Mitochondrial ataxias.

Area of Science:

• Neurology
• Genetics
• Metabolic Disorders

Background:

• Mitochondrial disorders (MIDs) are increasingly recognized as a significant cause of neurological dysfunction.
• The central nervous system is the second most commonly affected organ system in MIDs.
• Ataxia is a prevalent clinical manifestation of MIDs, sometimes being the dominant symptom.

Purpose of the Study:

• To highlight the importance of considering MIDs in the differential diagnosis of heredoataxias.
• To review MIDs associated with ataxia, categorized by genetic origin (mitochondrial DNA vs. nuclear DNA).
• To emphasize the need for distinguishing syndromic and non-syndromic MIDs with ataxia from classical heredoataxias for appropriate treatment.

Main Methods:

• Literature review and synthesis of existing data on MIDs and ataxia.
• Classification of MIDs associated with ataxia based on genetic mutations (mtDNA and nDNA).
• Analysis of the frequency and clinical presentation of ataxia in various MID syndromes.

Main Results:

• Numerous MIDs, both syndromic and non-syndromic, are associated with ataxia.
• Specific mtDNA mutations (MERRF, NARP, MILS, KSS) and nDNA mutations (LS, SANDO, SCAE, etc.) frequently present with ataxia.
• Non-syndromic MIDs are most frequently associated with ataxia.

Conclusions:

• Ataxia is a key neurological symptom that warrants investigation for underlying MIDs.
• Accurate classification of MIDs with ataxia is essential for effective symptomatic and supportive care.
• Inclusion of MIDs in heredoataxia classifications or as differentials is clinically relevant.