OBJECTIVES: The 102T/C single nucleotide polymorphism (SNP) in the 5-hydroxytryptamine receptor 2A (HTR2A) gene has been reported to be associated with schizophrenia. However, SNPs of the HTR2A gene other than the 102T/C have attracted only limited studies in relation to schizophrenia, and also on the whole SNPs of the HTR2A gene have been little studied in relation to clinical parameters in patients. Therefore, the aim of this study was to evaluate the impact of main functionally characterized SNPs of the HTR2A gene on both the schizophrenia and clinical parameters.
METHODS: Ninety-four patients with schizophrenia and 57 control subjects were genotyped for the -1438A/G, -783A/G, 102T/C and His452Tyr SNPs of the HTR2A gene. The four SNPs were then investigated in relation to the schizophrenia and clinical parameters.
RESULTS: No differences were found in genotype-, allele- or haplotype frequencies between schizophrenia patients and control subjects. However, the 452Tyr variant of the His452Tyr polymorphism occurred more often in patients with a family history of schizophrenia compared with patients without heredity (p=0.028). The 452Tyr variant was also more common in female patients with paranoid schizophrenia than in those with non-paranoid schizophrenia (p=0.018). Moreover, the male patients carrying the A/A or T/T genotypes of the -1438A/G and 102T/C polymorphisms were shorter than those carrying the G/A or C/T genotypes (p=0.007; p=0.006).
CONCLUSION: The present findings bring further support to the view that the -1438A/G, 102T/C and His452Tyr polymorphisms of the HTR2A gene are connected with a constitutive cellular change that causes susceptibility to schizophrenia.