Methylmalonic aciduria (MMA) is caused by a deficiency of methylmalonyl-CoA mutase (mut type), which is a vitamin B12-dependent enzyme. Defects of adenosylcobalamin metabolism lead to variant forms of MMA (cblA and cblB type).
Category
Inherited metabolic disorder
Brite
Human diseases in ICD-11 classification [BR:br08403]
05 Endocrine, nutritional or metabolic diseases
Metabolic disorders
Inborn errors of metabolism
5C50 Inborn errors of amino acid or other organic acid metabolism
H00174 Methylmalonic aciduria
Pathway-based classification of diseases [BR:br08402]
Amino acid metabolism
nt06024 Valine, leucine and isoleucine degradation
H00174 Methylmalonic aciduria
Cofactor/vitamin metabolism
nt06538 Cobalamin transport and metabolism
H00174 Methylmalonic aciduria
Dobson CM, Wai T, Leclerc D, Wilson A, Wu X, Dore C, Hudson T, Rosenblatt DS, Gravel RA
Title
Identification of the gene responsible for the cblA complementation group of vitamin B12-responsive methylmalonic acidemia based on analysis of prokaryotic gene arrangements.
Quadros EV, Lai SC, Nakayama Y, Sequeira JM, Hannibal L, Wang S, Jacobsen DW, Fedosov S, Wright E, Gallagher RC, Anastasio N, Watkins D, Rosenblatt DS
Title
Positive newborn screen for methylmalonic aciduria identifies the first mutation in TCblR/CD320, the gene for cellular uptake of transcobalamin-bound vitamin B(12).