Summary: Researchers have identified a previously unknown genetic disorder that combines features of premature aging (a progeroid syndrome) with severe neurological impairment and intellectual decline. Using a combination of genome sequencing and advanced cellular reprogramming, the team traced the cause to a mutation in the IVNS1ABP gene and defined how that mutation disrupts fundamental cell processes.
Unlike classical progeria, where cognitive abilities are often preserved, this newly described condition produces progressive loss of motor skills and declining brain function. The study shows the IVNS1ABP mutation perturbs actin dynamics—the cellular scaffolding responsible for accurate cell division—resulting in asymmetric cytokinesis, DNA damage and entry into a persistent, senescent state.
Key Facts
- IVNS1ABP mutation: This is the first connection of IVNS1ABP to aging or neuropathy. The gene encodes a protein previously known for binding influenza virus components but now shown to be essential for normal human cell structure and division.
- Cellular senescence: Patient-derived cells become slow-growing and enter senescence, a non-dividing but metabolically active state commonly triggered by substantial DNA damage.
- Disrupted actin scaffolding: During cytokinesis, actin normally forms a symmetric contractile ring. In cells carrying the IVNS1ABP mutation, that ring is shrunken and irregular, leading to lopsided division, chromosome stress and genetic injury.
- Therapeutic potential: In laboratory models, chemical stabilization of actin partially corrected division defects and improved cell proliferation, pointing to a potential molecular target for future drug development.
Source: Sanford Burnham Prebys
Sanford Burnham Prebys Medical Discovery Institute scientists and an international team of collaborators have defined a new genetic disease that combines premature aging with severe neurological and intellectual deficits.
The investigators published their findings on March 19, 2026 in Nature Communications. This study is the first to combine whole-genome sequencing with patient-derived cellular reprogramming to identify the causal mutation and to dissect the cellular mechanisms that produce the clinical picture seen in affected families.
“We were alerted to a family whose teenage members displayed premature hair whitening and other age-related features,” said Su-Chun Zhang, MD, PhD, director of the Center for Neurologic Diseases at Sanford Burnham Prebys and the study’s senior author. “However, the progressive motor decline and cognitive impairment set these patients apart from typical progeroid syndromes, indicating a distinct, previously unknown disease.”
To locate the genetic cause, the team combined exome sequencing with mapping of recessive traits and identified a homozygous mutation in the IVNS1ABP gene. IVNS1ABP encodes a protein originally characterized for interacting with influenza non-structural protein 1, but its role in human cell biology had been little studied.
The researchers obtained skin cells from affected individuals and reprogrammed them into induced pluripotent stem cells (iPSCs), then differentiated these into neural progenitor cells (NPCs). These patient-derived cells retain the IVNS1ABP mutation, allowing direct study of its cellular consequences.
Compared with control cells derived from an unaffected sibling, the mutant cells proliferated slowly and showed hallmarks of cellular senescence. Molecular assays revealed multiple markers of DNA damage and elevated expression of the cell-cycle inhibitor CDKN2A, consistent with a senescent phenotype.
Follow-up experiments showed that DNA damage accumulated during cell division. The mutated IVNS1ABP protein did not have a previously known role in cytokinesis, so the team looked for interacting partners. Proteomic and biochemical analyses identified several candidate interactors, many of which are associated with actin, the structural filament that organizes the contractile ring during cell cleavage.
Normally, actin fibers form a symmetric contractile ring that evenly splits a mother cell into two daughters. In mutant cells, the actin ring is malformed—smaller, irregular and asymmetric—causing uneven division and physically trapping or breaking DNA, which leads to genetic injury and triggers senescence.
Importantly, the researchers were able to modify actin dynamics pharmacologically in cell culture. Compounds that stabilized actin structures partially rescued cytokinesis defects and improved cell viability and proliferation, demonstrating a concrete molecular target for future preclinical studies.
“This work highlights the power of patient-derived iPSC models to define mechanisms of rare diseases,” said Fang Yuan, PhD, first author. “By correcting specific molecular steps in the cellular model, we restored aspects of normal behavior, which points to possible therapeutic strategies.”
The team plans to develop animal models to validate these cellular findings and to test whether actin-stabilizing approaches can produce benefits in vivo. Meanwhile, the discovery establishes IVNS1ABP as a new gene linked to progeroid neuropathy and cellular senescence.
Funding: This study received support from the National Medical Research Council of Singapore, the National Research Foundation of Singapore, the Singapore Ministry of Education Research Fund, the Singapore Ministry of Health Research Fund, the Agency for Science, Technology and Research, Duke-NUS Medical School, the European Molecular Biology Organization, the Branco Weiss Foundation and the Strategic Positioning Fund for Genetic Orphan Diseases.
Key Questions Answered:
A: Patients display physical signs of premature aging, such as hair whitening and aged skin, but unlike most progeria syndromes where the brain is relatively spared, this condition causes substantial intellectual and motor decline because the nervous system is directly affected.
A: Actin is a structural filament that helps shape cells and forms the contractile ring required for successful cell division. If that ring is misshapen, as observed in these mutant cells, DNA can be damaged during division, promoting premature cellular aging and dysfunction.
A: In cell culture, stabilizing actin improved division and cell health, so actin dynamics represent a promising target. Translating this into a safe and effective human therapy will require extensive preclinical and clinical testing.
Editorial Notes:
- This article was edited by a Neuroscience News editor.
- The full journal paper was reviewed.
- Additional context was added by editorial staff.
About this neurology and aging research news
Author: Greg Calhoun
Source: Sanford Burnham Prebys
Contact: Greg Calhoun – Sanford Burnham Prebys
Image: The image is credited to Neuroscience News
Original Research: Open access. “IVNS1ABP mutation drives cellular senescence in newly identified progeroid neuropathy” by Fang Yuan, Ye Sing Tan, Haofei Wang, Ain Nur Ali, Qiang Yuan, Shu-Min Chou, Yu-Hsin Yen, Gunaseelan Narayanan, Lei Zhou, Mohammad Shboul, Carine Bonnard, Bruno Reversade & Su-Chun Zhang. Nature Neuroscience
DOI: 10.1038/s41467-026-70756-x
Abstract
IVNS1ABP mutation drives cellular senescence in newly identified progeroid neuropathy
We identified a new progeroid syndrome characterized by severe neuropathy and intellectual deficits. Exome sequencing revealed a homozygous mutation in IVNS1ABP, which encodes an IVNS1ABP protein previously recognized for binding influenza virus non-structural protein 1.
To study disease mechanisms, we generated isogenic induced pluripotent stem cells from patient fibroblasts and differentiated them into neural progenitor cells. Mutant IVNS1ABP fibroblasts, iPSCs and NPCs exhibited defective cytokinesis, increased DNA damage and premature cellular senescence.
Cerebral organoids displayed early differentiation of NPCs into neurons, and molecular profiling revealed altered interactions of mutant IVNS1ABP with actin and actin-associated proteins, together with disrupted actin dynamics during cytokinesis.
We propose that mutant IVNS1ABP dysregulates actin polymerization and organization, which contributes to the observed cellular senescence phenotypes in this progeroid neuropathy.