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Related Experiment Video

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A Simple Composite Phenotype Scoring System for Evaluating Mouse Models of Cerebellar Ataxia

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Published on: May 21, 2010

Late onset hereditary episodic ataxia.

M Damak¹, F Riant, M Boukobza

¹Assistance Publique-Hôpitaux de Paris, Hôpital Lariboisière, Service de Neurologie, Paris, France.

Journal of Neurology, Neurosurgery, and Psychiatry

|April 18, 2009

Summary

This study describes a new form of late-onset episodic ataxia (EA) in a French family. Genetic analysis excluded known EA genes, suggesting a novel genetic cause for this progressive neurological disorder.

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Area of Science:

Neurogenetics
Neurology
Molecular Biology

Background:

Episodic ataxias (EA) are rare hereditary neurological disorders characterized by recurrent episodes of ataxia.
Significant clinical and genetic heterogeneity exists among EA types, with seven loci and four genes identified to date.
Further investigation of familial and sporadic cases is crucial for a comprehensive understanding of EA's spectrum.

Observation:

A two-generation French family presented with late-onset episodic ataxia, with symptom onset between 48 and 56 years.
Affected individuals exhibited variable symptom severity, including daily attacks, progressive cerebellar ataxia, and poor response to acetazolamide.
Brain MRI revealed cerebellar atrophy in affected members, indicated by a reduced cerebellar volume to total intracranial volume ratio.

Findings:

Genetic analysis, including haplotype analysis and mutation screening of known EA genes (CACNA1A, EAAT1, KCNA1), did not identify any causative mutations.
Known EA loci (EA2, EA5, EA6, EA7) were excluded, ruling out common genetic causes for this family's condition.

Implications:

This study identifies a novel phenotype of episodic ataxia characterized by late onset and progressive cerebellar signs.
The exclusion of known EA genes suggests the involvement of unidentified genetic factors, necessitating further research into the genetic basis of EA.
Understanding the genetic underpinnings of this new EA phenotype may lead to improved diagnostics and targeted therapies for patients with hereditary ataxias.