Malonyl-Coa Decarboxylase Deficiency, also known as malonic aciduria, is related to combined malonic and methylmalonic aciduria and atrial standstill 1, and has symptoms including abdominal pain, diarrhea and seizures. An important gene associated with Malonyl-Coa Decarboxylase Deficiency is MLYCD (Malonyl-CoA Decarboxylase). Affiliated tissues include heart and brain, and related phenotypes are pachygyria and intellectual disability