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Background  Although familial clustering of functional dyspepsia (FD) has been reported, the role of genetics in the susceptibility to FD is still not well understood. In the present study, the association between serotonin transporter (SERT) gene ( SLC6A4 ) polymorphism and FD was explored.    Methods  Subjects were divided into either a postprandial distress syndrome (PDS) group or an epigastric pain syndrome (EPS) group according to the Rome III criteria. The healthy controls were those who had visited a hospital for an annual health check-up. The presence of the  SLC6A4  promoter polymorphism,  5-hydroxytryptamin transporter gene linked polymorphic region  ( 5-HTTLPR ), was then evaluated, and logistic regression analysis was used to test all variables.    Results  The  5-HTTLPR  genotype distribution was 448 SS, 174 SL, and 24 LL in controls and 30 SS, 20 SL, and 3 LL in FD subjects. No significant correlation was found between the  5-HTTLPR  genotype and FD. When the genotypes and subtypes of FD were exploratory evaluated, the SL genotype was significantly associated with PDS [odds ratio (OR) = 2.24, 95% confidence interval (CI); 1.16-4.32,  P  = 0.034 after Bonferroni correction] compared to the SS genotype adjusted for sex and age. Comparison of the SS genotype with the SL/LL genotype also showed a significant association of genotype with PDS (OR = 2.32, 95% CI; 1.23-4.37,  P  = 0.009).    Conclusion  The present results suggest that  5-HTTLPR  L allele may influence the susceptibility to PDS.

Serotonin transporter gene polymorphism may be associated with functional dyspepsia in a Japanese population