HNRNPUL1 Protein

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HNRNPUL1 Protein

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HNRNPUL1 Protein — Heterogeneous Nuclear Ribonucleoprotein U-Like 1

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">HNRNPUL1 Protein</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>HNRNPUL1</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>HNRNPUL1</td>
</tr>
<tr>
<td class="label">Type</td>
<td>Protein</td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/?query=HNRNPUL1" target="_blank">Search UniProt</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>

Introduction

Hnrnpul1 Protein 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

HNRNPUL1 (Heterogeneous Nuclear Ribonucleoprotein U-Like 1) is a nuclear RNA-binding protein that plays critical roles in RNA processing, transcription regulation, DNA repair, and chromatin organization. Encoded by the HNRNPUL1 gene located on chromosome 19q13.43, this protein is a member of the hnRNP U family, which includes HNRNPU (hnRNP U), HNRNPUL1, and HNRNPUL2. These proteins are essential for maintaining genomic stability and proper gene expression in neurons, and their dysfunction has been implicated in neurodegenerative diseases including amyotrophic lateral sclerosis (ALS) and Alzheimer's disease (AD). [@hnrnpula]

...

HNRNPUL1 Protein — Heterogeneous Nuclear Ribonucleoprotein U-Like 1

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">HNRNPUL1 Protein</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>HNRNPUL1</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>HNRNPUL1</td>
</tr>
<tr>
<td class="label">Type</td>
<td>Protein</td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/?query=HNRNPUL1" target="_blank">Search UniProt</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>

Introduction

Hnrnpul1 Protein 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

HNRNPUL1 (Heterogeneous Nuclear Ribonucleoprotein U-Like 1) is a nuclear RNA-binding protein that plays critical roles in RNA processing, transcription regulation, DNA repair, and chromatin organization. Encoded by the HNRNPUL1 gene located on chromosome 19q13.43, this protein is a member of the hnRNP U family, which includes HNRNPU (hnRNP U), HNRNPUL1, and HNRNPUL2. These proteins are essential for maintaining genomic stability and proper gene expression in neurons, and their dysfunction has been implicated in neurodegenerative diseases including amyotrophic lateral sclerosis (ALS) and Alzheimer's disease (AD). [@hnrnpula]

HNRNPUL1 is characterized by its unique ability to bind both RNA and DNA, making it a versatile regulator of nuclear processes. The protein participates in multiple protein complexes involved in RNA splicing, transcription elongation, DNA double-strand break repair, and telomere maintenance. Its involvement in multiple essential cellular processes makes it a protein of significant interest in understanding neurodegeneration mechanisms. [@hnrnpulb]

Structure

HNRNPUL1 is a large nuclear protein approximately 502 kDa in molecular weight, consisting of multiple functional domains that mediate its diverse cellular functions: [@dna]

Domain Architecture

N-terminal Glycine-Rich Region: Contains multiple RGG (Arg-Gly-Gly) repeats that function as RNA-binding motifs. These RGG boxes are characteristic of RNA-binding proteins and enable HNRNPUL1 to bind to various RNA species including mRNA, lncRNA, and snRNA.
SAF-A/B, Acinus, and PIAS (SAP) Domain: Located in the central region of the protein, this domain mediates protein-protein interactions and DNA binding. The SAP domain is involved in transcriptional regulation and chromatin organization.
Hinge Region: A proline-rich flexible region that allows conformational changes and serves as a binding platform for multiple protein partners.
C-terminal Region: Contains additional binding sites for protein partners including PARP1, TLS/FUS, and various transcription factors.

Post-Translational Modifications

HNRNPUL1 undergoes several post-translational modifications that regulate its function: [@alternative]

Phosphorylation: Multiple serine/threonine phosphorylation sites regulate protein-protein interactions and subcellular localization
PARylation: Poly-ADP-ribosylation by PARP1 is a critical regulatory modification during DNA damage response
Methylation: Arginine methylation affects RNA-binding properties

Normal Function

RNA Processing and Splicing

HNRNPUL1 is a component of various ribonucleoprotein complexes involved in RNA processing: [@hnrnp]

Spliceosome Component: Associates with the spliceosome complex and regulates alternative splicing of pre-mRNA
RNA Export: Facilitates export of processed mRNA from nucleus to cytoplasm through interactions with export factors
RNA Stability: Binds to specific mRNA transcripts to regulate mRNA stability and translation
Non-coding RNA Processing: Involved in processing of various non-coding RNAs including small nuclear RNAs (snRNAs) and long non-coding RNAs (lncRNAs)

Transcription Regulation

HNRNPUL1 plays multiple roles in transcriptional control: [@parp]

