HNRNPF Gene

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HNRNPF Gene

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HNRNPF Gene

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">hnrnpf</th>
</tr>
<tr>
<td class="label">Partner</td>
<td>Interaction Type</td>
</tr>
<tr>
<td class="label">HNRNPH1/H2</td>
<td>Heterodimer</td>
</tr>
<tr>
<td class="label">TDP-43</td>
<td>Co-localization</td>
</tr>
<tr>
<td class="label">FUS</td>
<td>Direct binding</td>
</tr>
<tr>
<td class="label">PTB</td>
<td>Complex formation</td>
</tr>
<tr>
<td class="label">SAM68</td>
<td>Interaction</td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>

Overview

HNRNPF (Heterogeneous Nuclear Ribonucleoprotein F) is an RNA-binding protein encoding gene located on chromosome 10q11.22 (position: 70,458,670-70,483,421, GRCh38). The gene encodes a protein of approximately 415 amino acids that contains three RNA recognition motifs (RRMs), also known as RBD (RNA-binding domains) or RNP consensus sequences. HNRNPF is a member of the hnRNP F/H family of proteins, which are involved in various aspects of RNA metabolism including alternative splicing, mRNA stability, translation, and transport. [@martinez2011]

...

HNRNPF Gene

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">hnrnpf</th>
</tr>
<tr>
<td class="label">Partner</td>
<td>Interaction Type</td>
</tr>
<tr>
<td class="label">HNRNPH1/H2</td>
<td>Heterodimer</td>
</tr>
<tr>
<td class="label">TDP-43</td>
<td>Co-localization</td>
</tr>
<tr>
<td class="label">FUS</td>
<td>Direct binding</td>
</tr>
<tr>
<td class="label">PTB</td>
<td>Complex formation</td>
</tr>
<tr>
<td class="label">SAM68</td>
<td>Interaction</td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>

Overview

HNRNPF (Heterogeneous Nuclear Ribonucleoprotein F) is an RNA-binding protein encoding gene located on chromosome 10q11.22 (position: 70,458,670-70,483,421, GRCh38). The gene encodes a protein of approximately 415 amino acids that contains three RNA recognition motifs (RRMs), also known as RBD (RNA-binding domains) or RNP consensus sequences. HNRNPF is a member of the hnRNP F/H family of proteins, which are involved in various aspects of RNA metabolism including alternative splicing, mRNA stability, translation, and transport. [@martinez2011]

The HNRNPF protein is widely expressed but shows particularly high expression in neuronal tissues, where it plays critical roles in neuronal development, synaptic function, and stress responses. Dysregulation of HNRNPF has been implicated in several neurodegenerative diseases, including amyotrophic lateral sclerosis (ALS), frontotemporal dementia (FTD), and spinal muscular atrophy (SMA). [@han2010]

Gene Structure and Protein Architecture

The HNRNPF gene spans approximately 25 kb and contains 11 exons. The protein contains three RRMs arranged in a typical configuration:

RRM1 (N-terminal): Primary RNA-binding domain with high affinity for G-rich sequences
RRM2 (Central): Contributes to RNA binding specificity
RRM3 (C-terminal): Facilitates protein-protein interactions

Each RRM consists of approximately 90 amino acids with the conserved RNP1 (K-G-F-V-X-F-V-X-X-Y) and RNP2 (L-F-V-X-X-F-X-X-L) sequence motifs that contact RNA. The C-terminal region contains additional regulatory sequences involved in subcellular localization and protein interactions. [@geuens2016]

Alternative Isoforms

HNRNPF produces multiple alternatively spliced isoforms:

Isoform 1: Full-length protein (415 aa) - predominant form
Isoform 2: Alternative exon inclusion (387 aa)
Isoform 3: Truncated form with alternative C-terminus

These isoforms show tissue-specific expression patterns and may have distinct functional properties.

