Glycogen storage disease due to aldolase A deficiency

Glycogen storage disease due to aldolase A deficiency (also known as red cell aldolase deficiency or GSD type XII) is an extremely rare inherited metabolic disorder caused by mutations in the ALDOA gene, which encodes the enzyme aldolase A (fructose-1,6-bisphosphate aldolase A). Aldolase A is a key enzyme in glycolysis, the metabolic pathway that breaks down glucose for energy. It is the predominant aldolase isoform expressed in red blood cells and skeletal muscle. Deficiency of this enzyme disrupts normal glucose metabolism in these tissues, leading to a combination of hemolytic anemia and myopathy. The clinical features of this condition primarily affect the hematologic and musculoskeletal systems. Patients typically present with chronic hemolytic anemia, which results from the inability of red blood cells to efficiently metabolize glucose, leading to their premature destruction. Skeletal muscle involvement manifests as exercise intolerance, muscle weakness, and episodes of rhabdomyolysis (muscle breakdown). Some patients may also experience episodes of jaundice related to hemolysis. Intellectual disability and developmental delay have been reported in some cases, suggesting possible central nervous system involvement, as the brain also relies heavily on glycolysis for energy production. Hepatomegaly and elevated serum creatine kinase levels may also be observed. There is currently no specific curative treatment for glycogen storage disease due to aldolase A deficiency. Management is primarily supportive and symptomatic. This may include blood transfusions for severe anemia, avoidance of strenuous physical activity to reduce the risk of rhabdomyolysis, and careful monitoring of organ function. Folic acid supplementation may be recommended to support red blood cell production in the setting of chronic hemolysis. Given the extreme rarity of this condition, with only a handful of cases reported in the medical literature, clinical experience is limited and management strategies are largely individualized.

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