Key Laboratory of Veterinary Public Health of Ministry of Agriculture

Lanzhou, China

Key Laboratory of Veterinary Public Health of Ministry of Agriculture

Lanzhou, China
SEARCH FILTERS
Time filter
Source Type

Li X.,State Key Laboratory of Veterinary Etiological Biology | Li X.,Key Laboratory of Veterinary Public Health of Ministry of Agriculture | Li X.,Lanzhou Veterinary Research Institute | Xing J.,State Key Laboratory of Veterinary Etiological Biology | And 12 more authors.
Molecular Phylogenetics and Evolution | Year: 2013

Horizontal gene transfer (HGT) is an important evolutionary mechanism that has shaped prokaryotic genomes. For Streptococcus thermophilus, there is no direct evidence that the bacteria might acquire a second paralog from a different origin in the same niche. In this study, we found that four isolates of S. thermophilus (B, C, E and F) from the same yoghurt contained two putative homologs of the eno genes (eno-1 and eno-2) and two putative homologs of the guaB genes (guaB-1 and guaB-2). Both eno-1 and guaB-1 shared 100% nucleotide identity among the four isolates, and with isolate A and S. thermophilus ND03. Phylogenetic and nucleotide divergence analyses indicated that guaB-2 of these isolates may have been acquired from species in the genus Streptococcus, while eno-2 of isolates B and C may have been acquired from a donor in the genus Streptococcus. The eno-2 genes of isolates E and F may have been acquired from a donor in the Enterococcus genera. Relative synonymous codon usage analysis confirmed the eno-2 genes of isolates E and F as being acquired from a donor in genus Enterococcus. This study provides evidence that interfamily and interspecies HGT occur in S. thermophilus strains isolated from the same niche. © 2013 Elsevier Inc.

Loading Key Laboratory of Veterinary Public Health of Ministry of Agriculture collaborators
Loading Key Laboratory of Veterinary Public Health of Ministry of Agriculture collaborators