IVNS1ABP Deficiency Disrupts Actin Filament Organization and Leads to Cellular Senescence in a Newly Identified Progeroid Neuropathy Syndrome
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A homozygous variant in IVNS1ABP was identified in three siblings, displaying progeroid features with severe neuropathy. By generating isogenic induced pluripotent stem cells (iPSCs) from the patients’ fibroblasts and differentiating the iPSCs into neural progenitor cells (NPCs), we found that mutant IVNS1ABP fibroblasts, iPSCs, and NPCs exhibited disrupted cytokinesis, DNA damage and cellular senescence. Correspondingly, cerebral organoids displayed premature differentiation of NPCs to neurons. Molecular profiling as well as biochemical and cellular analysis revealed altered binding of mutant IVNS1ABP to actin /actin-associated proteins and dysregulated actin dynamics during cytokinesis. Taken together, we propose that mutant IVNS1ABP dysregulates actin polymerization and organization which is at least partly responsible for the cellular senescence phenotypes in this progeroid neuropathy syndrome.
