Abstract:
:Upon detection of pathogen-associated molecular patterns, innate immune receptors initiate inflammatory responses. These receptors include cytoplasmic NOD-like receptors (NLRs) whose stimulation recruits and proteolytically activates caspase-1 within the inflammasome, a multiprotein complex. Caspase-1 mediates the production of interleukin-1 family cytokines (IL1FCs), leading to fever and inflammatory cell death (pyroptosis). Mutations that constitutively activate these pathways underlie several autoinflammatory diseases with diverse clinical features. We describe a family with a previously unreported syndrome featuring neonatal-onset enterocolitis, periodic fever, and fatal or near-fatal episodes of autoinflammation. We show that the disease is caused by a de novo gain-of-function mutation in NLRC4 encoding a p.Val341Ala substitution in the HD1 domain of the protein that cosegregates with disease. Mutant NLRC4 causes constitutive IL1FC production and macrophage cell death. Infected macrophages from affected individuals are polarized toward pyroptosis and exhibit abnormal staining for inflammasome components. These findings identify and describe the cause of a life-threatening but treatable autoinflammatory disease that underscores the divergent roles of the NLRC4 inflammasome.
journal_name
Nat Genetjournal_title
Nature geneticsauthors
Romberg N,Al Moussawi K,Nelson-Williams C,Stiegler AL,Loring E,Choi M,Overton J,Meffre E,Khokha MK,Huttner AJ,West B,Podoltsev NA,Boggon TJ,Kazmierczak BI,Lifton RPdoi
10.1038/ng.3066subject
Has Abstractpub_date
2014-10-01 00:00:00pages
1135-1139issue
10eissn
1061-4036issn
1546-1718journal_volume
46pub_type
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