Aim. Major depression is a common and complex disorder ofpolygenic origin. Given its importance in the pathophysiology andtherapy of disease, it’s demonstrated that gene encoding serotonintransporter (5-HTT) is associated with the disease. We conducted astudy to assess the association between polymorphisms of 5-HTT geneand major depressive disorder. Methods. Case-control study, with patients classified from DSMIV-TR structured interview and matched 1: 1. Results were analyzedusing central tendency and dispersion measures, chi-square, OddsRatios and conditional logistic regression. We evaluated the presence ofHardy-Weinberg equilibrium with Pearson chi-square. Results. 69 cases and 69 controls were evaluated. Sociodemographicand clinical variables were similar to those reportedpreviously in the literature. The sample was in Hardy-Weinbergequilibrium. No statistically significant association was found betweenmajor depressive disorder and 5-HTT gene polymorphisms. Discussion. Results are similar to those previously reported by otherstudies in bipolar patients Colombians, suggesting that in thispopulation there is no association between affective disorders and 5-HTT gene polymorphisms. More studies are needed.
