Lactococcus garvieaeis a major pathogen for fish. Two complete (ATCC 49156 and Lg2) and three draft (UNIUD074, 8831, and 21881) genome sequences ofL. garvieaehave recently been released. We here present the results of a comparative genomic analysis of these fish and human isolates ofL. garvieae. The pangenome comprised 1,542 core and 1,378 dispensable genes. The sequencedL. garvieaestrains shared most of the possible virulence genes, but the capsule gene cluster was found only in fish-pathogenic strain Lg2. The absence of the capsule gene cluster in other nonpathogenic strains isolated from mastitis and vegetable was also confirmed by PCR. The fish and human isolates ofL. garvieaecontained the specific two and four adhesin genes, respectively, indicating that these adhesion proteins may be involved in the host specificity differences ofL. garvieae. The discoveries revealed by the pangenomic analysis may provide significant insights into the biology ofL. garvieae.
Comparative genomic analysis of Ralstonia solanacearum reveals candidate genes for host specificity
