期刊
HUMAN MUTATION
卷 43, 期 2, 页码 169-179出版社
WILEY-HINDAWI
DOI: 10.1002/humu.24307
关键词
centronuclear myopathy; DNM2; in cellulo assay; membrane remodeling; T-tubules
资金
- Japan Society for the Promotion of Science [18K07198, 19H03225, 19J12028, 19KK0180]
- National Center of Neurology and Psychiatry [2-5, 29-4, 3-9, 2-6]
- Takeda Science Foundation
- Japan Agency for Medical Research and Development [JP21ek0109490h0002]
- Wesco Science Foundation
- Grants-in-Aid for Scientific Research [18K07198, 19KK0180, 19J12028, 19H03225] Funding Source: KAKEN
Centronuclear myopathy (CNM) is a group of inherited congenital diseases characterized by clinically progressive muscle weakness and centralized myonuclei, diagnosed through genetic testing and muscle biopsy. A study identified five novel DNM2 variants and used a cell-based assay to establish the pathogenicity of these variants, showing correlations with biochemical features and clinicopathological phenotypes. This approach provides insights into the disease progression of DNM2-associated CNM by combining in cellulo assay with clinical information.
A centronuclear myopathy (CNM) is a group of inherited congenital diseases showing clinically progressive muscle weakness associated with the presence of centralized myonuclei, diagnosed by genetic testing and muscle biopsy. The gene encoding dynamin 2, DNM2, has been identified as a causative gene for an autosomal dominant form of CNM. However, the information of a DNM2 variant alone is not always sufficient to gain a definitive diagnosis as the pathogenicity of many gene variants is currently unknown. In this study, we identified five novel DNM2 variants in our cohort. To establish the pathogenicity of these variants without using clinicopathological information, we used a simple in cellulo imaging-based assay for T-tubule-like structures to provide quantitative data that enable objective determination of pathogenicity by novel DNM2 variants. With this assay, we demonstrated that the phenotypes induced by mutant dynamin 2 in cellulo are well correlated with biochemical gain-of-function features of mutant dynamin 2 as well as the clinicopathological phenotypes of each patient. Our approach of combining an in cellulo assay with clinical information of the patients also explains the course of a disease progression by the pathogenesis of each variant in DNM2-associated CNM.
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