Primary deficiency of coenzyme Q10 deficiency‐4 (COQ10D4) is an autosomal recessive cerebellar ataxia with mitochondrial respiratory chain disfunction. The main clinical manifestation involves early‐onset exercise intolerance, progressive cerebellar ataxia, and movement disorders. COQ8A gene mutations are responsible for this disease. Here, we provide clinical, laboratory, and genetic findings of a patient with cerebellar ataxia caused by compound heterozygous mutations in COQ8A gene.
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