Genome-wide study of the defective sucrose fermenter strain of vibrio cholerae from the Latin American cholera epidemic

Daniel Rios Garza, Cristiane C. Thompson, Edvaldo Carlos Brito Loureiro, Bas E. Dutilh, Davi Toshio Inada, Edivaldo Costa Sousa Junior, Jedson Ferreira Cardoso, Márcio Roberto T. Nunes, Clayton Pereira Silva de Lima, Rodrigo Vellasco Duarte Silvestre, Keley Nascimento Barbosa Nunes, Elisabeth C.O. Santos, Robert A. Edwards, Ana Carolina P. Vicente, Lena Lillian Canto de Sá Morais

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

The 7th cholera pandemic reached Latin America in 1991, spreading from Peru to virtually all Latin American countries. During the late epidemic period, a strain that failed to ferment sucrose dominated cholera outbreaks in the Northern Brazilian Amazon region. In order to understand the genomic characteristics and the determinants of this altered sucrose fermenting phenotype, the genome of the strain IEC224 was sequenced. This paper reports a broad genomic study of this strain, showing its correlation with the major epidemic lineage. The potentially mobile genomic regions are shown to possess GC content deviation, and harbor the main V. cholera virulence genes. A novel bioinformatic approach was applied in order to identify the putative functions of hypothetical proteins, and was compared with the automatic annotation by RAST. The genome of a large bacteriophage was found to be integrated to the IEC224's alanine aminopeptidase gene. The presence of this phage is shown to be a common characteristic of the El Tor strains from the Latin American epidemic, as well as its putative ancestor from Angola. The defective sucrose fermenting phenotype is shown to be due to a single nucleotide insertion in the V. cholerae sucrose-specific transportation gene. This frame-shift mutation truncated a membrane protein, altering its structural pore-like conformation. Further, the identification of a common bacteriophage reinforces both the monophyletic and African-Origin hypotheses for the main causative agent of the 1991 Latin America cholera epidemics.

Original languageEnglish
Article numbere37283
JournalPLoS One
Volume7
Issue number5
DOIs
Publication statusPublished - 25 May 2012
Externally publishedYes

Bibliographical note

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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