Polymorphism of eps loci in Streptococcus thermophilus: sequence replacement by putative horizontal transfer in S. thermophilus IP6757

The phylogenetic relationships between 26 Streptococcus thermophilus strains were investigated by hybridization of 15 DNA probes. They indicate that IP6757 and NST2280 strains are genetically very closely related. They are included in a group of eight closely related strains which contain identical...

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Bibliographic Details
Published in:International dairy journal 2004-07, Vol.14 (7), p.627-634
Main Authors: Pluvinet, Arnaud, Charron-Bourgoin, Florence, Morel, Catherine, Decaris, Bernard
Format: Article
Language:English
Subjects:
Agricultural sciences
Biological and medical sciences
Exopolysaccharide
Food industries
Food microbiology
Fundamental and applied biological sciences. Psychology
Horizontal transfer
Lactic acid bacteria
Life Sciences
Milk and cheese industries. Ice creams
Phylogenetic relationships
Polymorphism
Sequence comparison
Sequence replacement
Streptococcus thermophilus
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Summary:The phylogenetic relationships between 26 Streptococcus thermophilus strains were investigated by hybridization of 15 DNA probes. They indicate that IP6757 and NST2280 strains are genetically very closely related. They are included in a group of eight closely related strains which contain identical eps loci, apart from IP6757 which possesses a different one. The IP6757 and NST2280 eps loci contain identical epsA– epsD region whereas the remainder of the loci are completely different in size and sequence. The IP6757 genes are conserved in only one of the 26 S. thermophilus strains tested, LMG18311. The IP6757 eps locus could result from sequence replacement and the new sequence may have been acquired by putative horizontal transfer. Hybridization data and sequence comparison of IP6757 and NST2280 eps loci with those of other S. thermophilus strains show that eps loci are highly variable and could quickly evolve by sequence replacement.
ISSN:0958-6946
1879-0143
DOI:10.1016/j.idairyj.2003.12.009