title: Genetic polymorphism of glutathione S-transferase T1: a candidate genetic modifier of individual susceptibility to schizophrenia.
abstract: Schizophrenia is highly heritable, but the specific genes involved remain to be determined. A genome wide scan approach has indicated that human chromosome 22q11.2 potentially influences schizophrenia susceptibility. The gene encoding glutathione S-transferase T1 (GSTT1), which pertains to phase II biotransformation enzymes, was also mapped to the above-mentioned band. The present case-control study was performed on 292 (206 males, 86 females) in-patients with schizophrenia, and a total of 292 healthy blood donors matched to the patients according to age (+/-5 years) and gender as a control group. The patients were chronic cases. The patients were diagnosed as chronic schizophrenia according to structured clinical interview using the Structured Clinical Interview for DSM-IV (clinician version) to confirm and document DSM-IV diagnosis. The GSTT1 genotypes were determined using a PCR-based method. The GSTT1 null genotype was 17.8% and 33.9% in the patients and control groups, respectively. The GSTT1 null genotype was associated with a significantly reduced risk of developing schizophrenia. On the other word, the positive GSTT1 genotype significantly increased the risk of schizophrenia. The present finding indicated that GSTT1 is a candidate gene for susceptibility to schizophrenia.
authors.affiliation: Department of Biology, College of Sciences, Shiraz University, Shiraz 71454, Iran. saadat@susc.ac.ir
authors.forename: Mostafa
authors.initials: M
authors.lastname: Saadat
authors.forename: Fatemeh
authors.initials: F
authors.lastname: Mobayen
authors.forename: Hassan
authors.initials: H
authors.lastname: Farrashbandi
mesh_terms: D000328:Adult; D016022:Case-Control Studies; D005260:Female; D005819:Genetic Markers / Q000235:genetics; D020022:Genetic Predisposition to Disease / Q000235:genetics*; D005838:Genotype; D005982:Glutathione Transferase / Q000235:genetics*; D006801:Humans; D007492:Iran; D008297:Male; D008875:Middle Aged; D016133:Polymerase Chain Reaction; D011110:Polymorphism, Genetic / Q000235:genetics*; D012016:Reference Values; D012559:Schizophrenia / Q000175:diagnosis / Q000235:genetics*
chemical_list: D005819:Genetic Markers; C413545:glutathione S-transferase T1; D005982:Glutathione Transferase