Methylmalonic aciduria and homocystinuria (MAHC) is caused by defects of intracellular cobalamin (vitamin B12) metabolism. Derivatives of cobalamin are essential cofactors for enzymes required in intermediary metabolism, and its defects lead to the accumulation of methylmalonic acid and/or homocysteine in blood and urine. Affected persons present with multisystem clinical abnormalities, including developmental, hematologic, neurologic, and metabolic findings.
Coelho D, Kim JC, Miousse IR, Fung S, du Moulin M, Buers I, Suormala T, Burda P, Frapolli M, Stucki M, Nurnberg P, Thiele H, Robenek H, Hohne W, Longo N, Pasquali M, Mengel E, Watkins D, Shoubridge EA, Majewski J, Rosenblatt DS, Fowler B, Rutsch F, Baumgartner MR
タイトル
Mutations in ABCD4 cause a new inborn error of vitamin B12 metabolism.