21708031


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54 schema:description BACKGROUND: Escherichia coli is one of the best studied organisms in all of biology, but its phylogenetic structure has been difficult to resolve with current data and analytical techniques. We analyzed single nucleotide polymorphisms in chromosomes of representative strains to reconstruct the topology of its emergence. RESULTS: The phylogeny of E. coli varies according to the segment of chromosome analyzed. Recombination between extant E. coli groups is largely limited to only three intergroup pairings. CONCLUSIONS: Segment-dependent phylogenies most likely are legacies of a complex recombination history. However, E. coli are now in an epoch in which they no longer broadly share DNA. Using the definition of species as organisms that freely exchange genetic material, this recombinational dormancy could reflect either the end of E. coli as a species, or herald the coalescence of E. coli groups into new species.
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