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Journal of Dental Research
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Biological

Differential and Quantitative Analyses of mRNA Expression of Glucosyltransferases from Streptococcus mutans MT8148

T. Fujiwara1,*, T. Hoshino1, T. Ooshima1 and S. Hamada2

1 Departments of Pedodontics and
2 Oral Microbiology, Osaka University Graduate School of Dentistry, 1-8, Yamadaoka, Suita-Osaka, 565-0871, Japan;

Correspondence: *corresponding author, fujiwara{at}dent.osaka-u.ac.jp

Streptococcus mutans produces three glucosyltransferases, coded by gtfB, gtfC, and gtfD, whose cooperative action is essential for sucrose-dependent cellular adhesion. This cellular adhesion plays an important role in the formation of dental plaque and the initiation of dental caries. Since they bear genetic similarities and are large in size, differentiation of their gene expression has been difficult, and little is known about the dynamic process of gtf expression. Using a real-time reverse-transcription/polymerase chain-reaction, we determined the expression of each gtf. Under various conditions, the relative levels of transcription were gtfB > gtfD > gtfC. Sucrose enhanced gtfD expression, whereas it reduced that of gtfB and gtfC, suggesting the presence of independent promoters. Quantitative analyses demonstrated coincidence between the ratio of expression of each gtf and the ratio previously identified as optimal for sucrose-dependent adhesion in vitro, suggesting that S. mutans produces GTF at an optimal ratio to adhere to the tooth surface.

Key Words: glucosyltransferase • Streptococcus mutans • real-time RT-PCR • gene expression

Journal of Dental Research, Vol. 81, No. 2, 109-113 (2002)
DOI: 10.1177/154405910208100205
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