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Hočevar, Luka; Kovač, Jernej; Podkrajšek, Katarina Trebušak; Battelino, Saba; Pavlič, Alenka
Archives of oral biology, October 2020, 2020-Oct, 2020-10-00, 20201001, Letnik: 118Journal Article
•There is no clear evidence for a specific MIH aetiological factor.•Genetic variation may be an important contributing factor for MIH development.•The results of this study suggest that the rs2245803 variant of the MMP20 gene may influence the development of MIH. The present study searched for evidence of possible associations between some genetic factors that could affect the development of molar–incisor hypomineralisation (MIH). In 113 patients who were surgically treated at an Otorhinolaryngology and Cervicofacial Surgery Clinic (ORL) during early childhood, human leukocyte antigen (HLA) DQ2 and DQ8 haplotypes and single nucleotide polymorphisms (SNP) of eight amelogenesis-related genes were searched in genomic DNA. Genotypes were determined by high resolution melting (HRM), TaqMan genotyping assays, and Sanger sequencing. Association between MIH and the HLA DQ2 and DQ8 alleles was tested using a univariate logistic regression. The significance of genetic variants was analysed using the Cochran–Armitage tests for trend and the Fisher exact tests. We identified MIH in 22 (19.5 %) of the 113 children. Among the evaluated genetic variants, SNP rs2245803 in the MMP20 gene in a homozygous form in a recessive model was associated with MIH development (OR, 2.796; 95 %CI, 1.075 − 4.783; p = 0.0496) with the genotype distribution of TT(3), TG(6) or GG(13) in children with MIH and distribution of TT(18), TG(42) or GG(31) in children without MIH. While the aetiology of MIH remains unclear, our findings suggest that variants of genes associated with amelogenesis may play important roles in susceptibility to MIH.
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