Transcriptional Elongation: Associates with RNA polymerase II and regulates transcription elongation through interaction with elongation factors
Chromatin Remodeling: Modulates chromatin structure through interactions with histone modifiers and chromatin remodeling complexes
Transcriptional Co-activator: Functions as a co-activator for various transcription factors including nuclear receptors
RNA Polymerase I: Participates in ribosomal RNA transcription in the nucleolus

DNA Repair

One of the most critical functions of HNRNPUL1 is its role in DNA double-strand break (DSB) repair: [@telomere]

PARP1-Dependent Pathway: HNRNPUL1 is recruited to DNA damage sites in a PARP1-dependent manner
Alternative End Joining: Promotes alternative end joining (alt-EJ) repair of DSBs through interaction with DNA polymerases (Pol theta) and Ligase III
Chromatin Surveillance: Maintains chromatin integrity during repair processes
Telomere Maintenance: Associates with shelterin complex proteins to protect telomere ends

Protein-Protein Interactions

HNRNPUL1 interacts with numerous proteins to carry out its functions: [@rna]

PARP1: Poly-ADP-ribose polymerase 1 - central to DNA damage response
TLS/FUS: Translocated in liposarcoma/Fused in sarcoma - involved in ALS pathogenesis
HNRNPU: Canonical hnRNP U protein - related family member with overlapping functions
EMSY: Transcriptional regulator involved in DNA damage response
BRCA2: Breast cancer type 2 susceptibility protein - DNA repair co-factor
ATR: Ataxia telangiectasia and Rad3 related - DNA damage checkpoint kinase

Role in Disease

Amyotrophic Lateral Sclerosis (ALS)

HNRNPUL1 has been implicated in ALS pathogenesis through multiple mechanisms: [@chromatin]

Genetic Variants: Rare HNRNPUL1 variants have been identified in ALS patients, suggesting a potential role in disease susceptibility
RNA Metabolism Dysregulation: Loss of proper HNRNPUL1 function leads to impaired RNA processing in motor neurons
DNA Repair Defects: Impaired DNA repair capacity in motor neurons makes them vulnerable to accumulation of DNA damage
Protein Aggregation: Altered HNRNPUL1 may contribute to stress granule formation and RNA aggregation
Motor Neuron Vulnerability: Motor neurons are particularly dependent on proper RNA metabolism and DNA repair, making them sensitive to HNRNPUL1 dysfunction

Alzheimer's Disease

HNRNPUL1 dysregulation contributes to Alzheimer's disease pathogenesis: [@hnrnpulc]

Transcriptional Dysregulation: Altered HNRNPUL1 affects expression of genes involved in neuronal survival and synaptic function
DNA Repair Impairment: Reduced DNA repair capacity contributes to neuronal genome instability
[Tau](/proteins/tau) Pathology: HNRNPUL1 dysfunction may affect [tau](/proteins/tau) splicing and aggregation
Synaptic Dysfunction: Altered RNA processing affects synaptic protein expression
Neuronal [Apoptosis](/entities/apoptosis): DNA repair defects and transcriptional dysregulation promote apoptotic pathways

Cancer

While primarily relevant to neurodegeneration, HNRNPUL1 is also studied in cancer: [@therapeutic]

Oncogenic Functions: Overexpression in various cancers associated with poor prognosis
DNA Repair in Cancer: Cancer cells may exploit HNRNPUL1-mediated DNA repair for survival
Therapeutic Target: Potential target for cancer therapy through synthetic lethality approaches

Therapeutic Targeting

Therapeutic Approaches

RNA Metabolism Modulation: Developing compounds that restore proper RNA processing
DNA Repair Enhancement: Pharmacological enhancement of DNA repair mechanisms
Protein-Protein Interaction Inhibitors: Blocking pathological interactions (e.g., with FUS/TLS)
Gene Therapy: Potential for viral vector-mediated HNRNPUL1 delivery

Research Challenges

[Blood-Brain Barrier](/entities/blood-brain-barrier): Therapeutic delivery to CNS remains challenging
Specificity: Achieving target specificity for HNRNPUL1 modulators
Timing: Early intervention likely necessary for maximal benefit

Interaction Network

HNRNPUL1 participates in a complex network of protein interactions:

DNA Repair Network

PARP1 - Poly-ADP-ribose polymerase 1
DNA Pol theta - DNA polymerase theta
Ligase III - DNA ligase III
XRCC1 - X-ray repair cross-complementing 1
BRCA2 - Breast cancer type 2 susceptibility protein

RNA Processing Network

HNRNPU - Heterogeneous nuclear ribonucleoprotein U
HNRNPUL2 - HNRNPUL1-like protein 2
SRSF1 - Serine/arginine-rich splicing factor 1
U2AF1 - U2 small nuclear RNA auxiliary factor 1

Transcription Network

RNA Polymerase II - Transcriptional machinery
EMSY - Transcriptional regulator
BRD4 - Bromodomain-containing protein 4
Various transcription factors

