An autosomal recessive form of methylmalonic aciduria, caused by mutation(s) in the MMAA gene, encoding MMAA protein. The disease is methylmalonic aciduria, cblA type (MONDO_0009613, a Monarch Disease Ontology entry). Also known as: Methylmalonic aciduria, vitamin B12-responsive, cblA type, cobalamin A disease, cobalamin B disease, methylmalonic acidemia cblA type, methylmalonic acidemia, cblA type, methylmalonic aciduria cblA type, methylmalonic aciduria, vitamin B12-responsive due to a defect in synthesis of adenosylcobalamin cb1A type, methylmalonic aciduria, vitamin B12-responsive due to a defect in synthesis of adenosylcobalamin cblA type.