title: Association of interferon gamma and interleukin 10 genes with tuberculosis in Hong Kong Chinese.
abstract: Interferon gamma (IFN-gamma) and interleukin 10 (IL-10) are believed to play opposing roles in host immunity against mycobacterial infection. IFN-gamma activates macrophages, while IL-10 downregulates the expression of T helper type 1 cytokines, MHC class II antigens and costimulatory molecules on macrophages. Associations of IFN-gamma -179 (G/T), +874 (A/T), +875 miscrosatellite CA repeats and +4766 (C/T), and IL-10 -1082 (A/G), -819 (C/T) and -592 (C/A) with tuberculosis (TB) were investigated in 385 HIV-negative patients and 451 controls in a Hong Kong Chinese population. The frequency of a low IFN-gamma-producing +874 A/A genotype was significantly over-represented in the patient group (P<0.001, OR=3.79, 95% CI=1.93-7.45). We identified 10 alleles in the IFN-gamma CA repeats and observed a significant difference in allele frequency distribution between patients and controls (P<0.001). By grouping alleles into 12 and non-12 CA repeats, the non-12/non-12 genotype yielded a similar significant result (P<0.001, OR=4.56, 95% CI=2.21-9.43) as observed in +874 A/A genotype. Weak associations of the IL-10 GCC/- genotype (P=0.04) and the low IFN-gamma-producing A/A genotype (P=0.06) with TB relapse/extrapulmonary cases were found. This study suggests the possible role of interferon gamma in TB susceptibility.
authors.affiliation: Department of Paediatrics and Adolescent Medicine, Jockey Club Clinical Research Centre, The University of Hong Kong, Queen Mary Hospital, Hong Kong SAR.
authors.forename: H W
authors.initials: HW
authors.lastname: Tso
authors.forename: W K
authors.initials: WK
authors.lastname: Ip
authors.forename: W P
authors.initials: WP
authors.lastname: Chong
authors.forename: C M
authors.initials: CM
authors.lastname: Tam
authors.forename: A K S
authors.initials: AK
authors.lastname: Chiang
authors.forename: Y L
authors.initials: YL
authors.lastname: Lau
mesh_terms: D000328:Adult; D000368:Aged; D044466:Asian People; D005260:Female; D020022:Genetic Predisposition to Disease; D006723:Hong Kong; D006801:Humans; D007371:Interferon-gamma / Q000235:genetics*; D016753:Interleukin-10 / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D020641:Polymorphism, Single Nucleotide / Q000235:genetics*; D014397:Tuberculosis, Pulmonary / Q000235:genetics*
chemical_list: D016753:Interleukin-10; D007371:Interferon-gamma