Plays a key role in glycolysis and gluconeogenesis. In addition, may also function as scaffolding protein. Defects in ALDOA are the cause of glycogen storage disease type 12 (GSD12) [MIM:611881]; also known as red cell aldolase deficiency. A metabolic disorder associated with increased hepatic glycogen and hemolytic anemia. It may lead to myopathy with exercise intolerance and rhabdomyolysis. Belongs to the class I fructose-bisphosphate aldolase family.