# Temporomandibular joint disorders, happiness, and COMT, HTR2A and FKBP5 polymorphisms in adolescents: a cross-sectional study

## TL;DR

This study found that happiness and a specific COMT gene variant are linked to temporomandibular joint disorders in Brazilian adolescents.

## Contribution

The study identifies a novel association between the COMT rs174675 polymorphism and TMD in adolescents.

## Key findings

- Adolescents who reported lower happiness were more likely to have TMD.
- The COMT gene rs174675 polymorphism was significantly associated with TMD.
- No significant associations were found between TMD and HTR2A or FKBP5 gene polymorphisms.

## Abstract

Temporomandibular joint disorder (TMD) has a multifactorial etiology involving psychological and genetic aspects. This condition commonly begins in adolescence, which is a period of emotional, physical, and psychological maturation. The aim of the present study was to investigate associations between temporomandibular joint (TMJ) disorder and happiness as well as polymorphisms in the COMT, HTR2A, and FKBP5 genes in Brazilian adolescents. A cross-sectional study was conducted with 90 adolescents aged 13 to 18 years. TMD was diagnosed using the RDC/TMD. The Subjective Happiness Scale (SHS) was used to assess happiness. Saliva samples were collected for the analysis of genomic DNA and genotyping of single nucleotide polymorphisms in the COMT (rs165656, rs174675), HTR2A (rs6313, rs4941573), and FKBP5 (rs1360780, rs3800373) genes using real-time PCR (Taqman method). Bivariate, unadjusted, and adjusted binary logistic regression analyses were performed (p < 0.05). Happiness was associated with TMD in the adolescents (OR=1.37; 95%CI: 1.02–1.85; p = 0.037). The rs174675 polymorphism in the COMT gene was significantly associated with TMD (OR = 0.18; 95%CI: 0.04–0.74; p = 0.018). No associations were found between TMD and polymorphisms in HTR2A and FKBP5 genes (p > 0.05). TMD was associated with happiness, as adolescents who considered themselves less happy were more likely to have this disorder. The diagnosis of TMD was also associated with the rs174675 polymorphism in the COMT gene, as the prevalence of the disorder was higher among homozygous C Brazilian adolescents than in heterozygous CT individuals.