Association between schizophrenia and T102C polymorphism of the 5-hydroxytryptamine type 2a-receptor gene
Summary Background An association between schizophrenia and the T102C polymorphism of the gene for 5-hydroxytryptamine type 2a (5-HT 2a) receptor has been reported; the proportion of allele 2 of this polymorphism is higher than expected among schizophrenic patients. We looked for an association betw...
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Veröffentlicht in: | The Lancet (British edition) 1996-05, Vol.347 (9011), p.1294-1296 |
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Zusammenfassung: | Summary
Background An association between schizophrenia and the T102C polymorphism of the gene for 5-hydroxytryptamine type 2a (5-HT
2a) receptor has been reported; the proportion of allele 2 of this polymorphism is higher than expected among schizophrenic patients. We looked for an association between schizophrenia and this variant of the 5-HT
2a-receptor gene in a large multicentre study.
Methods Seven countries recruited 1210 participants: 571 white schizophrenic patients and 639 ethnically matched controls. All patients had a diagnosis of schizophrenia or schizoaffective disorder. High-molecular-weight DNA was isolated from lymphocytes. PCR amplification and restriction enzyme digestion was used to examine sequence variation of the 5-HT
2a-receptor gene. Genotypes
1/1, 1/2,and
2/2 were assigned. Woolf's method was used to look for an association between schizophrenia and allele 2 and the
2/2genotype.
Findings We found a significant overall association between schizophrenia and allele 2 with an odds ratio of 1·3 (95% Cl 1·1-1·53, p=0·003). No evidence for heterogeneity was observed between samples. We found a highly significant excess of the
1-2/2-2genotypes in schizophrenia (p=0·008) with a relative risk of 1·7 (1·22-2·36) and an attributable fraction of 0·35.
Interpretation Our findings suggest that the gene for 5-HT
2a-receptor, or a locus in linkage disequilibrium with it, confers susceptibility to schizophrenia. Allele 2 is common in the population and it is, therefore, likely that this variant, or a nearby polymorphism, may affect a significant proportion of schizophrenic patients. |
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ISSN: | 0140-6736 1474-547X |
DOI: | 10.1016/S0140-6736(96)90939-3 |