Homozygous mutations in VAMP 1 cause a presynaptic congenital myasthenic syndrome

We report 2 families with undiagnosed recessive presynaptic congenital myasthenic syndrome (CMS). Whole exome or genome sequencing identified segregating homozygous variants in VAMP1: c.51_64delAGGTGGGGGTCCCC in a Kuwaiti family and c.146G>C in an Israeli family. VAMP1 is crucial for vesicle fusi...

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Detalles Bibliográficos
Autores principales: Salpietro, Vincenzo, Lin, Weichun, Vedove, Andrea Delle, Storbeck, Markus, Liu, Yun, Efthymiou, Stephanie, Manole, Andreea, Wiethoff, Sarah, Ye, Qiaohong, Saggar, Anand, McElreavey, Kenneth, Krishnakumar, Shyam S., Pitt, Matthew, Bello, Oscar D., Rothman, James E., Basel‐Vanagaite, Lina, Hubshman, Monika Weisz, Aharoni, Sharon, Manzur, Adnan Y., Wirth, Brunhilde, Houlden, Henry
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2017
Materias:
Brief Communications
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5413866/
https://www.ncbi.nlm.nih.gov/pubmed/28253535
http://dx.doi.org/10.1002/ana.24905
Descripción
Sumario:We report 2 families with undiagnosed recessive presynaptic congenital myasthenic syndrome (CMS). Whole exome or genome sequencing identified segregating homozygous variants in VAMP1: c.51_64delAGGTGGGGGTCCCC in a Kuwaiti family and c.146G>C in an Israeli family. VAMP1 is crucial for vesicle fusion at presynaptic neuromuscular junction (NMJ). Electrodiagnostic examination showed severely low compound muscle action potentials and presynaptic impairment. We assessed the effect of the nonsense mutation on mRNA levels and evaluated the NMJ transmission in VAMP1 (lew/lew) mice, observing neurophysiological features of presynaptic impairment, similar to the patients. Taken together, our findings highlight VAMP1 homozygous mutations as a cause of presynaptic CMS. Ann Neurol 2017;81:597–603

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