Abstract
The hereditary motor and sensory neuropathies (also known as Charcot–Marie–Tooth disease or CMT) are characterized by a length-dependent loss of axonal integrity in the PNS, which leads to progressive muscle weakness and sensory deficits. The 'demyelinating' neuropathies (CMT disease types 1 and 4) are genetically heterogeneous, but their common feature is that the primary defect perturbs myelination. As we discuss in this Review, several new genes associated with CMT1 and CMT4 have recently been identified. The emerging view is that a range of different subcellular defects in Schwann cells can cause axonal loss, which represents the final common pathway of all CMT disease and is independent of demyelination. We propose that Schwann cells provide a first line of axonal neuroprotection. A better understanding of axon–glia interactions should open the way to therapeutic interventions for demyelinating neuropathies. Transgenic animal models have become essential for dissecting CMT disease mechanisms and exploring novel therapies.
Key Points
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The inherited demyelinating neuropathies Charcot–Marie–Tooth (CMT) disease types 1 and 4 are genetically heterogeneous, but their common feature is that the primary defect perturbs myelination
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All mutations that cause CMT1 have almost complete penetrance, and the mutated genes are expressed in myelinating Schwann cells
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The products of CMT-associated genes include not only structural components of myelin, but also proteins that have signalling and regulatory functions in Schwann cells
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Axonal loss seems to be the final common pathway of all CMT disease
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Knowing the primary causes of demyelination and obtaining insights into the downstream mechanisms of neuropathies are the first steps towards developing rational treatment strategies for CMT disease
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Acknowledgements
We thank the unknown reviewers of this manuscript for helpful suggestions, and apologize to our colleagues when publications could not be cited owing to space limitations. Work in the authors' laboratory was generously supported by grants from the Deutsche Forschungsgemeinschaft (Center for Molecular Biology of the Brain), Hertie Institute for Multiple Sclerosis Research, the US National Multiple Sclerosis Society, European Union (FP6), and private foundations (Del Marmol Fund, Liley Fund).
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Nave, KA., Sereda, M. & Ehrenreich, H. Mechanisms of Disease: inherited demyelinating neuropathies—from basic to clinical research. Nat Rev Neurol 3, 453–464 (2007). https://doi.org/10.1038/ncpneuro0583
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DOI: https://doi.org/10.1038/ncpneuro0583
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