Monarch Disease Ontology id MONDO_0014052 (congenital myasthenic syndrome 8) is any congenital myasthenic syndrome in which the cause of the disease is a mutation in the AGRN gene. Also known as: AGRN congenital myasthenic syndrome, CMS8, congenital myasthenic syndrome 8 with pre- and postsynaptic defects, congenital myasthenic syndrome caused by mutation in AGRN, congenital myasthenic syndrome due to agrin deficiency, congenital myasthenic syndrome type 8, myasthenic syndrome, congenital, 8, with pre- and postsynaptic defects, myasthenic syndrome, congenital, type 8.