Natural history of a mouse model of X-linked myotubular myopathy.

Natural history of a mouse model of X-linked myotubular myopathy.
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X连锁肌管肌病小鼠模型的自然史。

DOI:
10.1242/dmm.049342
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发表时间:
2022-07-01
影响因子:
4.3
通讯作者:
--
中科院分区:
医学2区
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X连锁肌管性肌病(XLMTM)是一种严重的骨骼肌单基因疾病。它是由肌管蛋白(MTM 1)基因的表达/功能缺失突变引起的。关于这种疾病的大部分已知信息以及治疗策略已经通过临床前模型的实验,特别是Mtm 1基因敲除小鼠系(Mtm 1 KO)发现。尽管有这种理解,并确定潜在的治疗方法,仍然有很多关于XLMTM疾病的病理机制,以及MTM 1在肌肉发育中的正常功能有待了解。为了为解决这些知识空白奠定基础,我们对Mtm 1 KO小鼠进行了自然史研究。这包括运动表型、转录组和蛋白质组谱、肌肉结构和靶向分子通路的纵向比较分析。我们确定了基因表达、线粒体功能、肌纤维大小和关键分子标记物(包括DNM 2)的年龄相关变化。重要的是,一些分子和组织病理学变化之前明显的表型变化,而其他人,如三联体结构的变化,发生巧合的存在严重的弱点。总之,这项研究提供了一个全面的纵向评价小鼠XLMTM疾病的过程,从而为未来的调查提供了一个关键的框架。总结:这项研究提供了一个全面的和纵向的分子和表型评估的疾病过程中的X-连锁肌管性肌病(XLMTM)在小鼠模型。
X-linked myotubular myopathy (XLMTM) is a severe monogenetic disorder of the skeletal muscle. It is caused by loss-of-expression/function mutations in the myotubularin (MTM1) gene. Much of what is known about the disease, as well as the treatment strategies, has been uncovered through experimentation in pre-clinical models, particularly the Mtm1 gene knockout mouse line (Mtm1 KO). Despite this understanding, and the identification of potential therapies, much remains to be understood about XLMTM disease pathomechanisms, and about the normal functions of MTM1 in muscle development. To lay the groundwork for addressing these knowledge gaps, we performed a natural history study of Mtm1 KO mice. This included longitudinal comparative analyses of motor phenotype, transcriptome and proteome profiles, muscle structure and targeted molecular pathways. We identified age-associated changes in gene expression, mitochondrial function, myofiber size and key molecular markers, including DNM2. Importantly, some molecular and histopathologic changes preceded overt phenotypic changes, while others, such as triad structural alternations, occurred coincidentally with the presence of severe weakness. In total, this study provides a comprehensive longitudinal evaluation of the murine XLMTM disease process, and thus provides a critical framework for future investigations. Summary: This study provides a comprehensive and longitudinal molecular and phenotypic evaluation of the disease process of X-linked myotubular myopathy (XLMTM) in a murine model.
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