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  • Title: Elevated urinary β2 microglobulin in the first identified Japanese family afflicted by X-linked myopathy with excessive autophagy.
    Author: Kurashige T, Takahashi T, Yamazaki Y, Nagano Y, Kondo K, Nakamura T, Yamawaki T, Tsuburaya R, Hayashi YK, Nonaka I, Nishino I, Matsumoto M.
    Journal: Neuromuscul Disord; 2013 Nov; 23(11):911-6. PubMed ID: 23850239.
    Abstract:
    Here we report what is to our knowledge the first identified Japanese family afflicted by X-linked myopathy with excessive autophagy. The index case is a 52-year-old man with almost 40years of progressive proximal muscle weakness. High urinary β2 microglobulin, normal serum β2 microglobulin, autophagic vacuoles with sarcolemmal features, and a hemizygous c.164-7T>G mutation in the VMA21 gene were found. His two maternal uncles had similar clinicopathological findings. High urinary β2 microglobulin without obvious renal dysfunction might result from decreased urine acidification in the distal convoluted tubules caused by the VMA21 gene mutation. These findings might prove to be useful as a preliminary marker suggestive of X-linked myopathy with excessive autophagy.
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