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Multi-system neurological disorder associated with a CRYAB variant.

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A CRYAB gene variant causes a rare multisystem disorder affecting the nervous system, eyes, heart, and muscles. This study identifies crystallized chaperones in patient muscle, expanding understanding of alpha B-crystallinopathies.

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Area of Science:

  • Genetics
  • Neurology
  • Molecular Biology

Background:

  • Alpha B-crystallin (CRYAB) is a small heat shock protein functioning as a molecular chaperone.
  • Mutations in CRYAB are associated with various inherited disorders, including cataracts and cardiomyopathies.
  • The full spectrum of neurological involvement in CRYAB-related disorders remains incompletely understood.

Observation:

  • A multiplex family presented with a novel multisystem neurological phenotype.
  • Affected individuals exhibited early-onset cataracts, cardiomyopathy, cerebellar ataxia, optic atrophy, cognitive impairment, and myopathy.
  • Genetic analysis revealed a heterozygous c.458C>T variant in the CRYAB gene.

Findings:

  • The identified CRYAB variant disrupts the molecular chaperone function and protein aggregation suppression.
  • Muscle biopsies showed subsarcolemmal deposits composed of crystallized chaperones/heat shock proteins.
  • Structural modeling suggested a role for Ser153 in protein stabilization and interactions.

Implications:

  • This report potentially broadens the phenotypic spectrum of alpha B-crystallinopathies.
  • The findings suggest a possible impact of CRYAB variants on the central nervous system.
  • Understanding the molecular mechanisms underlying CRYAB-related disorders is crucial for diagnosis and potential therapies.