 Other differences are that patients with this disorder have less frequent but longer absence seizures than those with CAE.There are a number of possible genetic loci for this disorder, though no causative genes have been demonstrated.Also known as Janz syndrome, juvenile myoclonic epilepsy (JME) is a common form of epilepsy, accounting for ~10% of all cases and ~25% of cases of idiopathic generalized epilepsies.