1. Identification of IFRD1 as a modifier gene for cystic fibrosis lung disease
- Author
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Gu, YuanYuan, Harleys, Isaac T.W., Henderson, Lindsay B., Aronow, Bruce J., Vietor, Ilja, Huber, Lukas A., Harley, John B., Kilpatrick, Jeffrey R., Langefeld, Carl D., Williams, Adrienne H., Jegga, Anil G., Chen, Jing, Wills-Karp, Marsha, Arshads, S. Hasan, Ewart, Susan L., Thio, Chloe L., Flick, Leah M., Filippi, Marie-Dominique, Grimes, H. Leighton, Drumm, Mitchell L., Cutting, Garry R., Knowles, Michael R., and Karp, Christopher L.
- Subjects
Cystic fibrosis -- Genetic aspects -- Research ,Single nucleotide polymorphisms -- Health aspects -- Research -- Physiological aspects -- Genetic aspects ,Membrane proteins -- Physiological aspects -- Genetic aspects -- Research -- Health aspects ,Environmental issues ,Science and technology ,Zoology and wildlife conservation ,Physiological aspects ,Research ,Genetic aspects ,Health aspects - Abstract
Lung disease is the major cause of morbidity and mortality in cystic fibrosis, an autosomal recessive disease caused by mutations in CFTR. In cystic fibrosis, chronic infection and dysregulated neutrophilic inflammation lead to progressive airway destruction. The severity of cystic fibrosis lung disease has considerable heritability, independent of CFTR genotype (1). To identify genetic modifiers, here we performed a genome-wide single nucleotide polymorphism scan in one cohort of cystic fibrosis patients, replicating top candidates in an independent cohort. This approach identified IFRD1 as a modifier of cystic fibrosis lung disease severity. IFRD1 is a histone-deacetylase-dependent transcriptional co-regulator expressed during terminal neutrophil differentiation. Neutrophil, but not macrophages, from Ifrd1-deficient mice showed blunted effector function, associated with decreased NF-κB p65 transactivation. In vivo, IFRD1 deficiency caused delayed bacterial clearance from the airway, but also less inflammation and disease--a phenotype primarily dependent on haematopoietic cell expression, or lack of expression, of IFRD1. In humans, IFRD1 polymorphisms were significantly associated with variation in neutrophil effector function. These data indicate that IFRD1 modulates the pathogenesis of cystic fibrosis lung disease through the regulation of neutrophil effector function., Attention to the role of CFTR in regulating epithelial ion transport has failed to illuminate the path from gene to pathogenesis in cystic fibrosis (CF) lung disease. In CF, colonization [...]
- Published
- 2009