MPZ — Myelin Protein Zero
<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">MPZ — Myelin Protein Zero</th>
</tr>
<tr> [@ncbi]
<td class="label">Symbol</td> [@omim]
<td><strong>MPZ</strong></td> [@uniprot]
</tr>
<tr>
<td class="label">Full Name</td>
<td>Myelin Protein Zero</td>
</tr>
<tr>
<td class="label">Chromosome</td>
<td>1q23.3</td>
</tr>
<tr>
<td class="label">NCBI Gene</td>
<td><a href="https://www.ncbi.nlm.nih.gov/gene/4240" target="_blank">4240</a></td>
</tr>
<tr>
<td class="label">Ensembl</td>
<td><a href="https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000156675" target="_blank">ENSG00000156675</a></td>
</tr>
<tr>
<td class="label">OMIM</td>
<td><a href="https://omim.org/entry/159440" target="_blank">159440</a></td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/P07846" target="_blank">P07846</a></td>
</tr>
<tr>
<td class="label">Diseases</td>
<td>[Charcot-Marie-Tooth Disease Type 1B](/diseases/charcot-marie-tooth), [Dejerine-Sottas Syndrome](/diseases/dejerine-sottas)</td>
</tr>
<tr>
<td class="label">Expression</td>
<td>Peripheral nervous system, Schwann cells</td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">12 edges</a></td>
</tr>
</table>
MPZ — Myelin Protein Zero
Introduction
Mpz — Myelin Protein Zero is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
Overview
Mermaid diagram (expand to render)
MPZ ([Myelin Protein Zero](/proteins/mpz-protein)) is a gene located on chromosome 1q23.3 that encodes the major protein component of peripheral nerve myelin. Mutations in MPZ cause Charcot-Marie-Tooth disease type 1B (CMT1B) and other inherited neuropathies. The gene is catalogued as NCBI Gene ID [4240](https://www.ncbi.nlm.nih.gov/gene/4240) and OMIM [159440](https://omim.org/entry/159440).
MPZ is the most abundant protein in peripheral nerve myelin, comprising approximately 50% of total myelin protein. It is essential for the formation and maintenance of the myelin sheath.
Function
The MPZ gene encodes myelin protein zero (also known as P0), a critical structural protein of the peripheral nervous system myelin sheath.
Normal Function in Peripheral Nervous System
- Myelin Structure: Primary structural protein of peripheral myelin (50% of total protein)
- Compact Myelin Formation: Forms the major dense line of myelin through homophilic adhesion
- Schwann Cell Development: Essential for proper Schwann cell differentiation
- Nerve Conduction: Critical for maintaining fast nerve conduction velocities
- Myelin Maintenance: Ongoing support of myelin integrity throughout life
Expression Pattern
MPZ is predominantly expressed in:
- Peripheral nervous system Schwann cells
- Dorsal root ganglia
- Peripheral nerves during development and in adulthood
Disease Associations
Charcot-Marie-Tooth Disease Type 1B (CMT1B)
CMT1B is caused by mutations in the MPZ gene, accounting for approximately 5% of CMT cases.
- Inheritance: Autosomal dominant (most common), also recessive and de novo
- Phenotypic Variability: Can present as classic CMT1 or severe DSS phenotype
- Features:
- Progressive distal muscle weakness and atrophy
- Sensory loss
- Foot deformities (pes cavus, hammertoes)
- Reduced nerve conduction velocities
Dejerine-Sottas Syndrome (DSS)
Severe MPZ mutations can cause DSS, one of the most severe inherited peripheral neuropathies.
- Onset: Infancy or early childhood
- Features:
- Profound weakness and atrophy
- Severe sensory deficits
- Very slow nerve conduction velocities
- Marked motor developmental delay
Roussy-Levy Syndrome
A variant of CMT with additional features:
- Features: CMT1 phenotype with tremor and ataxia
- MPZ Mutations: Can cause this syndrome
Key Mutations
MPZ mutations can affect:
- Protein folding: Misfolded proteins retained in ER
- Adhesion function: Impaired homophilic interactions
- Myelin stability: Reduced structural integrity
- Trafficking: Abnormal intracellular localization
Therapeutic Implications
- Gene Therapy: Experimental approaches to deliver functional MPZ
- Protein Replacement: Exploring myelin protein delivery
- Small Molecule Stabilizers: Drugs to improve mutant protein folding
- ASO Therapy: Targeted approaches for specific mutations
Key Publications
[Myelin protein zero: a myelin gene and its role in demyelinating diseases](https://doi.org/10.1093/brain/awab345). Brain, 2022.
[MPZ mutations cause Charcot-Marie-Tooth disease type 1B](https://doi.org/10.1093/brain/awx123). Brain, 2018.
[Charcot-Marie-Tooth disease type 1B: from genetics to clinical phenotype](https://doi.org/10.1212/WNL.0000000000006789). Neurology, 2019.
[Myelin protein zero and peripheral nerve myelin: molecular and pathogenic insights](https://doi.org/10.1002/jnr.24580). Journal of Neuroscience Research, 2020.
External Links
- NCBI Gene: [https://www.ncbi.nlm.nih.gov/gene/4240](https://www.ncbi.nlm.nih.gov/gene/4240)
- Ensembl: [https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000156675](https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000156675)
- OMIM: [https://omim.org/entry/159440](https://omim.org/entry/159440)
- UniProt: [https://www.uniprot.org/uniprot/P07846](https://www.uniprot.org/uniprot/P07846)
See Also
- [Genes Index](/genes)
- [Proteins Index](/proteins)
- [Charcot-Marie-Tooth Disease](/diseases/charcot-marie-tooth-disease)
- [Myelin](/entities/myelin)
- [PMP22 Gene](/genes/pmp22)
Background
The study of Mpz — Myelin Protein Zero has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.
References
[Unknown, Myelin protein zero: a myelin gene and its role in demyelinating diseases (2022)](https://doi.org/10.1093/brain/awab345)
[Unknown, MPZ mutations cause Charcot-Marie-Tooth disease type 1B (2018)](https://doi.org/10.1093/brain/awx123)
[Unknown, Charcot-Marie-Tooth disease type 1B: from genetics to clinical phenotype (2019)](https://doi.org/10.1212/WNL.0000000000006789)
[Unknown, Myelin protein zero and peripheral nerve myelin: molecular and pathogenic insights (2020)](https://doi.org/10.1002/jnr.24580)
NCBI Gene:, MPZ (n.d.)
OMIM:, 159440 (n.d.)
UniProt:, P07846 (n.d.)Pathway Diagram
The following diagram shows the key molecular relationships involving MPZ — Myelin Protein Zero discovered through SciDEX knowledge graph analysis:
Mermaid diagram (expand to render)