Painful Temporomandibular Joint Clicking: A Genetic Point of View (original) (raw)
Journal of Oral & Facial Pain and Headache
Aims: To determine whether there is an association between gene polymorphisms and patients with painful temporomandibular joint (TMJ) clicking when compared to patients with painless TMJ clicking and a healthy control group. Methods: In this pilot study, the genotypic and allelic frequencies of candidate single-nucleotide polymorphisms (SNP) were compared among 60 individuals divided equally into three groups: patients with painful TMJ clicking (n = 20); patients with painless TMJ clicking (n = 20); and healthy controls (n = 20). Participants were genotyped for the following SNPs using real-time polymerase chain reaction: MMP1-16071G/2G, COMT Val158Met, TNFα-308, IL1β +3954, IL6-174, and IL10-1082. The pressure pain threshold (PPT) of the TMJ was also assessed. All variables were compared among groups. Results: Patients with painful TMJ clicking had a significant association and a higher frequency of MMP1-16071G/2G (P = .042), COMT Val158Met (P = .030), and TNFα-308 (P = .016) when compared to the other groups, as well as a lower frequency of IL10-1082. Considering PPT values, a progressively lower mean was found in individuals with painful TMJ clicking, followed sequentially by the painless TMJ clicking and the control groups. Conclusion: This pilot study showed that patients with painful TMJ clicking had a significant association with mutant genotypes related to degradation of extracellular matrix components, pain, proinflammation, and anti-inflammation. Furthermore, these patients also had significantly lower TMJ PPT values in all comparisons.
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