Characterization of the mitofusin 2 R94W mutation in a knock-in mouse model

Alleene V. Strickland, Adriana P. Rebelo, Fan Zhang, Justin Price, Brad Bolon, Jose P. Silva, Rong Wen, Stephan L Zuchner

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Charcot-Marie-Tooth disease (CMT) comprises a group of heterogeneous peripheral axonopathies affecting 1 in 2,500 individuals. As mutations in several genes cause axonal degeneration in CMT type 2, mutations in mitofusin 2 (MFN2) account for approximately 90% of the most severe cases, making it the most common cause of inherited peripheral axonal degeneration. MFN2 is an integral mitochondrial outer membrane protein that plays a major role in mitochondrial fusion and motility; yet the mechanism by which dominant mutations in this protein lead to neurodegeneration is still not fully understood. Furthermore, future pre-clinical drug trials will be in need of validated rodent models. We have generated a Mfn2 knock-in mouse model expressing Mfn2R94W, which was originally identified in CMT patients. We have performed behavioral, morphological, and biochemical studies to investigate the consequences of this mutation. Homozygous inheritance leads to premature death at P1, as well as mitochondrial dysfunction, including increased mitochondrial fragmentation in mouse embryonic fibroblasts and decreased ATP levels in newborn brains. Mfn2R94W heterozygous mice show histopathology and age-dependent open-field test abnormalities, which support a mild peripheral neuropathy. Although behavior does not mimic the severity of the human disease phenotype, this mouse can provide useful tissues for studying molecular pathways associated with MFN2 point mutations.

Original languageEnglish (US)
Pages (from-to)152-164
Number of pages13
JournalJournal of the Peripheral Nervous System
Volume19
Issue number2
DOIs
StatePublished - Jun 1 2014

Fingerprint

Charcot-Marie-Tooth Disease
Mutation
Mitochondrial Dynamics
Premature Mortality
Peripheral Nervous System Diseases
Point Mutation
Rodentia
Membrane Proteins
Fibroblasts
Adenosine Triphosphate
Clinical Trials
Newborn Infant
Phenotype
Brain
Pharmaceutical Preparations
Genes
Proteins

Keywords

  • Charcot-Marie-Tooth
  • Mitofusin 2
  • Mouse model
  • Peripheral disease model

ASJC Scopus subject areas

  • Clinical Neurology
  • Neuroscience(all)

Cite this

Characterization of the mitofusin 2 R94W mutation in a knock-in mouse model. / Strickland, Alleene V.; Rebelo, Adriana P.; Zhang, Fan; Price, Justin; Bolon, Brad; Silva, Jose P.; Wen, Rong; Zuchner, Stephan L.

In: Journal of the Peripheral Nervous System, Vol. 19, No. 2, 01.06.2014, p. 152-164.

Research output: Contribution to journalArticle

Strickland, Alleene V. ; Rebelo, Adriana P. ; Zhang, Fan ; Price, Justin ; Bolon, Brad ; Silva, Jose P. ; Wen, Rong ; Zuchner, Stephan L. / Characterization of the mitofusin 2 R94W mutation in a knock-in mouse model. In: Journal of the Peripheral Nervous System. 2014 ; Vol. 19, No. 2. pp. 152-164.
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