3-Hydroxy-3-Methylglutaryl-Coa Synthase Deficiency, also known as hmg-coa synthase deficiency, is related to 3-hydroxy-3-methylglutaryl-coa synthase-2 deficiency and hypoglycemia, and has symptoms including diarrhea and vomiting. An important gene associated with 3-Hydroxy-3-Methylglutaryl-Coa Synthase Deficiency is HMGCS2 (3-Hydroxy-3-Methylglutaryl-CoA Synthase 2). Affiliated tissues include brain and liver, and related phenotypes are seizure and hypoglycemia