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Mtmr13/Sbf2-deficient mice: an animal model for CMT4B2
Kristian Tersar1, Matthias Boentert, Philipp Berger
1Institute of Cell Biology, Department of Biology, ETH Zürich, Switzerland.
Human Molecular Genetics
|September 15, 2007
Summary
Mice lacking the Set-Binding Factor-2 (SBF2) gene exhibit Charcot-Marie-Tooth disease (CMT4B2) hallmarks, including myelin defects and reduced motor function. This study establishes SBF2 as a key gene in CMT4B2 pathogenesis.
Area of Science:
- Genetics
- Neuroscience
- Molecular Biology
Background:
- Charcot-Marie-Tooth (CMT) disease is a common inherited neurological disorder.
- CMT subtypes CMT4B1 and CMT4B2 are linked to mutations in MTMR2 and MTMR13/SBF2 genes, respectively.
- Both subtypes present demyelinating neuropathy with focally folded myelin and reduced nerve conduction velocity (NCV).
Purpose of the Study:
- To confirm MTMR13/SBF2 as the causative gene for CMT4B2.
- To develop a mouse model for studying CMT4B2.
- To investigate the role of MTMR13/SBF2 in peripheral nerve myelination.
Main Methods:
- Generation of Mtmr13/Sbf2-deficient mice.
- Assessment of peripheral nerve pathology, including myelin outfoldings/infoldings.
- Evaluation of motor performance and electrophysiological parameters (NCV, compound motor action potential).
Main Results:
- Mtmr13/Sbf2-deficient mice displayed myelin outfoldings and infoldings, characteristic of CMT4B2.
- These mice showed decreased motor performance, progressive axonal degeneration, and reduced compound motor action potential amplitude with age.
- Mild NCV impairment was observed, indicated by prolonged F-wave latency.
Conclusions:
- Mtmr13/Sbf2 deficiency recapitulates key pathological and clinical features of CMT4B2 in mice.
- This mouse model is valuable for unraveling CMT4B pathogenesis.
- The study highlights the importance of MTMR13/SBF2 in phosphoinositide-mediated processes in peripheral nerves.
