HNRNPA1 Gene
<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">HNRNPA1 — Heterogeneous Nuclear Ribonucleoprotein A1</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>HNRNPA1</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Heterogeneous Nuclear Ribonucleoprotein A1</td>
</tr>
<tr>
<td class="label">Chromosome</td>
<td>12q13.13</td>
</tr>
<tr>
<td class="label">NCBI Gene</td>
<td><a href="https://www.ncbi.nlm.nih.gov/gene/3178" target="_blank">3178</a></td>
</tr>
<tr>
<td class="label">Ensembl</td>
<td><a href="https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000166086" target="_blank">ENSG00000166086</a></td>
</tr>
<tr>
<td class="label">OMIM</td>
<td><a href="https://omim.org/entry/164017" target="_blank">164017</a></td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/P09651" target="_blank">P09651</a></td>
</tr>
<tr>
<td class="label">Diseases</td>
<td>[Amyotrophic Lateral Sclerosis](/diseases/als), [Inclusion Body Myopathy](/diseases/inclusion-body-myopathy), [Frontotemporal Dementia](/diseases/ftd)</td>
</tr>
<tr>
<td class="label">Expression</td>
<td>Ubiquitous, High in brain, spinal cord, muscle</td>
</tr>
<tr>
<th class="infobox-subheader" colspan="2">Key Mutations</th>
</tr>
<tr>
<td colspan="2" style="font-size:0.85em">Asp262Val<br>Gly295Ser<br>Gly298Arg<br>Asp314Val<br>Phe316Leu</td>
</tr>
</table>
...HNRNPA1 Gene
<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">HNRNPA1 — Heterogeneous Nuclear Ribonucleoprotein A1</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>HNRNPA1</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Heterogeneous Nuclear Ribonucleoprotein A1</td>
</tr>
<tr>
<td class="label">Chromosome</td>
<td>12q13.13</td>
</tr>
<tr>
<td class="label">NCBI Gene</td>
<td><a href="https://www.ncbi.nlm.nih.gov/gene/3178" target="_blank">3178</a></td>
</tr>
<tr>
<td class="label">Ensembl</td>
<td><a href="https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000166086" target="_blank">ENSG00000166086</a></td>
</tr>
<tr>
<td class="label">OMIM</td>
<td><a href="https://omim.org/entry/164017" target="_blank">164017</a></td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/P09651" target="_blank">P09651</a></td>
</tr>
<tr>
<td class="label">Diseases</td>
<td>[Amyotrophic Lateral Sclerosis](/diseases/als), [Inclusion Body Myopathy](/diseases/inclusion-body-myopathy), [Frontotemporal Dementia](/diseases/ftd)</td>
</tr>
<tr>
<td class="label">Expression</td>
<td>Ubiquitous, High in brain, spinal cord, muscle</td>
</tr>
<tr>
<th class="infobox-subheader" colspan="2">Key Mutations</th>
</tr>
<tr>
<td colspan="2" style="font-size:0.85em">Asp262Val<br>Gly295Ser<br>Gly298Arg<br>Asp314Val<br>Phe316Leu</td>
</tr>
</table>
HNRNPA1 — Heterogeneous Nuclear Ribonucleoprotein A1
Pathway Diagram
Mermaid diagram (expand to render)
Introduction
Hnrnpa1 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.
Overview
HNRNPA1 (Heterogeneous Nuclear Ribonucleoprotein A1) is a gene encoding an RNA-binding protein that plays critical roles in RNA processing, splicing, and transport. Pathogenic mutations in HNRNPA1 cause familial amyotrophic lateral sclerosis (ALS), inclusion body myopathy (IBM), and frontotemporal dementia (FTD)[@kim2013].
