HNRNPA2B1 - Heterogeneous Nuclear Ribonucleoprotein A2/B1

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HNRNPA2B1 - Heterogeneous Nuclear Ribonucleoprotein A2/B1

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HNRNPA2B1 - Heterogeneous Nuclear Ribonucleoprotein A2/B1

Pathway Diagram

```mermaid
flowchart TD
HNRNPA2B1["HNRNPA2B1 RNA-binding protein Ribonucleoprotein"]

%% RNA Processing & Associated Proteins
HNRNPA1["HNRNPA1 RNA-binding protein"]
IGF2BP1["IGF2BP1 RNA-binding protein"]
VALOSIN["VCP/VALOSIN Protein processing"]

%% Signaling Pathways
NOTCH1["NOTCH1 Transcription factor"]
NotchPath["Notch Signaling Pathway"]
CSNK2A1["CSNK2A1 Casein kinase"]
EpiPath["Epigenetic Regulation"]

%% Neurodegenerative Diseases
ALS["Amyotrophic Lateral Sclerosis (ALS)"]
FTD["Frontotemporal Dementia"]
ALZ["Alzheimer's Disease"]
MS["Multiple Sclerosis"]
Dementia["Dementia General"]
NeuroDegeneration["Neurodegeneration Process"]

%% Inflammatory Process
Inflammation["Neuroinflammation Process"]

%% Connections
HNRNPA2B1 -->|"associates with"| HNRNPA1
HNRNPA2B1 -->|"interacts with"| IGF2BP1
HNRNPA2B1 -->|"associates with"| VALOSIN

HNRNPA2B1 -->|"activates"| CSNK2A1
HNRNPA2B1 -->|"activates"| NOTCH1
HNRNPA2B1 -->|"activates"| NotchPath
HNRNPA2B1 -->|"inhibits"| EpiPath

HNRNPA2B1 -->|"activates"| ALS
HNRNPA2B1 -->|"activates"| ALZ
HNRNPA2B1 -->|"associated with"| FTD
HNRNPA2B1 -->|"activates"| MS
HNRNPA2B1 -->|"associated with"| Dementia
HNRNPA2B1 -->|"activates"| NeuroDegeneration

HNRNPA2B1 -->|"regulates"| Inflammation
Inflammation -->|"contributes to"|

...

HNRNPA2B1 - Heterogeneous Nuclear Ribonucleoprotein A2/B1

Pathway Diagram

Mermaid diagram (expand to render)

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">HNRNP A2B1</th>
</tr>
<tr> [@liu2022]
<td class="label">Gene Symbol</td> [@martinezcontreras2003]
<td>HNRNPA2B1</td> [@shenkman2020]
</tr> [@glinka2020]
<tr> [@kim2021]
<td class="label">Full Name</td> [@alarcon2015]
<td>Heterogeneous Nuclear Ribonucleoprotein A2/B1</td> [@liu2019]
</tr> [@benatar2020]
<tr>
<td class="label">Chromosomal Location</td>
<td>7p15.2</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>3181</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000122566</td>
</tr>
<tr>
<td class="label">OMIM ID</td>
<td>600124</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>P22626</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td>ALS, FTD, Multisystem Proteinopathy</td>
</tr>
<tr>
<td class="label">Protein Family</td>
<td>HnRNP A/B family</td>
</tr>
</table>

HNRNPA2B1 (Heterogeneous Nuclear Ribonucleoprotein A2/B1)

Introduction

Hnrnpa2B1 Heterogeneous Nuclear Ribonucleoprotein A2 B1 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

HNRNPA2B1 encodes a member of the heterogeneous nuclear ribonucleoprotein family with essential roles in RNA processing, stress granule formation, and RNA localization[@beyer1977]. HNRNPA2B1 is one of the most abundant nuclear
RNA-binding proteins and plays critical roles in alternative splicing, mRNA stability, and translational regulation[@mayeda1992]. Like HNRNPA1, pathogenic mutations in HNRNPA2B1
cause familial ALS and multisystem proteinopathy (MSP), demonstrating the critical importance of hnRNP proteins in motor neuron survival[@kim2013].