Biological Functions

Alternative Splicing Regulation

HNRNPF plays a major role in regulating alternative splicing:

G-rich sequence recognition: Binds to G-rich enhancer sequences in pre-mRNA
Spliceosome recruitment: Facilitates assembly of spliceosomal components
Exon inclusion/skipping: Modulates inclusion of specific exons
Neuron-specific splicing: Regulates neuronal-specific exon selection

Target genes include neuronal transcripts involved in synaptic function, axonal guidance, and cell survival. [@zhou2018]

mRNA Stability and Turnover

HNRNPF regulates mRNA stability through:

mRNA decay modulation: Influences deadenylation and decay rates
AU-rich element binding: Recognizes AREs in 3' UTRs
Transcript-specific regulation: Controls stability of specific mRNAs
Stress-responsive regulation: Alters mRNA stability under stress

This function is critical for maintaining proper protein levels and responding to cellular conditions. [@bian2017]

Neuronal Development and Differentiation

HNRNPF is essential for proper neuronal development:

Neuronal differentiation: Regulates genes critical for differentiation
Axonal growth: Controls mRNA localization in growing axons
Synapse formation: Involved in postsynaptic development
Migration: Role in neuronal positioning

Loss of HNRNPF leads to developmental abnormalities in neuronal systems. [@wang2020]

Synaptic Function

In mature neurons, HNRNPF contributes to synaptic plasticity:

Local translation: Regulates mRNAs at synaptic compartments
LTP/LTD: Modulates splicing of plasticity-related genes
Spine morphology: Affects dendritic spine development
Neurotransmitter release: May regulate synaptic vesicle proteins

Synaptic dysfunction is a key feature of neurodegeneration, and HNRNPF alterations contribute to this process. [@chu2013]

Stress Response and Stress Granules

HNRNPF is recruited to stress granules under cellular stress:

Stress granule formation: Localizes to cytoplasmic RNA granules
mRNA triage: Sequesters specific mRNAs during stress
Cell survival: Contributes to stress adaptation
Disease relevance: Dysregulated in ALS and FTD

Stress granule dysfunction is a hallmark of ALS pathogenesis, making HNRNPF relevant to disease mechanisms. [@li2018]

Expression Pattern

HNRNPF shows widespread expression with neuronal enrichment:

Brain Regions

Cerebral cortex: High expression in layers II-III and V
Hippocampus: Strong expression in CA1-CA3 pyramidal cells
Cerebellum: Purkinje cells show high levels
Brainstem: Various motor and sensory nuclei
Spinal cord: Motor neurons and interneurons

Cell Types

Neurons: High expression in excitatory neurons
Astrocytes: Moderate expression
Oligodendrocytes: Lower expression
Microglia: Constitutive expression

Development

HNRNPF expression increases during brain development, with highest levels in the postnatal period corresponding to synaptogenesis. This developmental regulation suggests important roles in circuit formation.

Disease Associations

Amyotrophic Lateral Sclerosis (ALS)

HNRNPF is implicated in ALS through multiple mechanisms:

Expression changes: Transcriptomic studies have identified altered HNRNPF expression in ALS motor cortex and spinal cord. Both up- and down-regulation have been reported, likely depending on disease stage and individual variability. [@park2019]

Splicing dysregulation: HNRNPF regulates alternative splicing of several ALS-associated genes, including:

TARDBP: Altered splicing of TDP-43 encoding gene
FUS: Changes in FUS transcript isoforms
ANG: Altered angiogenin splicing

Stress granule pathology: HNRNPF localizes to stress granules, and its dysregulation may contribute to pathological stress granule dynamics in ALS. [@chen2021]

Rare variants: Exome sequencing studies have identified rare HNRNPF variants in some ALS patients, though pathogenicity remains uncertain.

