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Streptococcus mutans  is a well-known cause of dental caries, due to its acidogenicity, aciduricity, and ability to synthesize exopolysaccharides in dental plaques. Intriguingly, not all children who carry  S. mutans  manifest caries, even with similar characteristics in oral hygiene, diet, and other environmental factors. This phenomenon suggests that host susceptibility potentially plays a role in the development of dental caries; however, the association between host genetics,  S. mutans , and dental caries remains unclear. Therefore, this study examined the influence of host gene-by- S. mutans  interaction on dental caries. Genome-wide association analyses were conducted in 709 US children (<13 years old), using the dbGap database acquired from the center for oral health research in appalachia (COHRA) and the Iowa Head Start programmes (GEIRS). A generalized estimating equation was used to examine the gene-by- S. mutans  interaction effects on the outcomes (decayed and missing/filled primary teeth due to caries). Sequentially, the COHRA and GEIRS data were used to identify potential interactions and replicate the findings. Three loci at the genes  interleukin 32  ( IL32), galactokinase 2 (GALK2) , and  CUGBP, Elav-like family member 4  ( CELF4)  were linked to  S. mutans  carriage, and there was a severity of caries at a suggestive significance level among COHRA children ( P  < 9 × 10 −5 ), and at a nominal significance level among GEIRS children ( P  = 0.047–0.001). The genetic risk score that combined the three loci also significantly interacted with  S. mutans  ( P  < 0.000 1). Functional analyses indicated that the identified genes are involved in the host immune response, galactose carbohydrate metabolism, and food-rewarding system, which could potentially be used to identify children at high risk for caries and to develop personalized caries prevention strategies.

international journal of oral science/international journal of oral science

Human genes influence the interaction between Streptococcus mutans and host caries susceptibility: a genome-wide association study in children with primary dentition