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Bioinformatics Advance Access originally published online on November 22, 2005
Bioinformatics 2006 22(9):1072-1079; doi:10.1093/bioinformatics/bti793
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Describing ancient horizontal gene transfers at the nucleotide and gene levels by comparative pathogenicity island genometrics

F. Collyn 1,2, L. Guy 2, M. Marceau 1, M. Simonet 1 and C.-A. H. Roten 2,*

1 Inserm E0364—Université de Lille II, Faculté de Médecine Henri Warembourg, Institut Pasteur de Lille 1 rue du Pr Calmette, F-59021 Lille, France
2 Département de Microbiologie Fondamentale, Bâtiment de Biologie, Faculté de Biologie et de Médecine, Université de Lausanne CH-1015 Dorigny, Switzerland

*To whom correspondence should be addressed.

Motivation: Lateral gene transfer is a major mechanism contributing to bacterial genome dynamics and pathovar emergence via pathogenicity island (PAI) spreading. However, since few of these genomic exchanges are experimentally reproducible, it is difficult to establish evolutionary scenarios for the successive PAI transmissions between bacterial genera. Methods initially developed at the gene and/or nucleotide level for genomics, i.e. comparisons of concatenated sequences, ortholog frequency, gene order or dinucleotide usage, were combined and applied here to homologous PAIs: we call this approach comparative PAI genometrics.

Results: YAPI, a Yersinia PAI, and related islands were compared with measure evolutionary relationships between related modules. Through use of our genometric approach designed for tracking codon usage adaptation and gene phylogeny, an ancient inter-genus PAI transfer was oriented for the first time by characterizing the genomic environment in which the ancestral island emerged and its subsequent transfers to other bacterial genera.

Contact: claude-alain.roten{at}unil.ch

Supplementary information: http://www.unil.ch/comparativegenometrics/collyn_et_al_2005/collyn.htm

Received on July 27, 2005; revised on October 18, 2005; accepted on November 15, 2005

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