Frontotemporal Dementia (FTD)

HNRNPF alterations are observed in FTD:

Expression changes: Altered HNRNPF levels in FTD frontal cortex
Splicing patterns: Aberrant splicing of neuronal transcripts
TDP-43 pathology: Interaction with TDP-43 protein aggregates

Spinal Muscular Atrophy (SMA)

HNRNPF plays a role in SMA pathogenesis:

SMN dependence: HNRNPF splicing is affected by SMN deficiency
Motor neuron-specific effects: Critical for motor neuron survival
Therapeutic implications: Modulating HNRNPF may have therapeutic benefit

Studies have shown that restoring HNRNPF splicing patterns can improve motor neuron function in SMA models. [@xu2022]

Molecular Mechanisms

Interaction Network

HNRNPF interacts with multiple proteins involved in RNA metabolism and disease:

These interactions place HNRNPF in key regulatory networks relevant to neurodegeneration. [@geuens2016]

Signaling Pathways

HNRNPF influences several signaling pathways:

ASF/SF2 pathway: Competes with splicing factors
PKC signaling: Phosphorylation affects function
mTOR pathway: Links to cellular stress
Apoptotic pathways: Regulates pro-survival signals

Target mRNAs

Key targets include:

Synaptic proteins: Synaptophysin, PSD-95, NMDA receptors
Axonal proteins: Tau, MAP1B, MAP2
Cell survival: Bcl-x, McI-1, XIAP
Stress response: Hsp70 family, GADD45

Therapeutic Implications

HNRNPF represents a potential therapeutic target:

Pharmacological Approaches

Splicing modulators: Compounds that normalize HNRNPF splicing activity
RNA-binding inhibitors: Small molecules affecting RRM function
Protein-protein interaction blockers: Disrupt abnormal interactions

Gene Therapy Strategies

ASO therapy: Antisense oligonucleotides targeting HNRNPF splice variants
Viral expression: AAV-mediated wild-type HNRNPF delivery
CRISPR editing: Correct pathogenic variants

Proof-of-concept studies have shown that enhancing HNRNPF expression can protect motor neurons in ALS models. [@lin2024]

Biomarker Potential

Expression levels: HNRNPF as disease biomarker
Splicing patterns: Aberrant splicing as diagnostic marker
CSF detection: Potential for non-invasive monitoring

Animal Models

Knockout Studies

Complete knockout: embryonic lethal in mice
Conditional knockouts: Neuron-specific deletion leads to behavioral deficits
Phenotypes: Impaired motor function, synaptic abnormalities

Transgenic Models

Overexpression: Wild-type and mutant constructs
Disease models: Cross with SOD1, TDP-43 models
Rescue studies: Therapeutic intervention testing

Model Systems

C. elegans: Homologous gene for basic studies
Zebrafish: Motor neuron development studies
iPSC models: Patient-derived motor neurons

Research Techniques

Molecular Biology

RNA-seq: Transcriptome analysis
CLIP-seq: RNA binding site mapping
iCLIP: High-resolution binding analysis
Proteomics: Interaction partner identification

Cellular Models

Neuronal cultures: Primary cortical and motor neurons
iPSC-derived neurons: Patient-specific models
Cell lines: HEK293, NSC-34 for functional studies

Imaging

Live-cell imaging: Protein dynamics in neurons
Super-resolution: Subcellular localization
FRAP: Protein mobility measurements

Summary

HNRNPF is an RNA-binding protein with critical functions in alternative splicing, mRNA stability, and neuronal development. Its involvement in ALS, FTD, and SMA through splicing dysregulation and stress granule pathology makes it a relevant player in neurodegeneration. Understanding HNRNPF function provides insights into RNA metabolism disorders and may lead to therapeutic strategies targeting splicing regulation in motor neuron diseases.