Function
HNRNPA1 is a member of the hnRNP A/B family of RNA-binding proteins with multiple cellular functions:
RNA Processing
- Pre-mRNA splicing: HNRNPA1 is a core component of the spliceosome
- Alternative splicing: Regulates inclusion/exclusion of exons
- RNA stability: Binds to AU-rich elements to regulate mRNA half-life
RNA Transport
- Nuclear export: Facilitates export of processed mRNAs
- Localization: Directs specific mRNAs to subcellular compartments
Stress Response
- Stress granules: Aggregates into stress granules under cellular stress
- Translation regulation: Represses translation during stress
Disease Associations
Amyotrophic Lateral Sclerosis (ALS)
HNRNPA1 mutations cause autosomal dominant ALS, typically with combined upper and lower motor neuron involvement. The disease mechanism involves:
RNA dysregulation: Altered splicing of essential neuronal transcripts
Stress granule pathology: Aberrant stress granule formation
Toxic gain-of-function: Formation of RNA foci that sequester essential proteinsInclusion Body Myopathy (IBM)
Some HNRNPA1 mutations cause autosomal dominant inclusion body myopathy, characterized by:
- Progressive muscle weakness
- Rimmed vacuoles in muscle fibers
- Often associated with FTD (ALS/IBM/FTD spectrum)
Frontotemporal Dementia (FTD)
HNRNPA1 mutations can cause FTD with or without motor neuron disease, sharing pathological features with ALS including [TDP-43](/proteins/tdp-43) pathology[@alternate2013].
Mechanisms of Neurodegeneration
| Mechanism | Description |
|-----------|-------------|
| RNA splicing defects | Mis-splicing of transcripts essential for neuronal survival |
| Stress granule accumulation | Persistent granules that disrupt translation |
| Nuclear import defects | Impaired nuclear-cytoplasmic transport |
| Protein aggregation | Formation of insoluble inclusions |
Therapeutic Targeting
Therapeutic strategies for HNRNPA1-related disorders include:
- ASO therapy: Antisense oligonucleotides to reduce mutant HNRNPA1 expression
- Small molecule modulators: Compounds that normalize splicing
- Gene therapy: AAV-delivered HNRNPA1 or splicing modifiers
See Also
- [Amyotrophic Lateral Sclerosis](/diseases/als)
- [Frontotemporal Dementia](/diseases/ftd)
- [RNA Metabolism Dysregulation](/mechanisms/rna-metabolism-dysregulation)
- [Stress Granules](/mechanisms/stress-granules)
- [TDP-43 Pathology](/tdp-43-pathology-in-frontotemporal-dementia)
- [HNRNPA2B1](/proteins/hnrnp-a2b1-protein)
External Links
- [NCBI Gene: HNNRPA1](https://www.ncbi.nlm.nih.gov/gene/3178)
- [UniProt: HNRNPA1](https://www.uniprot.org/uniprot/P09651)
- [Ensembl: HNRNPA1](https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000166086)
Animal Models
- hnRNPA1 Knock-in Mice: Recapitulate ALS phenotype with motor neuron degeneration
- Drosophila Models: Show locomotion deficits and reduced lifespan
- Zebrafish Models: Demonstrate motor axon guidance defects
Therapeutic Approaches
Gene Therapy
Allele-Specific siRNA: Targeting mutant HNNRPA1 transcripts
CRISPR Editing: Correcting pathogenic mutations
AAV Delivery: Wild-type HNRNPA1 or splicing modifiersSmall Molecule Strategies
- Splicing Modifiers: Antisense oligonucleotides to normalize splicing
- Protein Stabilizers: Compounds that stabilize the native protein
- Aggregation Inhibitors: Preventing toxic oligomer formation
Research Directions
Current areas of investigation include:
- Understanding the mechanistic link between splicing dysfunction and motor neuron death
- Developing biomarkers for HNRNPA1-related disease
- Screening for small molecules that restore normal splicing patterns
- Investigating the interplay between HNRNPA1 and other ALS/FTD proteins
Background
The study of Hnrnpa1 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.
References
[Kim HJ, Kim NC, Wang YD, et al, Mutations in the prion-like domains of hnRNPA1 and hnRNPA2B1 cause familial amyotrophic lateral sclerosis (2013)](https://pubmed.ncbi.nlm.nih.gov/24060820/)
[Unknown, Alternate splicing factor mutations in ALS/FTD (2013)](https://pubmed.ncbi.nlm.nih.gov/24093116/)Pathway Diagram
The following diagram shows the key molecular relationships involving HNRNPA1 Gene discovered through SciDEX knowledge graph analysis:
Mermaid diagram (expand to render)