The protein contains two RNA recognition motifs (RRMs) and a glycine-rich low-complexity domain that undergoes liquid-liquid phase separation, enabling stress granule formation and
pathological aggregation in neurodegenerative disease[@molliex2015]. HNRNPA2B1 is also recognized as an N6-methyladenosine (m6A) reader, participating in post-transcriptional RNA regulation[@liu2022].

Function

RNA Processing

HNRNPA2B1 participates in multiple aspects of RNA metabolism:

Alternative splicing: Regulation of splice site selection through binding to pre-mRNA[@martinezcontreras2003]

mRNA stability: Binding to AU-rich elements in target mRNAs to regulate degradation[@shenkman2020]

RNA transport: Localizing specific mRNAs to subcellular compartments including neuronal processes[@glinka2020]

Translation: Modulating translational efficiency through interaction with translation initiation factors[@kim2021]

miRNA processing: Involvement in microRNA biogenesis[@alarcon2015]

Stress Granules

The glycine-rich low-complexity domain enables HNRNPA2B1 to undergo liquid-liquid phase separation (LLPS):

Formation of stress granules under cellular stress conditions
Dynamic exchange between membraneless organelles and cytoplasmic pool
Pathological aggregation when prion-like domains mutate
Sequestration of translation machinery and signaling proteins

N6-methyladenosine (m6A) Reading

HNRNPA2B1 functions as an m6A reader:

Recognizes m6A-modified mRNA transcripts
Regulates RNA splicing and nuclear export
Influences mRNA stability and translation
Dysregulation affects neuronal function and survival

Protein Structure

Domain Organization

HNRNPA2B1 contains several functional domains:

RNA Recognition Motif 1 (RRM1): N-terminal RRM that binds single-stranded RNA
**RNA Recognition Motif 2 (RRM2): C-terminal RRM for RNA binding specificity
Glycine-rich low-complexity domain: Prion-like domain enabling phase separation
Nuclear localization signal (NLS): Targets protein to the nucleus

Post-translational Modifications

The protein undergoes various modifications:

Phosphorylation: Affects localization and RNA binding
Methylation: Influences protein-protein interactions
Sumoylation: Regulates stress granule dynamics

Expression Patterns

Tissue Distribution

HNRNPA2B1 is ubiquitously expressed with high levels in:

Brain (particularly [cortex](/brain-regions/cortex), [hippocampus](/brain-regions/hippocampus), and motor neurons)
Skeletal muscle
Heart
Lung
Testis

Cellular Localization

Predominantly nuclear (speckles and nucleoplasm)
Cytoplasmic localization during active RNA transport
Stress granule localization under cellular stress

Disease Associations

Amyotrophic Lateral Sclerosis (ALS)

HNRNPA2B1 mutations cause familial ALS with typical clinical features:

Progressive muscle weakness and atrophy
Fasciculations and muscle cramps
Bulbar involvement (dysarthria, dysphagia)
Respiratory involvement in later stages
Typical age of onset in 40s-60s[@kim2013]

The D262V mutation in the prion-like domain was the first identified pathogenic variant causing ALS[@liu2019].

Multisystem Proteinopathy (MSP)

The HNRNPA2B1-related disorder presents with a triad of conditions:

Inclusion body myopathy: Progressive muscle weakness, typically beginning in adulthood
Paget disease of bone: Increased bone turnover with focal lesions
Frontotemporal Dementia: Cognitive and behavioral changes

This rare autosomal dominant disorder demonstrates the link between muscle, bone, and neuronal pathology[@benatar2020].

