Abstract
Genetics is an important component in the determination of individual susceptibility to caries and periodontal diseases. Since beta defensin 1 (DEFB1) localizes in the oral cavity, we tested if variation in DEFB1 is associated with caries and periodontitis. We analyzed 3 single-nucleotide polymorphisms in DEFB1 in DNA samples from unrelated individuals. Carrying a copy of the variant allele of the DEFB1 marker rs11362 (G-20A) increased the DMFT and DMFS scores more than five-fold. Also, carrying a copy of the variant allele of the DEFB1 marker rs179946 (G-52A) correlated with low DMFT scores. We found a high-caries-experience haplotype (GCA), which increased DMFT scores two-fold, and a low- caries-experience haplotype (ACG), which decreased DMFT scores two-fold, in the DEFB1 promoter. No association between DEFB1 genetic markers and periodontal disease was found. Our results suggest that functional polymorphisms of DEFB1 are potential markers for caries.
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