Laboratory for Molecular Diagnostics
Center for Nephrology and Metabolic Disorders

Mitochondrial methylmalonic aciduria type B protein

The MMAB gene encodes an enzyme involved in cobalamin metabolism. Mutations cause autosomal recessive homocystinuria-megaloblastic anemia cblB.


Clinic Method Carrier testing
Turnaround 5 days
Specimen type genomic DNA
Research Method Genomic sequencing of the entire coding region
Turnaround 25 days
Specimen type genomic DNA
Clinic Method Massive parallel sequencing
Turnaround 25 days
Specimen type genomic DNA

Related Diseases:

Methylmalonic aciduria cblB



Johnson CL et. al. (2001) Functional genomic, biochemical, and genetic characterization of the Salmonella pduO gene, an ATP:cob(I)alamin adenosyltransferase gene.


Dobson CM et. al. (2002) Identification of the gene responsible for the cblB complementation group of vitamin B12-dependent methylmalonic aciduria.


Jorge-Finnigan A et. al. (2010) Functional and structural analysis of five mutations identified in methylmalonic aciduria cblB type.


Brasil S et. al. (2015) Methylmalonic aciduria cblB type: characterization of two novel mutations and mitochondrial dysfunction studies.

Update: Sept. 26, 2018