Inherited ARPC5 mutations cause an actinopathy impairing cell motility and disrupting cytokine signaling

Nat Commun. 2023 Jun 22;14(1):3708. doi: 10.1038/s41467-023-39272-0.

Abstract

We describe the first cases of germline biallelic null mutations in ARPC5, part of the Arp2/3 actin nucleator complex, in two unrelated patients presenting with recurrent and severe infections, early-onset autoimmunity, inflammation, and dysmorphisms. This defect compromises multiple cell lineages and functions, and when protein expression is reestablished in-vitro, the Arp2/3 complex conformation and functions are rescued. As part of the pathophysiological evaluation, we also show that interleukin (IL)-6 signaling is distinctively impacted in this syndrome. Disruption of IL-6 classical but not trans-signaling highlights their differential roles in the disease and offers perspectives for therapeutic molecular targets.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Actin-Related Protein 2-3 Complex* / genetics
  • Actin-Related Protein 2-3 Complex* / metabolism
  • Actins* / genetics
  • Actins* / metabolism
  • Cell Movement
  • Cytokines / genetics
  • Germ-Line Mutation
  • Humans

Substances

  • Actin-Related Protein 2-3 Complex
  • Actins
  • Cytokines
  • ARPC5 protein, human