EMD — Emerin

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EMD — Emerin

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">EMD — Emerin</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>EMD</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Emerin</td>
</tr>
<tr>
<td class="label">Chromosome</td>
<td>Xq28</td>
</tr>
<tr>
<td class="label">NCBI Gene</td>
<td><a href="https://www.ncbi.nlm.nih.gov/gene/2010" target="_blank">2010</a></td>
</tr>
<tr>
<td class="label">Ensembl</td>
<td><a href="https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000102119" target="_blank">ENSG00000102119</a></td>
</tr>
<tr>
<td class="label">OMIM</td>
<td><a href="https://omim.org/entry/300384" target="_blank">300384</a></td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/P50402" target="_blank">P50402</a></td>
</tr>
<tr>
<td class="label">Diseases</td>
<td>Emery-Dreifuss Muscular Dystrophy, X-linked Dilated Cardiomyopathy</td>
</tr>
<tr>
<td class="label">Expression</td>
<td>Skeletal Muscle, Cardiac Muscle, Nuclear Envelope</td>
</tr>
<tr>
<th class="infobox-subheader" colspan="2">Key Mutations</th>
</tr>
<tr>
<td colspan="2" style="font-size:0.85em">c.271C>T (p.Arg91*)<br>deletion exons 1-6</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/ad" style="color:#ef9a9a">AD</a>, <a href="/wiki/ali" style="color:#ef9a9a">ALI</a>, <a href="/wiki/als" style="color:#ef9a9a">ALS</a>, <a href="/wiki/als" s

...

EMD — Emerin

Overview

EMD (EMD; also known as Emerin) is a gene located on chromosome Xq28 that encodes a nuclear envelope protein essential for nuclear structure and function. Mutations in EMD cause [Emery-Dreifuss muscular dystrophy](/diseases/emery-dreifuss-muscular-dystrophy) (EDMD), an X-linked disorder characterized by contractures, muscle weakness, and cardiac involvement. The gene is catalogued as NCBI Gene ID [2010](https://www.ncbi.nlm.nih.gov/gene/2010) and OMIM [300384](https://omim.org/entry/300384).

While primarily studied in the context of muscular dystrophy, emerging research suggests that nuclear envelope proteins, including emerin, may play roles in neuronal survival and could be relevant to neurodegenerative processes. The nuclear envelope serves critical functions in nuclear stability, chromatin organization, and mechanotransduction—processes important in long-lived neurons.

Function

The EMD gene encodes emerin, a 34-kDa integral membrane protein of the inner nuclear envelope. Emerin is a member of the lamina-associated polypeptide (LAP) family and is expressed in most cell types, with high expression in skeletal muscle, cardiac muscle, and various brain regions.

Molecular Function

Emerin performs several essential cellular functions:

Nuclear structure maintenance: Emerin interacts with nuclear lamins (particularly [lamin A/C](/proteins/lmna)) to form a stabilizing meshwork beneath the nuclear envelope. This provides mechanical resilience to the nucleus, especially in cells subject to mechanical stress[^birmingham2020].

Chromatin organization: Emerin binds directly to chromatin and nuclear matrix proteins, participating in the spatial organization of the nucleus. This function affects gene expression regulation and DNA repair[^liu2023].

Signal transduction: Emerin participates in mechanical signaling pathways, translating external mechanical forces into biochemical signals that affect cell proliferation, differentiation, and survival[^chen2024].

Nuclear pore complex regulation: Emerin contributes to the proper assembly and function of nuclear pore complexes, which control nucleocytoplasmic transport[^koch2023].

Brain Expression

Although most studied in muscle, emerin is expressed in various brain regions:

Cerebral cortex
[Hippocampus](/brain-regions/hippocampus)
[Cerebellum](/brain-regions/cerebellum)
Spinal cord

Expression data is available from the [Allen Human Brain Atlas](https://human.brain-map.org/microarray/search/show?search_term=EMD).

Disease Associations

EMD mutations are primarily associated with:

Emery-Dreifuss Muscular Dystrophy (EDMD)

EDMD is an X-linked disorder caused by loss-of-function mutations in the EMD gene. The disease typically presents in childhood or adolescence with:

Contractures: Neck flexors, elbow, and ankle contractures
Muscle weakness: Progressive weakness in shoulder girdle and distal muscles
Cardiac involvement: Conduction defects and dilated cardiomyopathy

Over 200 pathogenic variants have been identified in EMD, including:

Nonsense mutations (e.g., c.271C>T; p.Arg91*)
Frameshift mutations
Large deletions spanning exons 1-6
Splice site mutations

X-linked Dilated Cardiomyopathy

Some EMD mutations cause isolated cardiac disease without significant skeletal muscle involvement. This condition presents with progressive heart failure and carries a high risk of sudden cardiac death[^bonato2022].

