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Evolution of Cariogenic Character in Streptococcus mutans: Horizontal Transmission of Glycosyl Hydrolase Family 70 Genes

Identifieur interne : 000464 ( Main/Merge ); précédent : 000463; suivant : 000465

Evolution of Cariogenic Character in Streptococcus mutans: Horizontal Transmission of Glycosyl Hydrolase Family 70 Genes

Auteurs : Tomonori Hoshino [Japon] ; Taku Fujiwara [Japon] ; Shigetada Kawabata [Japon]

Source :

RBID : PMC:3399136

Abstract

Acquisition of the ability to produce polysaccharides from sucrose, i.e. the gtf gene encoding glucosyltransferase (GTF), is the key evolutionary event enabling dental biofilm formation by streptococci. To clarify the ancestry of streptococcal GTFs, time of its occurrence, and order of specific events, we investigated the distribution of GTFs among bacteria by phylogenetic analysis of the glycosyl hydrolase family 70 enzymes. We found that streptococcal GTFs were derived from other lactic acid bacteria such as Lactobacillus and Leuconostoc, and propose the following evolutionary model: horizontal gene transfer via transposons occurred when streptococci encountered lactic acid bacteria contained in fermented food. Intra-genomic gene duplication occurred by a secondary selection pressure such as consumption of refined sugar. Our findings concerning this evolution in Streptococcus mutans provide an important background for studies of the relationship between the historical spread of dental caries and anthropological factors.


Url:
DOI: 10.1038/srep00518
PubMed: 22816041
PubMed Central: 3399136

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PMC:3399136

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gene encoding glucosyltransferase (GTF), is the key evolutionary event enabling dental biofilm formation by streptococci. To clarify the ancestry of streptococcal GTFs, time of its occurrence, and order of specific events, we investigated the distribution of GTFs among bacteria by phylogenetic analysis of the glycosyl hydrolase family 70 enzymes. We found that streptococcal GTFs were derived from other lactic acid bacteria such as
<italic>Lactobacillus</italic>
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<italic>Leuconostoc,</italic>
and propose the following evolutionary model: horizontal gene transfer via transposons occurred when streptococci encountered lactic acid bacteria contained in fermented food. Intra-genomic gene duplication occurred by a secondary selection pressure such as consumption of refined sugar. Our findings concerning this evolution in
<italic>Streptococcus mutans</italic>
provide an important background for studies of the relationship between the historical spread of dental caries and anthropological factors.</p>
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