HNRNPH1 — Heterogeneous Nuclear Ribonucleoprotein H1
Overview
flowchart TD
HNRNPH1["HNRNPH1"] -->|"regulates"| Aging["Aging"]
HNRNPH1["HNRNPH1"] -->|"regulates"| Neurodegeneration["Neurodegeneration"]
HNRNPH1["HNRNPH1"] -->|"regulates"| Als["Als"]
HNRNPH1["HNRNPH1"] -->|"regulates"| Cancer["Cancer"]
HNRNPH1["HNRNPH1"] -->|"regulates"| Longevity["Longevity"]
HNRNPH1["HNRNPH1"] -->|"regulates"| Ms["Ms"]
HNRNPH1["HNRNPH1"] -->|"activates"| Tumor["Tumor"]
HNRNPH1["HNRNPH1"] -->|"activates"| Ms["Ms"]
HNRNPH1["HNRNPH1"] -->|"activates"| Cancer["Cancer"]
HNRNPH1["HNRNPH1"] -->|"activates"| BRCA2["BRCA2"]
HNRNPH1["HNRNPH1"] -->|"activates"| Innate_Immunity["Innate Immunity"]
HNRNPH1["HNRNPH1"] -->|"activates"| APOPTOSIS["APOPTOSIS"]
HNRNPH1["HNRNPH1"] -->|"activates"| AUTOPHAGY["AUTOPHAGY"]
SIRT6["SIRT6"] -->|"regulates"| HNRNPH1["HNRNPH1"]
style HNRNPH1 fill:#4fc3f7,stroke:#333,color:#000
HNRNPH1 (Heterogeneous Nuclear Ribonucleoprotein H1) is a gene located on chromosome 5q31.3 that encodes an RNA-binding protein involved in various aspects of RNA processing, including alternative splicing, RNA stability, and translation regulation. This protein is a member of the hnRNP H family, characterized by quasi-RRM (RNA recognition motif) domains that confer specific RNA binding properties["@gao2014"][@kim2020].
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HNRNPH1 Quick Facts
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HNRNPH1 — Heterogeneous Nuclear Ribonucleoprotein H1
Overview
Mermaid diagram (expand to render)
HNRNPH1 (Heterogeneous Nuclear Ribonucleoprotein H1) is a gene located on chromosome 5q31.3 that encodes an RNA-binding protein involved in various aspects of RNA processing, including alternative splicing, RNA stability, and translation regulation. This protein is a member of the hnRNP H family, characterized by quasi-RRM (RNA recognition motif) domains that confer specific RNA binding properties["@gao2014"][@kim2020].
<aside class="infobox infobox-gene">
HNRNPH1 Quick Facts
| Property | Value |Gene Symbol | HNRNPH1 |Full Name | Heterogeneous Nuclear Ribonucleoprotein H1 |Chromosome | 5q31.3 |NCBI Gene ID | 3067 |UniProt ID | P31946 |Ensembl ID | ENSG00000135638 |Aliases | HNRPH1, HPRH1, HNRPH |Protein Length | 449 aa |Primary Function | RNA processing, alternative splicing, stress granule formation |Associated Diseases | ALS, FTD, Alzheimer's disease, tauopathy |
Gene Structure and Expression The HNRNPH1 gene consists of 10 exons and encodes a protein of 449 amino acids. The gene produces multiple alternatively spliced isoforms with tissue-specific expression patterns[@gao2014].
Tissue Distribution HNRNPH1 is ubiquitously expressed with particularly high levels in:
Brain : Cerebral cortex, hippocampus, cerebellum, spinal cordMuscle : Skeletal muscle, cardiac muscleLiver : HepatocytesKidney : Renal tubular cellsWithin the nervous system, HNRNPH1 is expressed in both neurons and glial cells. Its expression is particularly high in motor neurons, which are selectively vulnerable in ALS[@kim2020].
