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Related Experiment Videos

Mutans streptococci in preschool twins.

P M A Corby1, W A Bretz, T C Hart

  • 1School of Dental Medicine, University of Pittsburgh, 380 Salk Hall, 3501 Terrace Street, Pittsburgh, Pennsylvania, 15261, USA.

Archives of Oral Biology
|March 3, 2005
PubMed
Summary

Genetic factors significantly influence salivary levels of mutans streptococci (MS) in preschool twins. Heritability is estimated at 52%, indicating a substantial genetic contribution to MS colonization.

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Area of Science:

  • Oral microbiology
  • Human genetics
  • Twin studies

Background:

  • Mutans streptococci (MS) are key pathogens in dental caries.
  • Understanding factors influencing MS colonization is crucial for caries prevention.
  • Twin studies are valuable for dissecting genetic and environmental influences.

Purpose of the Study:

  • To investigate the role of genetic factors in the variation of salivary MS levels.
  • To quantify the heritability of MS colonization in preschool children.

Main Methods:

  • Study included 48 monozygotic (MZ) and 54 dizygotic (DZ) twin pairs.
  • Zygosity determined by DNA genotyping; salivary MS levels assessed using the Stripmutanstrade mark test.
  • Data analyzed using regression analysis, t-tests, and structural equation modeling.

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Main Results:

  • Average salivary MS scores were significantly higher in MZ twins (1.1) compared to DZ twins (0.8) (p=0.021).
  • High MS levels (scores 2-3) were found in 42% of MZ twins versus 26% of DZ twins.
  • Heritability of MS colonization estimated at 52%, with non-shared environment contributing 48%.

Conclusions:

  • Genetic factors significantly contribute to the variation in salivary MS levels.
  • These findings highlight the importance of genetic predisposition in MS colonization.
  • Further research into specific genetic influences on MS carriage is warranted.