Developmental defects and neuromuscular alterations due to mitofusin 2 gene (MFN2) silencing in zebrafish: a new model for Charcot-Marie-Tooth type 2A neuropathy

2011 ◽  
Vol 21 (1) ◽  
pp. 58-67 ◽  
Author(s):  
Andrea Vettori ◽  
Giorgia Bergamin ◽  
Enrico Moro ◽  
Giovanni Vazza ◽  
Giulia Polo ◽  
...  
2019 ◽  
Vol 116 (6) ◽  
pp. 2328-2337 ◽  
Author(s):  
Nathalie Bernard-Marissal ◽  
Gerben van Hameren ◽  
Manisha Juneja ◽  
Christophe Pellegrino ◽  
Lauri Louhivuori ◽  
...  

Mutations in theMFN2gene encoding Mitofusin 2 lead to the development of Charcot–Marie–Tooth type 2A (CMT2A), a dominant axonal form of peripheral neuropathy. Mitofusin 2 is localized at both the outer membrane of mitochondria and the endoplasmic reticulum and is particularly enriched at specialized contact regions known as mitochondria-associated membranes (MAM). We observed that expression of MFN2R94Qinduces distal axonal degeneration in the absence of overt neuronal death. The presence of mutant protein leads to reduction in endoplasmic reticulum and mitochondria contacts in CMT2A patient-derived fibroblasts, in primary neurons and in vivo, in motoneurons of a mouse model of CMT2A. These changes are concomitant with endoplasmic reticulum stress, calcium handling defects, and changes in the geometry and axonal transport of mitochondria. Importantly, pharmacological treatments reinforcing endoplasmic reticulum–mitochondria cross-talk, or reducing endoplasmic reticulum stress, restore the mitochondria morphology and prevent axonal degeneration. These results highlight defects in MAM as a cellular mechanism contributing to CMT2A pathology mediated by mutated MFN2.


2008 ◽  
Vol 211 (1) ◽  
pp. 115-127 ◽  
Author(s):  
Elizabeth A. Amiott ◽  
Paul Lott ◽  
Jamie Soto ◽  
Peter B. Kang ◽  
J. Michael McCaffery ◽  
...  

Author(s):  
Stefano Tozza ◽  
Dario Bruzzese ◽  
Daniele Severi ◽  
Emanuele Spina ◽  
Rosa Iodice ◽  
...  

Abstract Introduction In Charcot-Marie-Tooth type 1A (CMT1A) patients, daily life is mainly influenced by mobility and ambulation dysfunctions. The aim of our work was to evaluate the perception of disturbances that mostly impact on daily life in CMT1A patients and its difference on the basis of age, gender, disability, and quality of life. Methods Forty-one CMT1A patients underwent neurological assessment focused on establishing clinical disability through the Charcot-Marie-Tooth Neuropathy Score (CMTNS) and quality of life through the Short Form-36 (SF-36) questionnaire. We identified from CMT disturbances 5 categories [weakness in lower limbs (WLL), weakness in upper limbs (WUL), skeletal deformities (SD), sensory symptoms (SS), balance (B)] and patients classified the categories from the highest to the lowest impact on daily life (1: highest; 5: lowest). Ranking of the 5 categories, in the overall sample and in the different subgroups (dividing by gender, median of age and disease duration, CMTNS, domains of SF-36), was obtained and differences among subgroups were assessed using a bootstrap approach. Results Rank analysis showed that WLL was the most important disturbance on daily life whereas WUL had the lowest impact. In the older CMT1A group, the most important disturbance on daily life was B that was also the most relevant disturbance in patients with a greater disability. SD influenced daily life in younger patients. SS had less impact on daily life, with the exception of patients with a milder disability. Discussion Our findings demonstrated that the perception of disturbances that mostly impact on CMT1A patients’ daily life changes over the lifetime and with degree of disability.


2021 ◽  
Vol 31 (1) ◽  
pp. 56-68
Author(s):  
Fredrik S. Skedsmo ◽  
Arild Espenes ◽  
Michael A. Tranulis ◽  
Kaspar Matiasek ◽  
Gjermund Gunnes ◽  
...  

2017 ◽  
Vol 25 (2) ◽  
pp. 301-306 ◽  
Author(s):  
S. Tozza ◽  
D. Bruzzese ◽  
C. Pisciotta ◽  
R. Iodice ◽  
M. Esposito ◽  
...  

2006 ◽  
Vol 117 ◽  
pp. 1-2
Author(s):  
C. Verhamme ◽  
I.N. Van Schaik ◽  
J. Koelman ◽  
M. Vermeulen ◽  
M. De Visser

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