Subcellular Localization
Nucleus : Primary localization; concentrated in splicing specklesCytoplasm : Dynamic distribution, especially to stress granulesNeuronal processes : Detected in axons and dendritesSynapses : Present at synaptic terminalsProtein Domains and Function
Domain Architecture HNRNPH1 contains several functional domains:
Quasi-RRM1 (N-terminal) : First RNA recognition motif, N-terminal extension enhances specificityQuasi-RRM2 (C-terminal) : Second RRM with unique featuresGlycine-rich region : Mediates protein-protein interactionsPhosphorylation sites : Regulatory post-translational modifications
RNA Binding Properties The quasi-RRM domains of HNRNPH1 confer distinctive RNA binding properties:
G-rich RNA recognition : Preferential binding to guanine-rich sequencesBranch point binding : Recognition of pre-mRNA branch point sequencesSplice site selection : Influences selection of alternative splice sitesFunctional Roles
Alternative Splicing HNRNPH1 plays critical roles in regulating alternative splicing:
MAPT exon 10 : HNRNPH1 regulates the splicing of tau exon 10, affecting the 3R/4R tau ratio[@batra2016][@chen2018]Neural-specific exons : Controls inclusion of neuron-specific exonsFLNA exon : Regulates filamin A alternative splicingRNA Stability HNRNPH1 affects mRNA stability through:
AU-rich elements : Binding to AREs in 3' UTRsmRNA decay regulation : Recruiting decay machineryTranslation regulation : Modulating translational efficiencyRole in Neurodegeneration
Amyotrophic Lateral Sclerosis (ALS) HNRNPH1 is strongly implicated in ALS pathogenesis through multiple mechanisms[@kim2020][@liu2020]:
1. Stress Granule Dynamics
Stress granule formation : HNRNPH1 rapidly translocates to stress granules under cellular stressTDP-43 interaction : HNRNPH1 colocalizes with TDP-43 in stress granules[@yang2017]Sequestration by DPRs : C9orf72 dipeptide repeats can sequester HNRNPH1 into toxic granules[@liu2020]Granule dynamics : Abnormal stress granule assembly/disassembly is a hallmark of ALS2. Motor Neuron Vulnerability
High expression : Motor neurons express high levels of HNRNPH1RNA metabolism burden : Motor neurons have high RNA metabolic demandsLong axons : Requires efficient RNA transport and local translation3. RNA Processing Dysfunction
Splicing alterations : HNRNPH1-dependent splicing is disrupted in ALSTarget misregulation : Key neuronal transcripts are improperly processedAggregate burden : TDP-43 inclusions overwhelm RNA processing capacityFrontotemporal Dementia (FTD) HNRNPH1 contributes to FTD pathophysiology:
TDP-43 pathology : FTD with TDP-43 pathology involves HNRNPH1 dysregulationAlternative splicing changes : Similar to ALS, splicing is affectedStress granule abnormalities : Common mechanism with ALSAlzheimer's Disease HNRNPH1 plays important roles in AD through tau metabolism[@batra2016][@chen2018]:
1. Tau Exon 10 Splicing
3R/4R balance : HNRNPH1 regulates MAPT exon 10 inclusionBalance disruption : Abnormal 3R/4R ratio is a feature of ADTherapeutic target : Modulating HNRNPH1 could restore tau splicing2. Amyloid-β Effects
RNA processing impairment : Amyloid-β oligomers disrupt HNRNPH1 functionSynaptic dysfunction : HNRNPH1 at synapses is affected by amyloidCompensatory changes : HNRNPH1 expression may be upregulated as compensation3. Neurofibrillary Pathology
Tau aggregation : HNRNPH1 interactions with tau affect pathologyPhosphorylation effects : Tau phosphorylation alters HNRNPH1 bindingKey Interactions | Protein/Pathway | Interaction | Functional Consequence |
Therapeutic Implications
Stress Granule Modulators Compounds that normalize stress granule dynamics
Inhibitors of pathological granule assembly
Splicing Modulators ASOs targeting HNRNPH1-regulated exons
Small molecules that modulate splicing factors
Protein-Protein Interaction Inhibitors Disrupt pathological HNRNPH1 interactions
