Genetic cerebellar ataxias.

Area of Science:

• Neurology
• Genetics
• Clinical Medicine

Background:

• The last two decades have seen a significant increase in the identification of genetic ataxias.
• Dominant ataxias, particularly spinocerebellar ataxias (SCAs), are often caused by (CAG)n repeat expansions.
• Recessive ataxias encompass a range of disorders, including Friedreich ataxia and ataxia telangiectasia.

Purpose of the Study:

• To provide a comprehensive overview of common genetic ataxias.
• To focus on the clinical features differentiating these ataxias.
• To guide neurologists in diagnosis and ongoing patient management.

Main Methods:

• Literature review of genetic ataxias.
• Analysis of clinical and radiological features for differential diagnosis.
• Discussion of diagnostic challenges and management strategies.

Main Results:

• Over half of dominant SCAs result from (CAG)n repeat expansions.
• Key recessive ataxias include Friedreich, ataxia telangiectasia, ARSACS, AOA1/2, and POLG syndromes.
• Dominant episodic ataxias (EA1, EA2) and fragile-X tremor ataxia syndrome are also discussed.

Conclusions:

• Clinical and radiological features, alongside population prevalence, aid in differentiating SCAs.
• Recognizing treatable recessive ataxias like AVED is crucial.
• Neurologists play a vital role in both diagnosis and long-term management of genetic ataxias.