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myasthenic syndrome, congenital, 1B, fast-channel

Disease Summary
Associated Targets (3)
Tclin

3


Mondo Description A congenital myasthenic syndrome characterized by defects in postsynaptic neuromuscular junctions with early-onset progressive muscle weakness that has material basis in mutation in the CHRNA1 gene on chromosome 2q.
Uniprot Description A form of congenital myasthenic syndrome, a group of disorders characterized by failure of neuromuscular transmission, including pre-synaptic, synaptic, and post-synaptic disorders that are not of autoimmune origin. Clinical features are easy fatigability and muscle weakness affecting the axial and limb muscles (with hypotonia in early-onset forms), the ocular muscles (leading to ptosis and ophthalmoplegia), and the facial and bulbar musculature (affecting sucking and swallowing, and leading to dysphonia). The symptoms fluctuate and worsen with physical effort. CMS1B is a fast-channel myasthenic syndrome. It is caused by kinetic abnormalities of the AChR, resulting in brief opening and activity of the channel, with a rapid decay in endplate current, failure to achieve threshold depolarization of the endplate and consequent failure to fire an action potential.
Mondo Term and Equivalent IDs
MONDO:0012156:  myasthenic syndrome, congenital, 1B, fast-channel
UMLS:C1837122: 
UMLS:C4225405: