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Galarza-Muñoz, Gaddiel; Briggs, Farren B.S.; Evsyukova, Irina; Schott-Lerner, Geraldine; Kennedy, Edward M.; Nyanhete, Tinashe; Wang, Liuyang; Bergamaschi, Laura; Widen, Steven G.; Tomaras, Georgia D.; Ko, Dennis C.; Bradrick, Shelton S.; Barcellos, Lisa F.; Gregory, Simon G.; Garcia-Blanco, Mariano A.
Cell, 03/2017, Letnik: 169, Številka: 1Journal Article
Multiple sclerosis (MS) is an autoimmune disorder where T cells attack neurons in the central nervous system (CNS) leading to demyelination and neurological deficits. A driver of increased MS risk is the soluble form of the interleukin-7 receptor alpha chain gene (sIL7R) produced by alternative splicing of IL7R exon 6. Here, we identified the RNA helicase DDX39B as a potent activator of this exon and consequently a repressor of sIL7R, and we found strong genetic association of DDX39B with MS risk. Indeed, we showed that a genetic variant in the 5′ UTR of DDX39B reduces translation of DDX39B mRNAs and increases MS risk. Importantly, this DDX39B variant showed strong genetic and functional epistasis with allelic variants in IL7R exon 6. This study establishes the occurrence of biological epistasis in humans and provides mechanistic insight into the regulation of IL7R exon 6 splicing and its impact on MS risk. Display omitted •DDX39B is a potent activator of IL7R exon 6 splicing and a repressor of sIL7R•DDX39B genetic variants are significantly associated with MS risk•The 5′ UTR DDX39B variant reduces protein levels by decreasing translation efficiency•This variant shows strong genetic and functional epistasis with IL7R rs6897932 Two genes interact epistatically in multiple sclerosis risk in humans.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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