title: Association of Fcgamma receptor IIb and IIIb polymorphisms with susceptibility to systemic lupus erythematosus in Thais.
abstract: We recently reported association of a newly identified polymorphism of Fcgamma receptor (FcgammaR) IIb, I232T, with systemic lupus erythematosus (SLE) in Japanese. To date, information on FcgammaR genotypes and their association with SLE is limited in South-east Asian populations. To gain further insight into the role of FcgammaR polymorphisms in the genetic predisposition of SLE, association of FcgammaRIIa-H131R, IIb-I232T, IIIa-F176V and IIIb-NA1/NA2 (HNA-1a/1b) polymorphisms with SLE was analyzed in the Thai population, using case-control association analysis. FcgammaRIIb-232T/T and IIIb-NA2/NA2 genotypes were associated with SLE with the odds ratio of 2.55. Genotype relative risk analysis revealed significant association of IIb-232T/T and IIIb-NA2/NA2, and a tendency of association of the IIIa-176F/F genotype. Moreover, carriers of FcgammaRIIa-131R were significantly increased in patients with lupus nephritis. Significant linkage disequilibrium was present among FcgammaRIIb, IIIa and IIIb, and two-locus analyses suggested that the tendency of association of FcgammaRIIIa could derive from linkage disequilibrium with IIb and IIIb. These results provided evidence that FcgammaR polymorphisms may be an important predisposing factor also in Thais in a complex manner.
authors.affiliation: Department of Transfusion Medicine, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand.
authors.forename: U
authors.initials: U
authors.lastname: Siriboonrit
authors.forename: N
authors.initials: N
authors.lastname: Tsuchiya
authors.forename: M
authors.initials: M
authors.lastname: Sirikong
authors.forename: C
authors.initials: C
authors.lastname: Kyogoku
authors.forename: S
authors.initials: S
authors.lastname: Bejrachandra
authors.forename: P
authors.initials: P
authors.lastname: Suthipinittharm
authors.forename: K
authors.initials: K
authors.lastname: Luangtrakool
authors.forename: D
authors.initials: D
authors.lastname: Srinak
authors.forename: R
authors.initials: R
authors.lastname: Thongpradit
authors.forename: K
authors.initials: K
authors.lastname: Fujiwara
authors.forename: D
authors.initials: D
authors.lastname: Chandanayingyong
authors.forename: K
authors.initials: K
authors.lastname: Tokunaga
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D015703:Antigens, CD / Q000235:genetics*; D016022:Case-Control Studies; D005260:Female; D058851:GPI-Linked Proteins; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006801:Humans; D007564:Japan; D015810:Linkage Disequilibrium; D008180:Lupus Erythematosus, Systemic / Q000453:epidemiology / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D020641:Polymorphism, Single Nucleotide; D017452:Receptors, IgG / Q000235:genetics*; D013785:Thailand / Q000453:epidemiology
chemical_list: D015703:Antigens, CD; C428200:FCGR3B protein, human; C080571:Fc gamma receptor IIB; D058851:GPI-Linked Proteins; D017452:Receptors, IgG