Abstract
Sarcoidosis is known to be a systemic granulomatous disorder characterized by a cell-mediated Th1-type inflammatory response. To identify a key genetic factor in the pathogenesis of sarcoidosis, we investigated single nucleotide polymorphisms within 10 candidate genes involved in type 1 immune process (IFNA17, IFNB, IFNG, IFNGR1, IFNGR2, IL12B, IL12RB1, IL12RB2, ETA-1, and NRAMP1) in an association-based study of 102 Japanese patients with sarcoidosis, 114 with tuberculosis, and 110 control subjects. After correction for multiple testing, an IFNA17 polymorphism (551T→G) was found to be associated with susceptibility to sarcoidosis (odds ratio 3.27 [95% CI: 1.44–7.46], P=0.004, P c=0.04), but not to tuberculosis. We observed no significant associations with the other polymorphisms of the Th1-related genes. We further typed another IFNA polymorphism (IFNA10 60T→A) and confirmed two major haplotypes of the IFNA gene, viz., allele 1: IFNA10 [60T]-IFNA17 [551T] and allele 2: IFNA10 [60A]-IFNA17 [551G], in the Japanese population. In healthy subjects, IFNA allele 2, which is over-represented in patients with sarcoidosis, was significantly associated with increased IFN-α and IL-12p70 production induced by Sendai virus in vitro. This study suggests that possession of the IFNA allele with higher levels of IFN-α significantly increases the risk of sarcoidosis.
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Acknowledgements
We thank Ms. Yuko Furukawa for her skillful technical assistance. This work was supported by a Wellcome Trust International Collaborative Grant and by a Grant-in-Aid for Scientific Research from the Ministry of Health, Labour, and Welfare.
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M. Akahoshi and M. Ishihara contributed equally to this work
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Akahoshi, M., Ishihara, M., Remus, N. et al. Association between IFNA genotype and the risk of sarcoidosis. Hum Genet 114, 503–509 (2004). https://doi.org/10.1007/s00439-004-1099-5
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DOI: https://doi.org/10.1007/s00439-004-1099-5