Autosomal recessive ataxia due to PEX10 deficiency

Autosomal recessive ataxia due to PEX10 deficiency (also known as peroxisomal biogenesis disorder complementation group 7, or PEX10-related cerebellar ataxia) is a rare neurological condition caused by biallelic mutations in the PEX10 gene. The PEX10 gene encodes a peroxisomal membrane protein essential for peroxisome biogenesis and function. Peroxisomes are cellular organelles involved in the metabolism of very long-chain fatty acids, bile acid synthesis, and other critical biochemical pathways. Mutations in PEX10 can produce a spectrum of disease severity, ranging from severe neonatal forms within the Zellweger spectrum disorders to milder phenotypes presenting primarily as cerebellar ataxia in childhood or adulthood. In the milder ataxia-predominant form (Orphanet 247815), the primary body system affected is the central nervous system, particularly the cerebellum. Key clinical features include progressive cerebellar ataxia (impaired coordination and balance), sensorimotor neuropathy, and cerebellar atrophy visible on brain MRI. Patients may also experience hyperreflexia, dysarthria (slurred speech), oculomotor abnormalities, and cognitive difficulties. Some individuals may have subtle biochemical abnormalities of peroxisomal function, such as mildly elevated very long-chain fatty acids or abnormal phytanic acid levels, which can aid in diagnosis. There is currently no curative treatment for autosomal recessive ataxia due to PEX10 deficiency. Management is supportive and symptomatic, focusing on physical therapy and rehabilitation to maintain mobility and coordination, speech therapy for dysarthria, and occupational therapy for daily living activities. Monitoring of peroxisomal biochemical markers and neurological status is recommended. Genetic counseling is important for affected families. Research into peroxisomal disorders continues, but no disease-modifying therapies are currently available for this condition.

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