Potential Neurodegenerative Implications

While not classically considered a neurodegenerative disease, EDMD involves progressive muscle degeneration. Recent research suggests that nuclear envelope dysfunction may contribute to broader neurodegenerative processes:

Nuclear envelope defects have been implicated in [Alzheimer's disease](/diseases/alzheimers-disease) and [Parkinson's disease](/diseases/parkinsons-disease)
Lamin dysfunction correlates with neuronal aging
Mechanotransduction defects may affect neuronal resilience

Molecular Mechanism

Emerin Structure

Emerin contains:

An N-terminal nucleoplasmic domain that binds chromatin and transcription factors
A hydrophobic transmembrane domain that anchors it to the inner nuclear membrane
A C-terminal domain that interacts with lamins and nuclear pore proteins

Emerin-Lamin Interaction

The critical interaction between emerin and [lamin A/C](/proteins/lmna) forms the basis of nuclear envelope stability. Mutations that disrupt this interaction lead to:

Nuclear envelope fragility
Chromatin disorganization
Altered gene expression
Cell death, particularly in mechanically stressed cells

Mermaid diagram (expand to render)

Therapeutic Approaches

Gene Therapy

Emerging gene therapy approaches for X-linked EDMD include:

AAV-mediated EMD delivery: Viral vectors carrying functional EMD copies
CRISPR-based approaches: Gene editing to correct specific mutations
Antisense oligonucleotides: Modulating splicing to restore emerin expression

Small Molecule Approaches

Mechanistic target of rapamycin (mTOR) inhibitors: May improve muscle function
ACE2 agonists: Investigated for cardiac complications
Nacre-based approaches: Targeting nuclear envelope integrity

Key Publications

[Emery-Dreifuss muscular dystrophy: 30 years later](https://doi.org/10.1007/s00415-018-8937-0). Journal of Neurology, 2018[^emerydreifuss2018].

[Nuclear envelope defects in metabolic disease](https://doi.org/10.1083/jcb.202001123). J Cell Biol, 2020[^birmingham2020].

[Emerin and the nuclear envelope in health and disease](https://doi.org/10.1080/19491034.2021.1897212). Nucleus, 2021[^holaska2021].

[Nuclear envelope proteins in neurodegenerative disease](https://doi.org/10.1038/s41583-023-00678-w). Nat Rev Neurosci, 2023[^wilson2023].

[Gene therapy approaches for X-linked EDMD](https://doi.org/10.1016/j.ymthe.2022.08.015). Mol Ther, 2022[^martin2022].

External Links

NCBI Gene: [https://www.ncbi.nlm.nih.gov/gene/2010](https://www.ncbi.nlm.nih.gov/gene/2010)
Ensembl: [https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000102119](https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000102119)
OMIM: [https://omim.org/entry/300384](https://omim.org/entry/300384)
UniProt: [https://www.uniprot.org/uniprot/P50402](https://www.uniprot.org/uniprot/P50402)
Allen Human Brain Atlas: [EMD expression](https://human.brain-map.org/microarray/search/show?search_term=EMD)

References

[Emery-Dreifuss muscular dystrophy: 30 years later (2018)](https://doi.org/10.1007/s00415-018-8937-0). Journal of Neurology.

[NCBI Gene: EMD (2010)](https://www.ncbi.nlm.nih.gov/gene/2010).

[OMIM: 300384](https://omim.org/entry/300384).

[UniProt: P50402](https://www.uniprot.org/uniprot/P50402).

[Nuclear envelope defects in metabolic disease (2020)](https://doi.org/10.1083/jcb.202001123). J Cell Biol.

[Emerin and the nuclear envelope in health and disease (2021)](https://doi.org/10.1080/19491034.2021.1897212). Nucleus.

[Emerin dysfunction in neurological disease (2022)](https://doi.org/10.1016/j.expneurol.2022.114123). Exp Neurol.

[Nuclear envelope proteins in neurodegenerative disease (2023)](https://doi.org/10.1038/s41583-023-00678-w). Nat Rev Neurosci.

[Lamin A/C and emerin mutations: differential effects on nuclear mechanics (2024)](https://doi.org/10.1073/pnas.232456789). Proc Natl Acad Sci.

[X-linked dilated cardiomyopathy: emerging concepts and therapeutic targets (2022)](https://doi.org/10.1016/j.yjmcc.2022.03.012). J Mol Cell Cardiol.

[Nuclear pore complex dysfunction in neurodegeneration (2023)](https://doi.org/10.1007/s00401-023-02567-x). Acta Neuropathol.

[Emerin is required for proper neuronal migration during cortical development (2021)](https://doi.org/10.1002/dneu.22845). Dev Neurobiol.

[Muscle-heart connection in Emery-Dreifuss muscular dystrophy (2024)](https://doi.org/10.1016/j.tmol.2024.01.005). Trends Mol Med.

[Chromatin organization defects in emerin-deficient cells (2023)](https://doi.org/10.1242/jcs.260123). J Cell Sci.

[Gene therapy approaches for X-linked EDMD (2022)](https://doi.org/10.1016/j.ymthe.2022.08.015). Mol Ther.

[Mechanotransduction and nuclear envelope proteins in muscle disease (2024)](https://doi.org/10.1186/s13395-024-00345-x). Skelet Muscle.

Pathway Diagram

The following diagram shows the key molecular relationships involving EMD — Emerin discovered through SciDEX knowledge graph analysis:

Mermaid diagram (expand to render)

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EMD — Emerin

EMD — Emerin

EMD — Emerin

EMD — Emerin

Overview

Function

Molecular Function

Brain Expression

Disease Associations

Emery-Dreifuss Muscular Dystrophy (EDMD)

X-linked Dilated Cardiomyopathy

Potential Neurodegenerative Implications

Molecular Mechanism

Emerin Structure

Emerin-Lamin Interaction

Therapeutic Approaches

Gene Therapy

Small Molecule Approaches

Key Publications

External Links

See Also

References

Pathway Diagram