A novel mutation in the TPR6 domain of the RAPSN gene associated with congenital myasthenic syndrome

We describe a Persian Jewish family with two siblings affected with typical CMS, harboring the common heterozygous (− 38A-G) E-box mutation associated with a previously unreported heterozygous p.224 insT causing an insertion of Threonine in the TPR6 domain. To the best of our knowledge, this is the first mutation in the TPR6 domain and might give supportive evidence to the role of this domain in rapsyn self association and consequently co-clustering with AchR in the post synaptic membrane.