The polymorphism of dopamine receptor (DRD) and oxytocin (OXT) may be associated with schizophrenia. A case-control study of 248 schizophrenia patients and 236 controls was conducted using the Sequenom MassARRAY platform. The results showed that DRD2 rs1800497 was a heterozygote (AG vs. GG: adjusted odds ratio [OR] = 1.88; 95% confidence interval [CI]: 1.09-3.25) and DRD3 rs7631540 (TC vs. CC: adjusted OR = 0.60; 95% CI: 0.36-1.02) may be associated with an increased risk of developing schizophrenia. In addition, the DRD2 rs1800497 genotype GA showed a reduced risk of schizophrenia in the male subgroup and the late-onset subgroup (>27 years of age). For DRD3 polymorphisms, the rs7631540 TC genotype was associated with schizophrenia in the female subgroup. In OXT polymorphism analysis, rs2740210 codominant CA/AA was a risk factor for schizophrenia in the male and early-onset subgroup (≤27 years old). This study also concluded that OXT rs2740210 codominant CA/AA is associated with schizophrenia.
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