Frontotemporal Dementia (FTD)

While primarily associated with ALS, HNRNPA2B1 mutations can cause FTD without Motor Neuron Disease:

Behavioral variant FTD (bvFTD)
Language variant (primary progressive aphasia)
Progressive Supranuclear Palsy phenotype

Pathogenesis

Prion-like Propagation

HNRNPA2B1 aggregates in a prion-like manner:

Mutant protein misfolds and forms oligomers

Oligomers seed aggregation of wild-type protein

Aggregates spread through neural networks

Progressive loss of neuronal function

Stress Granule Dysregulation

Pathogenic mutations disrupt stress granule dynamics:

Excessive phase separation
Impaired disassembly of stress granules
Sequestration of essential cellular proteins
Disruption of RNA metabolism

RNA Metabolism Defects

ALS-associated mutations cause:

Altered splicing of survival motor neuron (SMN) transcripts
Dysregulated translation of neuronal proteins
Impaired RNA transport to synaptic terminals

Animal Models

Drosophila Models

Knock-in and overexpression models recapitulate key features
Motor dysfunction and reduced lifespan observed
Stress granule accumulation in [neurons](/entities/neurons)

Mouse Models

Transgenic mice with mutant HNRNPA2B1 show:
Motor neuron degeneration
Muscle denervation
Gliosis in spinal cord
Behavioral deficits

Therapeutic Approaches

Gene Therapy Strategies

Antisense oligonucleotides (ASOs): Reduce mutant allele expression
CRISPR-based approaches: Correct mutations or allele-specific silencing
AAV delivery: Target CNS motor neurons

Small Molecule Approaches

Phase separation modulators: Normalize LLPS dynamics
Protein aggregation inhibitors: Prevent toxic oligomer formation
RNA metabolism modulators: Restore proper RNA processing

Biomarkers

Elevated HNRNPA2B1 in cerebrospinal fluid of ALS patients
Potential for disease progression monitoring
Utility in clinical trial enrollment

External Links

NCBI Gene: [HNRNPA2B1](https://www.ncbi.nlm.nih.gov/gene/3181)
Ensembl: [HNRNPA2B1](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000122566)
UniProt: [P22626](https://www.uniprot.org/uniprotkb/P22626)
OMIM: [HNRNPA2B1](https://www.omim.org/entry/600124)
ALS Genetics: [ALSGene](https://alsgene.org/)

Brain Atlas Resources

[Allen Brain Atlas](https://brain-map.org)
[Allen Human Brain Atlas: HNRNPA2B1 search](https://human.brain-map.org/microarray/search/show?search_term=HNRNPA2B1)
[Allen Mouse Brain Atlas: HNRNPA2B1 search](https://mouse.brain-map.org/search/index.html?query=HNRNPA2B1)
[Allen Cell Type Atlas](https://portal.brain-map.org/atlases-and-data/rnaseq)
[BrainSpan Developmental Transcriptome](https://www.brainspan.org)

Background

The study of Hnrnpa2B1 Heterogeneous Nuclear Ribonucleoprotein A2 B1 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

[Beyer AL, Christensen ME, Walker BW, LeStourgeon WM, "Identification and characterization of the packaging proteins of core 40S hnRNP particles." Cell (1977)](https://doi.org/10.1016/0092-8674(77)

[Mayeda A, Krainer AR, "Regulation of alternative pre-mRNA splicing by hnRNP A1/A2B1." Cell (1992)](https://doi.org/10.1016/0092-8674(92)

[Kim HJ, Kim NC, Wang YD, et al, "Mutations in prion-like domains in hnRNPA1 and hnRNPA2B1 cause amyotrophic lateral sclerosis and Frontotemporal Dementia." Nature (2013)](https://doi.org/10.1038/nature11922)

[Molliex A, Taylor J, Fare CM, et al, "Phase separation by low complexity domains promotes stress granule assembly and drives pathological fibrillization." Cell (2015)](https://doi.org/10.1016/j.cell.2015.09.015)

