Molecular characterization of Salmonella Typhimurium isolated in Brazil by CRISPR-MVLST

Author(s)

Almeida, Fernanda ; Medeiros, Marta Ines Cazentini ; Rodrigues, Dalia dos Prazeres ; Allard, Marc W. ; Falcao, Juliana Pfrimer

• Document type: Journal article
• Source: Journal of Microbiological Methods; v. 133, p. 55-61, FEB 2017.
• Web of Science Citations: 15

Abstract

CRISPR-multi-locus virulence sequence typing (CRISPR-MVLST) was performed to type 92 S. Typhimurium strains isolated from humans and food sources between 1983 and 2013 in Brazil and assess the suitability of this methodology comparing it with PFGE already used for subtyping the same strains. Among the 92 S. Typhimurium strains studied, we identified 25 CRISPR1 alleles, 27 CRISPR2 alleles, 2fimH alleles and 3 sseL alleles showing that the genetic variability is much higher in the CRISPRs loci than in the virulence genes. The CRISPR-MVLST analysis provided similar results to the PFGE previously published used to type the same set of strains, demonstrating that CRISPR-MVLST is a very efficient approach for subtyping S. Typhimurium serovar and can be used to complement and validate results obtained by the PFGE methodology. (C) 2016 Elsevier B.V. All rights reserved. (AU)

• FAPESP's process: 12/19132-1 - Molecular characterization of Salmonella Typhimurium strains isolated from humans, food and animals in the Southeast and South regions of Brazil
• Grantee: Juliana Pfrimer Falcão
• Support Opportunities: Regular Research Grants