Abstract
GNE myopathy is a recessive adult onset, slowly progressive distal and proximal myopathy, caused by mutations in the GNE gene. The most frequent mutation in GNE myopathy patients is the Middle Eastern founder mutation M712T. We have generated Gne M712T/M712T knockin mice. A high mortality rate in the first generation due to renal failure was recorded (as previously described). However, the following Gne M712T/M712T offspring generations could be classified into 3 phenotypic categories: severe, mild and without apparent phenotype. By further crossing between mice with no apparent phenotype, we were able to establish a colony of Gne M712T/M712T knockin mice with a high- and long-term survival rate, lacking any renal phenotype. These mice did not present any muscle phenotype (clinical or pathological) for up to 18 months. No correlation was found between the expression of any of the two mRNA Gne isoforms in muscle and the mouse genotype or phenotype. However, the expression of isoform 2 mRNA was significantly higher in the kidney of Gne M712T/M712T kidney affected mice compared with control. In contrast, the expression of UPR markers Bip, Chop and of the spliced form of XBP1, was upregulated in muscle of Gne M712T/M712T mice compared with controls, but was unchanged in the affected kidney. Thus, Gne defects can affect both muscle and kidney in mouse, but probably through different mechanisms.
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Acknowledgments
We thank Rebecca Haffner, Weizmann Institute of Sciences, for her directions in the mouse generation process and for helpful discussions, and Ynon Ben-Neriah, The Hebrew University—Hadassah Medical School, Jerusalem, for kindly providing C57BL/6J-Tg-PGK-Cre mice. This project was supported in part by the Neuromuscular Disease Foundation (NDF).
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Sela, I., Yakovlev, L., Becker Cohen, M. et al. Variable Phenotypes of Knockin Mice Carrying the M712T Gne Mutation. Neuromol Med 15, 180–191 (2013). https://doi.org/10.1007/s12017-012-8209-7
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DOI: https://doi.org/10.1007/s12017-012-8209-7