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Golimbet, V E; Mitiushina, N G; Shcherbatykh, T V; Aksenova, M G; Abramova, L I; Kaleda, V G; Nosikov, V V; Iurov, Iu B; Rogaev, E I
Zhurnal nevrologii i psikhiatrii imeni S.S. Korsakova, 2001, Letnik: 101, Številka: 4Journal Article
Molecular-genetic polymorphism of genes-candidates was investigated: the genes of serotonin receptor--type 2a (HTR2A), dopamine receptor gene--type 2, serotonin transporter (5HTTLPR). Thirty one schizophrenic patients whose age was 12.6 +/- 3.6 years at the onset of the disease and 208 patients whose age was 23.5 +/- 6.7 years at the onset of the disease were examined. The frequencies of HTTLPR and DRD2 genotypes differed insignificantly in both groups. The distribution of 5HTR2A genotypes in the schizophrenic group with an early manifestation of the disease differed from that with a later manifestation significantly (chi 2 = 6.27; df = 2; p = 0.044). The relative risk (odds ratios) was 7.9 with 95% significance interval 1.008-61.94; p = 0.045. The severity of the disease and a positive family history were also examined in A2A2 genotype carriers. A positive family history was found in 9 (52.9%) of the 17 schizophrenics with an early manifestation and only in 15 (21.1%) of 71 patients of the similar group with a later one. Assessment of the clinical symptoms revealed that the total scores by the negative symptomatology subscale (PANSS) was higher in the patients with an early manifestation than in those with later one; but these differences did not achieve the significance level. These and earlier findings lead to the conclusion that A2A2 genotype was more frequently observed in the patients with more pronounced negative symptoms and high hereditary burden, which suggests that the A2A2 genotype is associated with an early onset.
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