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Aberrant Molecular Myelin Architecture in Charcot–Marie–Tooth Disease Type 1A and Hereditary Neuropathy With Liability to Pressure Palsies
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Abstract
Charcot–Marie–Tooth Disease Type 1A (CMT1A) and Hereditary Neuropathy with Liability to Pressure Palsies (HNPP) are the most common inherited peripheral neuropathies and arise from copy number variation of the Peripheral Myelin Protein 22 ( PMP22 ) gene. While secondary axon degeneration has been proposed as the primary driver of disability, our prior work demonstrated pronounced neuromuscular impairment in CMT1A model mice in the absence of overt axonal loss, prompting investigation into primary myelin dysfunction. Here, we reveal that altered PMP22 dosage profoundly disrupts molecular architecture at critical myelin domains, Schmidt‐Lanterman incisures (SLIs) and Nodes of Ranvier. Using high‐resolution confocal imaging of teased peripheral nerve fibers from CMT1A and HNPP model mice, we identified widespread disorganization of adherens junctions, mislocalization of Connexin29 and aberrant distribution of nodal ion channels, with several defects more severe in CMT1A, consistent with disease burden. Notably, nodal widening and abnormal spreading of Kv1.2 and Caspr along internodes indicate compromised axo‐glial compartmentalization essential for saltatory conduction. Together, these findings support a model in which PMP22 functions as a structural organizer of myelin, coordinating adherens junction patterning and nodal subdomain integrity. Dysregulation of this function is predicted to compromise Schwann‐cell architecture, metabolic support and axonal excitability. Our findings support a paradigm shift in which molecular destabilization of myelin, rather than secondary axonal degeneration alone, contributes to disease progression in CMT1A and HNPP. This work also identifies junctional complexes as potential actionable molecular targets and establishes a mechanistic framework applicable to a broad spectrum of inherited dysmyelinating and acquired demyelinating neuropathies.
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![FIGURE 1 PMP22 exhibits structural homology to Claudins suggesting a role in myelin adhesion. (a) PMP22 is a member of the Claudin superfamily of proteins. Orthodox Claudins establish selective barriers as components of tight junctions and as such PMP22 protein topology is homologous. Topology for human PMP22, adapted from (Marinko et al. 2020). (b) AlphaFold predicted structures of human Claudin‐1 and human PMP22 ECLs viewed from above (AlphaFold Protein Structure Database (Jumper et al. 2021)). The structural similarity between the ECLs of human Claudin‐1 and human PMP22 is striking suggesting that PMP22 functions similarly to Claudin proteins. (c) Adhesion junctions, including adherens junctions and tight junctions, are localized to specialized cytoplasmic‐like compartments in peripheral nerve myelin including Schmidt‐Lanterman Incisures (SLIs) and Nodes of Ranvier. Created in https://BioRender.com. (d) 3‐month‐old WT (C57BL/6J) teased tibial nerve fibers immunostained for the adherens junction protein E‐Cadherin (red) showing prominent localization at SLIs (marked by F‐Actin [blue], arrows), Nodes of Ranvier (marked by pan Neurofascin [NF, green], arrowheads) and inner mesaxons. Scale bar, 10 μm.](/paper-figures/7639a8daa0564aee8241330d175f7dce/aberrant-molecular-myelin-architecture-in-charcotmarietooth-disease-type-scp-1a-figure-1.jpg)







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Highly accurate protein structure prediction with AlphaFold
Jumper, J., Evans, R., Pritzel, A., Green, T., Figurnov, M., Ronneberger, O., Tunyasuvunakool, K., Bates, R., Žídek, A., Potapenko, A., et al. (2021) · Nature · doi:10.1038/s41586-021-03819-2 · Cited by 43,764
Adherens junctions as molecular regulators of emergent tissue mechanics
Campàs, O., Noordstra, I., & Yap, A. S. (2024) · Nature Reviews Molecular Cell Biology · doi:10.1038/s41580-023-00688-7 · Cited by 149
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Metadata
- Authors
- Moss, K. R., Arowolo, M. A., Gutierrez, D. R., & Höke, A.
- Affiliations
- University of Missouri Health System (US)
- Johns Hopkins University (US)
- Corresponding author
- Moss, Kathryn R.
- Venue
- Glia
- Publisher
- Wiley
- Published
- 2025-12-16
- Volume
- 74
- Issue
- 2
- Pages
- e70124-e70124
- ISSN
- 0894-1491 (ISSN-L)
- 1098-1136
- PMC
- PMC12706824
- OpenAlex
- W4417427233
- Cited by
- 2
- References
- 2
- Citations by year
- 2026: 2
- FWCI
- 0.78
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Locations
- Glia (publishedVersion, cc-by)
- bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion)
- Europe PMC (PubMed Central) (publishedVersion, cc-by)
- PubMed (publishedVersion)
- PubMed Central (publishedVersion, cc-by)
- Funders
- National Institute of Neurological Disorders and Stroke (K22NS125057)
- Topics
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Hereditary Neurological Disorders
- Health Sciences › Medicine › Clinical Neurology › Peripheral Neuropathies and Disorders
- Health Sciences › Medicine › Oncology › Cancer Treatment and Pharmacology
- Keywords
- Charcot-Marie-Tooth disease type 1A, hereditary neuropathy with liability to pressure palsies, Schmidt-Lanterman incisures, nodes of Ranvier, adherens junctions, Kv1.2, Caspr, saltatory conduction, Schwann cells, demyelinating neuropathy, peripheral nerve myelin
- MeSH terms
- Animals, Arthrogryposis, Axons, Charcot-Marie-Tooth Disease, Disease Models, Animal, Male, Mice, Inbred C57BL, Mice, Transgenic, Myelin Proteins, Myelin Sheath, Ranvier's Nodes, Hereditary Sensory and Motor Neuropathy, Connexins, Mice
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- The paper
- Moss, K. R., Arowolo, M. A., Gutierrez, D. R., & Höke, A. (2026). Aberrant Molecular Myelin Architecture in Charcot–Marie–Tooth Disease Type 1A and Hereditary Neuropathy With Liability to Pressure Palsies. Glia. https://doi.org/10.1002/glia.70124