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<dc:title xml:lang="en">Deciphering the functional and molecular differences between MTM1 and MTMR2 to better understand two neuromuscular diseases</dc:title>
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<dc:subject xml:lang="en">X-linked centronuclear myopathy</dc:subject>
<dc:subject xml:lang="en">Myotubularin</dc:subject>
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<dcterms:abstract xml:lang="fr">MTM1 et MTMR2 sont 2 phosphatases de phosphoinositides appartenant à la famille des myotubularines, conservée pendant l’évolution. Bien qu’étant très similaires, des mutations dans MTM1 entraînent la sévère myopathie XLCNM alors que les mutations dans MTMR2 entraînent la neuropathie CMT4B. On ne comprend pas encore les bases moléculaires de cette spécificité de tissu, et il n’existe aucun traitement spécifique pour ces maladies. J’ai tout d’abord caractérisé l’activité des 2 isoformes endogènes de MTMR2, nommés MTMR2-L et MTMR2-S. J’ai démontré que la différence fonctionnelle entre MTM1 et MTMR2 s’explique principalement par l’extension N-terminale de MTMR2, et que l’isoforme MTMR2-S dépourvu de cette extension entraîne les mêmes phénotypes que MTM1. Ensuite, grâce à l’injection d’AAV dans les souris Mtm1 KO, j’ai démontré que l’expression exogène des isoformes de MTMR2, et surtout de MTMR2-S, améliore grandement l’atrophie musculaire, la force musculaire et les marqueurs histologiques de ces souris myopathiques. Ces résultats révèlent une première base moléculaire expliquant les spécificités fonctionnelles de MTM1 et MTMR2, et montrent que MTMR2 est une cible thérapeutique potentielle pour la myopathie XLCNM.</dcterms:abstract>
<dcterms:abstract xml:lang="en">MTM1 and MTMR2 are 2 phosphatases of phosphoinositides that belong to the myotubularin family conserved through evolution. Despite their high level of similarity, mutations in MTM1 lead to the severe XLCNM myopathy while mutations in MTMR2 lead to the CMT4B neuropathy. The molecular bases for the surprising tissue-specific functions of these ubiquitously expressed proteins was unclear. Moreover, there is no specific therapy for these diseases.I first characterized the activity of the two naturally occurring isoforms of MTMR2, that we named MTMR2-L (long) and MTMR2-S (short). I found that the functional differences between MTM1 and MTMR2 reside mostly in the N-terminal extension of MTMR2-L, and that the endogenous MTMR2-S isoform lacking this N-terminal extension behaves similarly as MTM1. Then, using the myopathic Mtm1 KO mouse and AAV-mediated expression, I showed that exogenous expression of MTMR2 isoforms, and specifically of MTMR2-S, strongly improved the muscle atrophy, muscle force and the histological hallmarks of the myopathic mice. These data reveal a first molecular basis for the functional specificities of MTM1 and MTMR2, and highlight MTMR2 as a therapeutic target for XLCNM myopathy.</dcterms:abstract>
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