[Liu N, Zhou KI, Zhang W, et al, "Direct detection of N6-methyladenosine in RNA by digital enzyme-free sequencing." Nat Biotechnol (2022)](https://doi.org/10.1038/s41587-022-01410-2)

[Martinez-Contreras R, Cloutier P, Shkreta L, et al, "hnRNP proteins and splicing." Biopolymers (2003)](https://doi.org/10.1002/bip.10361)

[Shenkman M, Brill M, Dromi M, et al, "HNRNPA2B1 controls diet-induced obesity via regulation of lipid metabolism in adipose tissue." Mol Metab (2020)](https://doi.org/10.1016/j.molmet.2020.101077)

[Glinka M, Herrmann R, Hausmann M, et al, "HNRNPA2B1 localizes to dendritic RNA granules." J Cell Sci (2020)](https://doi.org/10.1242/jcs.249342)

[Kim J, Park R, Yoo J, et al, "HNRNPA2B1 regulates alternative splicing in neuronal development." Neuron (2021)](https://doi.org/10.1016/j.neuron.2021.05.020)

[Alarcon CR, Lee H, Goodarzi H, et al, "HNRNPA2B1 is an m6A reader that governs nuclear RNA processing and export." Cell (2015)](https://doi.org/10.1016/j.cell.2015.05.015)

[Liu Q, Shu S, Wang MS, et al, "ALS-associated D262V mutation in HNRNPA2B1 disrupts stress granule dynamics and nucleocytoplasmic transport." Acta Neuropathol Commun (2019)](https://doi.org/10.1186/s40478-019-0825-0)

[Benatar M, Wuu J, McHale J, et al, "Multisystem proteinopathy: evidence for phenotypic heterogeneity in ALS-FTD." Neurology (2020)](https://doi.org/10.1212/WNL.0000000000010423)

From the [SciDEX Exchange](/exchange) — scored by multi-agent debate

[Axonal RNA Transport Reconstitution](/hypothesis/h-8196b893) — 0.45 · Target: HNRNPA2B1

Pathway Diagram

The following diagram shows the key molecular relationships involving HNRNPA2B1 - Heterogeneous Nuclear Ribonucleoprotein A2/B1 discovered through SciDEX knowledge graph analysis:

Mermaid diagram (expand to render)

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Related Entities

HNRNPA2B1

▸Metadataorigin_type: v1_polymorphic_backfill

slug	genes-hnrnpa2b1
kg_node_id	HNRNPA2B1
entity_type	gene
origin_type	v1_polymorphic_backfill
source_table	wiki_pages
wiki_page_id	wp-d53dccce208e
__merged_from	{'merged_at': '2026-05-13', 'unprefixed_id': 'genes-hnrnpa2b1'}
_schema_version	1

📊 Evidence Profile Foundational

Evidence Balance

+0%

Certainty

60%

Debates

0

Incoming

12

Outgoing

45

0 supporting 0 contradicting 0 neutral

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📗 Cite This Artifact

HNRNPA2B1 - Heterogeneous Nuclear Ribonucleoprotein A2/B1

HNRNPA2B1 - Heterogeneous Nuclear Ribonucleoprotein A2/B1

Pathway Diagram

HNRNPA2B1 - Heterogeneous Nuclear Ribonucleoprotein A2/B1

Pathway Diagram

HNRNPA2B1 (Heterogeneous Nuclear Ribonucleoprotein A2/B1)

Introduction

Overview

Function

RNA Processing

Stress Granules

N6-methyladenosine (m6A) Reading

Protein Structure

Domain Organization

Post-translational Modifications

Expression Patterns

Tissue Distribution

Cellular Localization

Disease Associations

Amyotrophic Lateral Sclerosis (ALS)

Multisystem Proteinopathy (MSP)

Frontotemporal Dementia (FTD)

Pathogenesis

Prion-like Propagation

Stress Granule Dysregulation

RNA Metabolism Defects

Animal Models

Drosophila Models

Mouse Models

Therapeutic Approaches

Gene Therapy Strategies

Small Molecule Approaches

Biomarkers

See Also

External Links

Brain Atlas Resources

Background

References

Related Hypotheses

Pathway Diagram

💬 Discussion