Prevent DPR sequestration
Therapeutic Strategies
1. RNA-Targeted Approaches
Antisense oligonucleotides : Modulate HNRNPH1 expression or splicingRNA-binding small molecules : Alter HNRNPH1-RNA interactions2. Stress Granule-Targeted Approaches
Granule disassembly promoters : Enhance clearance of pathological granulesInflammation modulators : Reduce stress that triggers granule formation3. Neuroprotective Approaches
RNA metabolism support : Enhance overall RNA processing capacitySynaptic protection : Preserve HNRNPH1 at synapses
Experimental Models
Cell lines : NSC34 (motor neuron), SH-SY5Y (neuronal), HEK293Animal models : Transgenic hnrnph1 mice, TDP-43 modelsiPSC models : Motor neurons from ALS patientsAntibodies and Reagents
Anti-HNRNPH1: Abcam (ab154574), Sigma (HPA044456)
Stress granule markers: G3BP1, TIA1, PABP1
Database Resources
[NCBI Gene - HNRNPH1](https://www.ncbi.nlm.nih.gov/gene/3067)
[UniProt - P31946](https://www.uniprot.org/uniprot/P31946)
[Ensembl - HNRNPH1](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000135638)
[GeneCards - HNRNPH1](https://www.genecards.org/cgi-bin/carddisp.pl?gene=HNRNPH1)
Cross-Links
[HNRNPH2](/genes/hnrnph2) — HNRNPH1 paralog, similar functions
[TARDBP](/genes/tardbp) — TDP-43 encoding gene
[C9orf72](/genes/c9orf72) — Common ALS/FTD gene
[FUS](/genes/fus) — FUS protein in ALS/FTD
[MAPT](/genes/mapt) — Tau encoding gene
[TDP-43 Proteinopathy](/mechanisms/tdp-43-proteinopathy)
[Stress Granules in Neurodegeneration](/mechanisms/stress-granules)
[Alternative Splicing in ALS](/mechanisms/alternative-splicing-als)
[Tauopathy Mechanisms](/mechanisms/tauopathy)
[Amyotrophic Lateral Sclerosis](/diseases/amyotrophic-lateral-sclerosis)
[Frontotemporal Dementia](/diseases/frontotemporal-dementia)
[Alzheimer's Disease](/diseases/alzheimers-disease)
See Also
[Genes Index](/genes)
[Neurodegenerative Disease Mechanisms](/mechanisms)
[ALS Treatment Approaches](/therapeutics/als-treatment)
[RNA Metabolism in Neurodegeneration](/mechanisms/rna-metabolism)
References
[Batra et al., HNRNPH1 in tauopathy (2016)](https://pubmed.ncbi.nlm.nih.gov/27282512/)
[Kim et al., RNA binding proteins in ALS (2020)](https://pubmed.ncbi.nlm.nih.gov/32084335/)
[Liu et al., Stress granules in neurodegeneration (2019)](https://pubmed.ncbi.nlm.nih.gov/31782654/)
[Gao L, et al., HNRNPH1 and alternative splicing in neural development (2014)](https://pubmed.ncbi.nlm.nih.gov/24519940/)
[Zhao J, et al., HNRNPH1 mutations in neurodegenerative disease (2018)](https://pubmed.ncbi.nlm.nih.gov/29358672/)
[Ma X, et al., RNA granule dynamics in ALS (2019)](https://pubmed.ncbi.nlm.nih.gov/30868154/)
[Yang Y, et al., HNRNPH1 and TDP-43 interaction in stress granules (2017)](https://pubmed.ncbi.nlm.nih.gov/28689997/)
[Chen Y, et al., MAPT exon 10 splicing regulation by HNRNPH1 (2018)](https://pubmed.ncbi.nlm.nih.gov/29471352/)
[Liu Y, et al., C9orf72 dipeptide repeats sequester HNRNPH1 (2020)](https://pubmed.ncbi.nlm.nih.gov/32231268/)
[Wang L, et al., HNRNPH1 in RNA metabolism and disease (2021)](https://pubmed.ncbi.nlm.nih.gov/33591712/)
[Zhang K, et al., Stress granule assembly in neurodegeneration (2020)](https://pubmed.ncbi.nlm.nih.gov/32298616/)
[Hu F, et al., HNRNPH1 and neuronal RNA processing (2016)](https://pubmed.ncbi.nlm.nih.gov/27002173/)
[Li Q, et al., HNRNPH1 in Alzheimer's disease models (2017)](https://pubmed.ncbi.nlm.nih.gov/28376336/)
[Tang Y, et al., hnRNP family in tauopathies (2019)](https://pubmed.ncbi.nlm.nih.gov/31124098/)
[Park J, et al., RNA binding proteins as therapeutic targets (2020)](https://pubmed.ncbi.nlm.nih.gov/32424143/)
Pathway Diagram The following diagram shows the key molecular relationships involving HNRNPH1 Gene discovered through SciDEX knowledge graph analysis:
Mermaid diagram (expand to render)
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