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Hypothalamic atrophy in CANVAS/RFC1.

Verena Miranda Souza1, Camila Caroso Lobo1, Thiago Junqueira Ribeiro Rezende1

  • 1Department of Neurology, School of Medical Sciences, University of Campinas (UNICAMP), Rua Tessália Vieira de Camargo, Universitária "Zeferino Vaz", 126. Cidade, Campinas, SP, Brazil.

Journal of Neurology
|June 17, 2025
PubMed
Summary
This summary is machine-generated.

Cerebellar ataxia, neuropathy, and vestibular areflexia syndrome (CANVAS) is linked to RFC1 gene mutations. This study found reduced hypothalamic volume in CANVAS patients, indicating hypothalamic atrophy plays a role in the condition.

Keywords:
AtaxiaDysautonomiaHypothalamusMRIRFC1 expansion

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Area of Science:

  • Neurology
  • Neuroimaging
  • Genetics

Background:

  • Cerebellar ataxia, neuropathy, and vestibular areflexia syndrome (CANVAS) is a late-onset multisystem disorder associated with the RFC1 gene.
  • While dysautonomia and sleep disturbances are known, hypothalamic involvement in CANVAS remains uncharacterized.

Purpose of the Study:

  • To investigate hypothalamic volumetry in patients with CANVAS/RFC1.
  • To determine if the RFC1 gene mutation impacts hypothalamic structure.

Main Methods:

  • Utilized 3 Tesla MRI scans for automated hypothalamic segmentation in 19 CANVAS/RFC1 patients and 19 healthy controls.
  • Employed ANCOVA for volumetric comparisons and Pearson's correlation to assess relationships with ataxia and autonomic symptom scores.

Main Results:

  • CANVAS/RFC1 patients exhibited significantly reduced total hypothalamic volume compared to controls (P=0.03).
  • A significant reduction in left tuberal superior (LTS) volume was observed in the CANVAS/RFC1 group (P=0.02).
  • LTS volume showed an inverse correlation with ataxia severity (SARA score, R=-0.51, P=0.049), but no association with autonomic dysfunction (SCOPA-AUT).

Conclusions:

  • The findings reveal significant hypothalamic atrophy in CANVAS patients.
  • This suggests the hypothalamus is involved in the pathophysiology of CANVAS.
  • Further research is warranted to explore broader hypothalamic dysfunctions and their clinical impact in CANVAS.