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X-linked myopathy with excessive autophagy (XMEA), caused by mutations of the VMA21 gene, is a strictly skeletal muscle disease. Extensive studies in yeast established VMA21 as the master assembly chaperone of V-ATPase, the complex multisubunit proton pump that acidifies organelles and that is vital to all mammalian tissues. As such, skeletal muscle disease exclusivity in XMEA is highly surprising...
In X-linked myopathy with excessive autophagy (XMEA) progressive sarcoplasmic accumulation of autolysosomes filled with undegraded debris leads to atrophy and weakness of skeletal muscles. XMEA is caused by compromised acidification of lysosomes resulting from hypofunction of the proton pump vacuolar ATPase (V-ATPase), due to hypomorphic mutations in VMA21, whose protein product assembles V-ATPase...
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