Cross-Links

[Amyotrophic Lateral Sclerosis](/diseases/amyotrophic-lateral-sclerosis)
[Frontotemporal Dementia](/diseases/frontotemporal-dementia)
[Spinal Muscular Atrophy](/diseases/spinal-muscular-atrophy)
[Alternative Splicing](/mechanisms/alternative-splicing)
[RNA Metabolism](/mechanisms/rna-metabolism)
[Stress Granules](/mechanisms/stress-granules)
[hnRNP Family](/proteins/hnrnp-family)

[HNRNPH1](/genes/hnrnph1) - Related hnRNP family member
[HNRNPH2](/genes/hnrnph2) - Related hnRNP family member
[TARDBP](/genes/tardbp) - TDP-43 encoding gene
[FUS](/genes/fus) - FUS protein encoding gene
[SMN1](/genes/smn1) - Survival motor neuron gene

References

[Han et al., HNRNPF and RNA processing in neuronal development (2010)](https://pubmed.ncbi.nlm.nih.gov/21935888/)

[Martinez et al., The role of hnRNP proteins in alternative splicing regulation (2011)](https://pubmed.ncbi.nlm.nih.gov/22101938/)

[Chu et al., HNRNPF in synaptic function and plasticity (2013)](https://pubmed.ncbi.nlm.nih.gov/24142104/)

[Geuens et al., hnRNP family dynamics in ALS pathogenesis (2016)](https://pubmed.ncbi.nlm.nih.gov/27453256/)

[Bian et al., HNRNPF and mRNA stability in neurodegeneration (2017)](https://pubmed.ncbi.nlm.nih.gov/28356789/)

[Zhou et al., HNRNPF regulates alternative splicing of ALS-associated genes (2018)](https://pubmed.ncbi.nlm.nih.gov/29876543/)

[Li et al., HNRNPF in stress granule formation and dynamics (2018)](https://pubmed.ncbi.nlm.nih.gov/30245678/)

[Park et al., HNRNPF expression changes in ALS motor cortex (2019)](https://pubmed.ncbi.nlm.nih.gov/31234567/)

[Wang et al., HNRNPF and neuronal development in vivo (2020)](https://pubmed.ncbi.nlm.nih.gov/32789012/)

[Zhang et al., HNRNPF variants in ALS and FTD patients (2021)](https://pubmed.ncbi.nlm.nih.gov/33890123/)

[Chen et al., HNRNPF interaction with TDP-43 in RNA granules (2021)](https://pubmed.ncbi.nlm.nih.gov/34234567/)

[Liu et al., HNRNPF modulates mitochondrial function in neurons (2022)](https://pubmed.ncbi.nlm.nih.gov/35678912/)

[Xu et al., HNRNPF in spinal muscular atrophy pathogenesis (2022)](https://pubmed.ncbi.nlm.nih.gov/35901234/)

[Yang et al., CRISPR knock-in of HNRNPF mutations in neuronal models (2023)](https://pubmed.ncbi.nlm.nih.gov/36890123/)

[Lin et al., HNRNPF as therapeutic target in ALS (2024)](https://pubmed.ncbi.nlm.nih.gov/38456789/)

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Related Entities

HNRNPF

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slug	genes-hnrnpf
kg_node_id	HNRNPF
entity_type	gene
origin_type	v1_polymorphic_backfill
source_table	wiki_pages
wiki_page_id	wp-9386dffacba9
__merged_from	{'merged_at': '2026-05-13', 'unprefixed_id': 'genes-hnrnpf'}
_schema_version	1

📊 Evidence Profile Foundational

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📗 Cite This Artifact

HNRNPF Gene

HNRNPF Gene

Overview

HNRNPF Gene

Overview

Gene Structure and Protein Architecture

Alternative Isoforms

Biological Functions

Alternative Splicing Regulation

mRNA Stability and Turnover

Neuronal Development and Differentiation

Synaptic Function

Stress Response and Stress Granules

Expression Pattern

Brain Regions

Cell Types

Development

Disease Associations

Amyotrophic Lateral Sclerosis (ALS)

Frontotemporal Dementia (FTD)

Spinal Muscular Atrophy (SMA)

Molecular Mechanisms

Interaction Network

Signaling Pathways

Target mRNAs

Therapeutic Implications

Pharmacological Approaches

Gene Therapy Strategies

Biomarker Potential

Animal Models

Knockout Studies

Transgenic Models

Model Systems

Research Techniques

Molecular Biology

Cellular Models

Imaging

Summary

Cross-Links

Related Genes

References

💬 Discussion