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Open Access Research article

Analysis of the genome content of Lactococcus garvieae by genomic interspecies microarray hybridization

Mónica Aguado-Urda1, Guillermo H López-Campos2, José F Fernández-Garayzábal13, Fernando Martín-Sánchez2, Alicia Gibello1, Lucas Domínguez3 and María M Blanco1*

Author Affiliations

1 Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad Complutense, 28040 Madrid, Spain

2 Área de Bioinformática y Salud Pública, Instituto de Salud Carlos III, 28220 Madrid, Spain

3 Centro de Vigilancia Sanitaria Veterinaria (VISAVET), Facultad de Veterinaria, Universidad Complutense, 28040 Madrid, Spain

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BMC Microbiology 2010, 10:79  doi:10.1186/1471-2180-10-79

Published: 16 March 2010

Abstract

Background

Lactococcus garvieae is a bacterial pathogen that affects different animal species in addition to humans. Despite the widespread distribution and emerging clinical significance of L. garvieae in both veterinary and human medicine, there is almost a complete lack of knowledge about the genetic content of this microorganism. In the present study, the genomic content of L. garvieae CECT 4531 was analysed using bioinformatics tools and microarray-based comparative genomic hybridization (CGH) experiments. Lactococcus lactis subsp. lactis IL1403 and Streptococcus pneumoniae TIGR4 were used as reference microorganisms.

Results

The combination and integration of in silico analyses and in vitro CGH experiments, performed in comparison with the reference microorganisms, allowed establishment of an inter-species hybridization framework with a detection threshold based on a sequence similarity of ≥ 70%. With this threshold value, 267 genes were identified as having an analogue in L. garvieae, most of which (n = 258) have been documented for the first time in this pathogen. Most of the genes are related to ribosomal, sugar metabolism or energy conversion systems. Some of the identified genes, such as als and mycA, could be involved in the pathogenesis of L. garvieae infections.

Conclusions

In this study, we identified 267 genes that were potentially present in L. garvieae CECT 4531. Some of the identified genes could be involved in the pathogenesis of L. garvieae infections. These results provide the first insight into the genome content of L. garvieae.