primary coenzyme Q10 deficiency 8 (Monarch Disease Ontology entry MONDO_0014754) is any coenzyme Q10 deficiency in which the cause of the disease is a mutation in the COQ7 gene. Also known as: COQ10D8, COQ7 coenzyme Q10 deficiency, coenzyme Q10 deficiency caused by mutation in COQ7, coenzyme Q10 deficiency, primary, 8, coenzyme Q10 deficiency, primary, type 8.