ABSTRACT
To evaluate the effects of rs1799750 1G/2G polymorphism of the MMP1 gene and rs1800470 T/C polymorphism of the TGF-ß1 gene on temporomandibular disk displacement and vertical facial development.
Sixty-six individuals were examined radiographically prior to evaluation of the signs/symptoms of temporomandibular disorders according to the Research Diagnostic Criteria for Temporomandibular Disorders (RDC/TMD). Class II, hyperdivergent individuals with TMD (+) were assigned to Group 1, and individuals with TMD (−) were included in Group 2; while Class I, normodivergent individuals with TMD (−) were included in Group 3. For genetic analysis, oral mucosa swab samples were collected, and genotype analysis was performed.
The incidence of 2G alleles in Group 2 (72.7%) was significantly higher than the other groups (P < .05). ANB angle and mean Wits of the 1G/1G genotype of the MMP1 gene were significantly lower than 1G/2G and 2G/2G. Mean Go-Gn of the 1G/1G genotype was significantly higher than that of 1G/2G. The mean SNB of the TGF-β1 TT genotype was significantly higher than TC. The mean Co-Gn of TT was significantly higher than CC.
A relationship was found between the 2G allele of rs1799750 1G/2G polymorphisms of the MMP1 gene and the risk of individuals developing disk displacement. Also, it was found that TGF-ß1 gene rs1800470 29 T/C polymorphisms had a detrimental effect on mandibular development.
Author notes
Assistant Professor, Department of Orthodontics, Faculty of Dentistry, Marmara University, Istanbul, Turkey.
Associate Professor, Department of Orthodontics, Faculty of Dentistry, Marmara University, Istanbul, Turkey.
Assistant Professor, Department of Basic Medical Sciences, Division of Medical Biology and Genetics, Faculty of Dentistry, Marmara University, Istanbul, Turkey.
MSc Student, Department of Basic Medical Sciences, Institute of Health Sciences, Marmara University, Istanbul, Turkey.