title: No evidence for an association of the CTLA4 gene with bipolar I disorder.
abstract: The purpose of the present paper was to investigate the relationship between the first exon at position +49 (A/G) polymorphism of the cytotoxic T lymphocyte antigen 4 (CTLA4) gene and bipolar disorder. Among the Korean patients diagnosed with bipolar disorder according to Diagnostic and Statistical Manual of Mental Disorders (4th edn; DSM-IV), 90 patients without serious medical illness, neurologic illness, hormonal disorder, or concomitant mental illness were selected. The normal control group consisted of 149 age- and sex-matched subjects without current or past history of autoimmune diseases or mental disorder. DNA was extracted from peripheral blood using proteinase K; and the exon 1 region of the CTLA4 gene was amplified by polymerase chain reaction. Gene typing was performed using single strand conformation polymorphism. There were no significant differences in genotype frequencies of CTLA4*G/G, CTLA4*G/A, and CTLA4*A/A between the patients with bipolar disorder and the control group (48.9% vs 46.3%, 44.4% vs 39.6%, and 6.7% vs 14.1%, respectively). There were no significant differences in allelic frequencies of CTLA4*G and CTLA4*A between the patients with bipolar disorder and the control group (71.1% vs 66.1%; 28.9% vs 33.9%, respectively). In the present study an association was not found of exon 1 (+49) polymorphism of CTLA4 gene with bipolar disorder in the Korean population.
authors.affiliation: Department of Psychiatry, College of Medicine, Catholic University of Korea, Seoul, Korea.
authors.forename: Tae-Youn
authors.initials: TY
authors.lastname: Jun
authors.forename: Kyoung-Uk
authors.initials: KU
authors.lastname: Lee
authors.forename: Chi-Un
authors.initials: CU
authors.lastname: Pae
authors.forename: Yong-Sil
authors.initials: YS
authors.lastname: Kweon
authors.forename: Jeong-Ho
authors.initials: JH
authors.lastname: Chae
authors.forename: Won-Myong
authors.initials: WM
authors.lastname: Bahk
authors.forename: Kwang-Soo
authors.initials: KS
authors.lastname: Kim
authors.forename: Tae-Yul
authors.initials: TY
authors.lastname: Lew
authors.forename: Hoon
authors.initials: H
authors.lastname: Han
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000483:Alleles; D015703:Antigens, CD; D000943:Antigens, Differentiation / Q000235:genetics*; D001714:Bipolar Disorder / Q000235:genetics*; D060908:CTLA-4 Antigen; D016022:Case-Control Studies; D004247:DNA / Q000032:analysis; D039721:Diagnostic and Statistical Manual of Mental Disorders; D005260:Female; D005838:Genotype; D006801:Humans; D007723:Korea; D008297:Male; D008875:Middle Aged; D011110:Polymorphism, Genetic; D018807:Polymorphism, Single-Stranded Conformational
chemical_list: D015703:Antigens, CD; D000943:Antigens, Differentiation; D060908:CTLA-4 Antigen; C556706:CTLA4 protein, human; D004247:DNA