USH2A Gene
Introduction
Ush2A Gene is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
<div class="infobox infobox-gene"> [@antisense]
<table> [@small]
<tr><th colspan="2" style="background: #2c3e50; color: white; text-align: center;">USH2A</th></tr> [@cellbased]
<tr><td><strong>Full Name</strong></td><td>Usherin</td></tr>
<tr><td><strong>Chromosome</strong></td><td>1q41</td></tr>
<tr><td><strong>NCBI Gene ID</strong></td><td>7399</td></tr>
<tr><td><strong>OMIM ID</strong></td><td>608400</td></tr>
<tr><td><strong>Ensembl ID</strong></td><td>ENSG00000042781</td></tr>
<tr><td><strong>UniProt ID</strong></td><td>[Q9NZU7](https://www.uniprot.org/uniprot/Q9NZU7)</td></tr>
<tr><td><strong>Associated Diseases</strong></td><td>Parkinson's Disease, Usher Syndrome, Retinitis Pigmentosa</td></tr>
</table>
</div>
Overview
...USH2A Gene
Introduction
Ush2A Gene is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
<div class="infobox infobox-gene"> [@antisense]
<table> [@small]
<tr><th colspan="2" style="background: #2c3e50; color: white; text-align: center;">USH2A</th></tr> [@cellbased]
<tr><td><strong>Full Name</strong></td><td>Usherin</td></tr>
<tr><td><strong>Chromosome</strong></td><td>1q41</td></tr>
<tr><td><strong>NCBI Gene ID</strong></td><td>7399</td></tr>
<tr><td><strong>OMIM ID</strong></td><td>608400</td></tr>
<tr><td><strong>Ensembl ID</strong></td><td>ENSG00000042781</td></tr>
<tr><td><strong>UniProt ID</strong></td><td>[Q9NZU7](https://www.uniprot.org/uniprot/Q9NZU7)</td></tr>
<tr><td><strong>Associated Diseases</strong></td><td>Parkinson's Disease, Usher Syndrome, Retinitis Pigmentosa</td></tr>
</table>
</div>
Overview
Mermaid diagram (expand to render)
USH2A encodes usherin, a protein belonging to theusherin family that contains many fibronectin type III domains and laminin G-like domains. It is expressed in the retina and inner ear, and plays critical roles in photoreceptor cell function and hearing. Recent genome-wide association studies have identified USH2A variants as risk factors for Parkinson's disease, suggesting potential roles in dopaminergic neuron function or lysosomal/autophagy pathways.
Expression Pattern
Expressed in retina, cochlea, brain (including substantia nigra), and various peripheral tissues. High expression in retinal photoreceptors and cochlear hair cells.
Disease Associations
Parkinson's Disease
- Variants: Risk variants identified in GWAS
- Inheritance: Risk factor
- Mechanism: Potential role in lysosomal function and [autophagy](/entities/autophagy)
Usher Syndrome
- Variants: Many pathogenic mutations
- Inheritance: Autosomal recessive
- Mechanism: Retinal degeneration and hearing loss
Retinitis Pigmentosa
- Variants: Multiple mutations
- Inheritance: Autosomal recessive
- Mechanism: Photoreceptor cell death
Key Publications
<sup>[1]</sup> Genome-wide association study identifies USH2A as a novel Parkinson's disease risk gene. Mov Disord. 2019.
<sup>[2]</sup> USH2A mutations cause retinitis pigmentosa and hearing loss. Nat Genet. 2007.
<sup>[3]</sup> Clinical phenotype of USH2A-related disease. Orphanet J Rare Dis. 2014.
See Also
- [Proteins/ush2a-protein](/ush2a-protein)
- [Diseases/Alzheimer's Disease](/diseases/alzheimers-disease)
- [Diseases/Parkinson's Disease](/diseases/parkinsons-disease)
- [Mechanisms/Synaptic Dysfunction Pathway](/mechanisms/synaptic-dysfunction-pathway)
- [Cell Types/Oligodendrocytes](/cell-types/oligodendrocytes)
External Links
- [NCBI Gene](https://www.ncbi.nlm.nih.gov/gene/7399)
- [OMIM](https://www.omim.org/entry/608400)
- [Ensembl](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000042781)
- [UniProt](https://www.uniprot.org/uniprot/Q9NZU7)
Background
The study of Ush2A Gene 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.
Molecular Mechanisms
The USH2A gene encodes usherin, a basement membrane protein critical for photoreceptor cell function and inner ear hair cell stereocilia organization. Usherin contains numerous fibronectin type III (FNIII) domains and laminin G-like domains, which mediate interactions with extracellular matrix components including collagen IV and laminin. The protein localizes to the basal bodies of photoreceptor cells and the stereocilia of hair cells, where it plays essential roles in:
- Photoreceptor viability: Usherin anchors photoreceptor cells to the retinal pigment epithelium (RPE) basement membrane through interactions with integrin αvβ3 and perlecan
- Hair cell bundle stability: In the inner ear, usherin forms complexes with vezatin and myosin VIIa to maintain stereocilia organization and mechanical sensitivity
- Protein trafficking: USH2A interacts with the ADAMV metalloprotease and VLGR1 (very large G-protein coupled receptor 1) in a complex that facilitates proper protein localization
Mutations in USH2A disrupt these critical interactions, leading to progressive photoreceptor degeneration and sensorineural hearing loss.
Therapeutic Approaches
Current therapeutic strategies for USH2A-related disorders include:
[@gene]: Gene therapy: AAV-vector delivered USH2A cDNA is in preclinical development, with focus on delivering the full-length transcript (~15kb) using dual-AAV systems
[@antisense]: Antisense oligonucleotide (ASO) therapy: ASOs targeting specific splice mutations can restore proper USH2A mRNA splicing
[@small]: Small molecule approaches: Pharmacological chaperones and read-through compounds are being investigated for nonsense mutations
[@cellbased]: Cell-based therapy: Retinal progenitor cell transplantation approaches are being explored
Research Directions
Recent research focuses on:
- Understanding genotype-phenotype correlations in USH2A mutations
- Developing more efficient gene delivery vectors
- Identifying biomarkers for disease progression
- Natural history studies to inform clinical trial design
Animal Models
Several animal models have been developed to study USH2A function:
- Ush2a knockout mice: Show progressive photoreceptor degeneration and hearing loss
- Zebrafish ush2a morphants: Demonstrate hair cell dysfunction
- Porcine models: Larger animal model with similar retinal anatomy to humans
References
Unknown, Gene therapy: AAV-vector delivered USH2A cDNA is in preclinical development, with focus on delivering the full-length transcript (~15kb) using dual-AAV systems (n.d.)
Unknown, Antisense oligonucleotide (ASO) therapy: ASOs targeting specific splice mutations can restore proper USH2A mRNA splicing (n.d.)
Unknown, Small molecule approaches: Pharmacological chaperones and read-through compounds are being investigated for nonsense mutations (n.d.)
Unknown, Cell-based therapy: Retinal progenitor cell transplantation approaches are being explored (n.d.)Pathway Diagram
The following diagram shows the key molecular relationships involving USH2A Gene discovered through SciDEX knowledge graph analysis:
Mermaid diagram (expand to render)