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Evidence against reciprocal recombination as the basis for tuf gene conversion in Salmonella enterica serovar Typhimurium
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Cell and Molecular Biology.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Cell and Molecular Biology.
2004 (English)In: Journal of Molecular Biology, ISSN 0022-2836, E-ISSN 1089-8638, Vol. 338, no 3, 463-467 p.Article in journal (Refereed) Published
Abstract [en]

The duplicate tuf genes on the Salmonella enterica serovar Typhimurium chromosome co-evolve by a RecA-, RecB-dependent gene conversion mechanism. Gene conversion is defined as a non-reciprocal transfer of genetic information. However, in a replicating bacterial chromosome there is a possibility that a reciprocal genetic exchange between different tuf genes sitting on sister chromosomes could result in "apparent" gene conversion. We asked whether the major mechanism of tuf gene conversion was classical or apparent. We devised a genetic selection that allowed us to isolate and examine both expected products from a reciprocal recombination event between the tuf genes. Using this selection we tested within individual cultures for a correlation in the frequency of jackpots as expected if recombination were reciprocal. We found no correlation, either in the frequency of each type of recombinant product, or in the DNA sequences of the products resulting from each recombination event. We conclude that the evidence argues in favor of a non-reciprocal gene conversion mechanism as the basis for tuf gene co-evolution.

Place, publisher, year, edition, pages
2004. Vol. 338, no 3, 463-467 p.
Keyword [en]
Salmonella, tuf genes, reciprocal recombination, gene conversion, evolution
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:uu:diva-71593DOI: 10.1016/j.jmb.2004.03.002PubMedID: 15081805OAI: oai:DiVA.org:uu-71593DiVA: diva2:99504
Available from: 2005-05-10 Created: 2005-05-10 Last updated: 2017-11-21Bibliographically approved

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Hughes, Diarmaid

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