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Published on: June 15, 2011
C957T DRD2 polymorphism is associated with schizophrenia in Spanish patients
J Hoenicka1, M Aragüés, R Rodríguez-Jiménez
1Psychiatry Service, Dual Diagnosis Unit, '12 de Octubre' University Hospital, Madrid, Spain. jhoenicka.hdoc@salud.madrid.org
Objective:
The objective was to confirm whether a homozygous genotype for the C957 allele of the C957T DRD2 gene single nucleotide polymorphism (SNP) is associated with schizophrenia in an independent study population.
Method:
We examined the genotypic distribution of this SNP in a set of clinically ascertained schizophrenic patients (n = 131) and age-matched control subjects (n = 364). Individuals were genotyped using automated analysis of fluorescently labeled PCR products.
Results:
The distribution of grouped genotypes for the C957T DRD2 SNP (CC vs. CT, TT) showed that C homozygote genotype was over-represented in our patient sample when compared with control subjects. This difference reaches the statistical significance (chi(2) = 7.0; df = 1; P = 0.008; OR = 2.05; % CI 1.2-3.4).
Conclusion:
The findings of this study provide additional evidence that genetic variation at the DRD2 gene plays an important role in the vulnerability to schizophrenia.
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