title: Association study between monoamine oxidase A (MAOA) gene polymorphisms and schizophrenia: lack of association with schizophrenia and possible association with affective disturbances of schizophrenia.
abstract: Monoamine oxidase A (MAOA) catalyzes monoamine neurotransmitters including dopamine, 5-hydroxytryptamine (5-HT, serotonin), and norepinephrine. MAOA also plays a key role in emotional regulation. The aim of this study was to investigate the associations between the exonic single nucleotide polymorphisms (SNPs) of the MAOA gene located on the X chromosome and schizophrenia. We also analyzed the relationships between these SNPs and the common clinical symptoms of schizophrenia such as persecutory delusion, auditory hallucinations, affective disturbances, and poor concentration. Two hundred seventy five Korean schizophrenia patients and 289 control subjects were recruited. Three SNPs [rs6323 (Arg294Arg), rs1137070 (Asp470Asp), and rs3027407 (3'-untranslated region)] of the MAOA gene were selected and genotyped by direct sequencing. The common clinical symptoms of schizophrenia according to the Operation Criteria Checklist were analyzed. Three examined SNPs showed no associations with male and female schizophrenia, respectively (p>0.05). In the analysis of the common clinical symptoms of schizophrenia patients, three examined SNPs were associated with affective disturbances, especially restricted affect and blunted affect in male schizophrenia, respectively (restricted affect, p=0.002, OR=2.71, 95% CI 1.45-5.00; blunted affect, p=0.009, OR 2.25, 95% CI 1.22-4.12). The SNPs were not associated with other clinical symptoms of schizophrenia (persecutory delusion, auditory hallucinations, and poor concentration). These results suggest that exonic SNPs (rs6323, rs1137070, and rs3027407) of the MAOA gene may be contributed to affective disturbances of Korean males schizophrenia, especially restricted affect and blunted affect.
authors: Kohwang Medical Research Institute and Department of Pharmacology, School of Medicine, Kyung Hee University, Seoul, Korea.
authors: Su Kang
authors: SK
authors: Kim
authors: Hae Jeong
authors: HJ
authors: Park
authors: Hosik
authors: H
authors: Seok
authors: Hye Sook
authors: HS
authors: Jeon
authors: Joo-Ho
authors: JH
authors: Chung
authors: Won Sub
authors: WS
authors: Kang
authors: Jong Woo
authors: JW
authors: Kim
authors: Gyeong Im
authors: GI
authors: Yu
authors: Dong Hoon
authors: DH
authors: Shin
mesh_terms: D000328:Adult; D000483:Alleles; D016022:Case-Control Studies; D005260:Female; D005787:Gene Frequency; D056726:Genetic Association Studies; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006239:Haplotypes; D006801:Humans; D008297:Male; D008875:Middle Aged; D008995:Monoamine Oxidase / Q000235:genetics*; D011110:Polymorphism, Genetic; D020641:Polymorphism, Single Nucleotide; D056910:Republic of Korea; D012559:Schizophrenia / Q000175:diagnosis / Q000235:genetics*
chemical_list: D008995:Monoamine Oxidase