HTR2A1438A/G polymorphism influences the risk of schizophrenia but not bipolar disorder or major depressive disorder: A meta-analysis

The incidence of psychiatric disorders has been shown to have a strong genetic component, and we conducted this study to investigate whether the 1438A/G polymorphism of the HTR2A gene was associated with susceptibility to schizophrenia (SZ), bipolar disorder (BD), and major depressive disorder (MDD). Pooled odd ratios (ORs) and 95% confidence intervals (95% CIs) were calculated using data obtained from a total 27 studies that investigated an association between the HTR2A 1438A/G polymorphism and SZ (15), BD (7), and MDD (4). We failed to observe an association between the HTR2A 1438A/G polymorphism and BD and MDD, and we found contrary results with regard to SZ. Our results showed that the 1438A/G polymorphism was a risk factor for SZ, especially in Caucasians (allele model: OR, 1.12; 95% CI, 1.051.20; I2 = 17.3%; dominant model: OR, 1.14; 95% CI, 1.031.27; I2 = 15.3%; recessive model: OR, 1.20; 95% CI, 1.061.37; I2 = 0.0%; codominant model 1: OR, 1.16; 95% CI, 1.011.32; I2 = 0.0%). We found that the association of the HTR2A 1438A/G polymorphism with SZ depends on the ethnic origin of the study population, and this genetic variant does not modify the susceptibility to BD or MDD. (c) 2013 Wiley Periodicals, Inc.