| EMD — Emerin | |
|---|---|
| Symbol | EMD |
| Full Name | Emerin |
| Chromosome | Xq28 |
| NCBI Gene | 2010 |
| Ensembl | ENSG00000102119 |
| OMIM | 300384 |
| UniProt | P50402 |
| Diseases | Emery-Dreifuss Muscular Dystrophy, X-linked Dilated Cardiomyopathy |
| Expression | Skeletal Muscle, Cardiac Muscle, Nuclear Envelope |
| Key Mutations | |
| c.271C>T (p.Arg91*) deletion exons 1-6 |
|
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 (EDMD), an X-linked disorder characterized by contractures, muscle weakness, and cardiac involvement. The gene is catalogued as NCBI Gene ID 2010 and OMIM 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.
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.
Emerin performs several essential cellular functions:
Nuclear structure maintenance: Emerin interacts with nuclear lamins (particularly lamin A/C) 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].
Although most studied in muscle, emerin is expressed in various brain regions:
Expression data is available from the Allen Human Brain Atlas.
EMD mutations are primarily associated with:
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:
Over 200 pathogenic variants have been identified in EMD, including:
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].
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:
Emerin contains:
The critical interaction between emerin and lamin A/C forms the basis of nuclear envelope stability. Mutations that disrupt this interaction lead to:
Emerging gene therapy approaches for X-linked EDMD include: