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Study on the interrelationship between 5-HTTLPR/G-protein &bgr;3 subunit (C825T) polymorphisms and depressive disorder

Objective To assess whether the promoter region of the serotonin transporter gene (5-HTTLPR) and G-protein &bgr;3-subunit (GN&bgr;3 C825T) polymorphisms are associated with depressive disorder and explore the genetic mechanism concerning the pathogenesis of this disorder. Methods The genotypes were determined with polymerase chain reaction and allele-specific restriction enzyme analysis. Patients suffering from depression (n=184) and sex and age-matched controls (n=158) were compared in this study. Results The frequencies of 5-HTTLPR SS and GN&bgr;3 825TT genotypes and 5-HTTLPR S and GN&bgr;3 825T alleles in patients suffering from depression were significantly higher than those in the controls (P<0.01). Combined genotype analysis showed that individuals with both 5-HTTLPR S and GN&bgr;3 825T alleles (odds ratio=3.25, P=0.002) had a risk of depressive disorder higher than those with 5-HTTLPR S (odds ratio=1.817, P=0.01) or GN&bgr;3 825T alleles (odds ratio=2.214, P=0.001) alone. Conclusions These results indicated that the etiology of depressive disorder is associated with 5-HTTLPR and GN&bgr;3 C825T polymorphisms. Our data also suggests that an interaction effect may exist between the 5-HTTLPR S allele and GN&bgr;3 825T allele in increasing the risk of depressive disorder.