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Journal of Bacteriology, November 2008, p. 7060-7067, Vol. 190, No. 21
0021-9193/08/$08.00+0     doi:10.1128/JB.01552-07
Copyright © 2008, American Society for Microbiology. All Rights Reserved.

Molecular Phylogeny of the Salmonellae: Relationships among Salmonella Species and Subspecies Determined from Four Housekeeping Genes and Evidence of Lateral Gene Transfer Events{triangledown} ,{dagger}

J. R. McQuiston,1,2 S. Herrera-Leon,3 B. C. Wertheim,4,{ddagger} J. Doyle,1,{ddagger} P. I. Fields,2 R. V. Tauxe,1,2 and J. M. Logsdon Jr.1,4*

Program in Population Biology, Ecology and Evolution, Emory University, Atlanta, Georgia 30322,1 Division of Foodborne, Bacterial and Mycotic Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia 30333,2 Laboratorio Nacional de Referencia de Salmonella y Shigella, Centro Nacional de Microbiologia, Instituto de Salud Carlos III, 28220 Majadahonda, Madrid, Spain,3 Department of Biology, Roy J. Carver Center for Comparative Genomics, University of Iowa, Iowa City, Iowa 522424

Received 26 September 2007/ Accepted 15 August 2008

The salmonellae are a diverse group of bacteria within the family Enterobacteriaceae that includes two species, Salmonella enterica and Salmonella bongori. In order to characterize the phylogenetic relationships of the species and subspecies of Salmonella, we analyzed four housekeeping genes, gapA, phoP, mdh and recA, comprising 3,459 bp of nucleotide sequence data for each isolate sequenced. Sixty-one isolates representing the most common serotypes of the seven subspecies of Salmonella enterica and six isolates of Salmonella bongori were included in this study. We present a robust phylogeny of the Salmonella species and subspecies that clearly defines the lineages comprising diphasic and monophasic subspecies. Evidence of intersubspecies lateral gene transfer of the housekeeping gene recA, which has not previously been reported, was obtained.

* Corresponding author. Mailing address: Department of Biology, Roy J. Carver Center for Comparative Genomics, University of Iowa, Iowa City, IA 52242. Phone: (319) 335-1082. Fax: (319) 335-1069. E-mail: john-logsdon{at}uiowa.edu

{triangledown} Published ahead of print on 29 August 2008.

{dagger} Supplemental material for this article may be found at http://jb.asm.org/.

{ddagger} B.C.W. and J.D. contributed equally to this study.

Journal of Bacteriology, November 2008, p. 7060-7067, Vol. 190, No. 21
0021-9193/08/$08.00+0     doi:10.1128/JB.01552-07
Copyright © 2008, American Society for Microbiology. All Rights Reserved.





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