FUS/TLS - Fused in sarcoma
[TDP-43](/proteins/tdp-43) - TAR DNA-binding protein 43
SOD1 - Superoxide dismutase 1
[C9orf72](/entities/c9orf72) - Chromosome 9 open reading frame 72

Animal Models

Mouse Models

Hnrnpul1 Knockout: embryonic lethal, indicating essential function
Conditional Knockouts: tissue-specific deletions to study neuronal functions
ALS Models: crossing with ALS mouse models to test genetic interactions

Model Systems

Cell Culture: neuronal cell lines for mechanism studies
iPSC-derived [Neurons](/entities/neurons): patient-specific neurons for disease modeling
Yeast: simple model for protein function studies

Research Methods

Molecular Biology

Co-immunoprecipitation: Identify protein-protein interactions
RNA immunoprecipitation (RIP): Map RNA binding targets
CLIP-seq: Genome-wide RNA binding sites
ChIP-seq: Chromatin binding patterns

DNA Repair Studies

Comet Assay: Measure DNA damage and repair
gammaH2AX foci: Visualize DNA double-strand breaks
Reporter Assays: Measure repair pathway choice

Neurobiology

Electrophysiology: Measure neuronal function
Calcium Imaging: Monitor neuronal activity
Live-cell Imaging: Protein dynamics in neurons

Background

The study of Hnrnpul1 Protein 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.

External Links

[PubMed](https://pubmed.ncbi.nlm.nih.gov/) - Biomedical literature
[Alzheimer's Disease Neuroimaging Initiative](https://adni.loni.usc.edu/) - Research data
[Allen Brain Atlas](https://brain-map.org/) - Brain gene expression data

References

[Unknown, - HNRNPUL1 in ALS pathogenesis and RNA metabolism (n.d.)](https://pubmed.ncbi.nlm.nih.gov/30271395/)

[Unknown, - HNRNPUL1 and DNA repair mechanisms (n.d.)](https://pubmed.ncbi.nlm.nih.gov/31558825/)

[Unknown, - HNRNPUL1 in transcriptional regulation (n.d.)](https://pubmed.ncbi.nlm.nih.gov/32977328/)

[Unknown, - DNA double-strand break repair in neurodegeneration (n.d.)](https://pubmed.ncbi.nlm.nih.gov/34228547/)

[Unknown, - Alternative end joining and ALS risk (n.d.)](https://pubmed.ncbi.nlm.nih.gov/35608621/)

[Unknown, - hnRNP family in neuronal function (n.d.)](https://pubmed.ncbi.nlm.nih.gov/28844653/)

[Unknown, - PARP1 and HNRNPUL1 in DNA damage response (n.d.)](https://pubmed.ncbi.nlm.nih.gov/25823536/)

[Unknown, - Telomere biology in neurodegeneration (n.d.)](https://pubmed.ncbi.nlm.nih.gov/27554407/)

[Unknown, - RNA binding proteins in ALS (n.d.)](https://pubmed.ncbi.nlm.nih.gov/28632496/)

[Unknown, - Chromatin remodeling in neuronal disease (n.d.)](https://pubmed.ncbi.nlm.nih.gov/30194267/)

[Unknown, - HNRNPUL1 expression in Alzheimer's disease (n.d.)](https://pubmed.ncbi.nlm.nih.gov/30542052/)

[Unknown, - Therapeutic targeting of RNA metabolism (n.d.)](https://pubmed.ncbi.nlm.nih.gov/32060173/)

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Related Entities

HNRNPUL1PROTEIN

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entity_type	protein
origin_type	v1_polymorphic_backfill
source_table	wiki_pages
wiki_page_id	wp-0a373d5f6f29
__merged_from	{'merged_at': '2026-05-13', 'unprefixed_id': 'proteins-hnrnpul1-protein'}
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📊 Evidence Profile Foundational

Evidence Balance

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Certainty

50%

Debates

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Incoming

10

Outgoing

13

0 supporting 0 contradicting 0 neutral

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📗 Cite This Artifact

HNRNPUL1 Protein

HNRNPUL1 Protein — Heterogeneous Nuclear Ribonucleoprotein U-Like 1

Introduction

Overview

HNRNPUL1 Protein — Heterogeneous Nuclear Ribonucleoprotein U-Like 1

Introduction

Overview

Structure

Domain Architecture

Post-Translational Modifications

Normal Function

RNA Processing and Splicing

Transcription Regulation

DNA Repair

Protein-Protein Interactions

Role in Disease

Amyotrophic Lateral Sclerosis (ALS)

Alzheimer's Disease

Cancer

Therapeutic Targeting

Therapeutic Approaches

Research Challenges

Interaction Network

DNA Repair Network

RNA Processing Network

Transcription Network

Animal Models

Mouse Models

Model Systems

Research Methods

Molecular Biology

DNA Repair Studies

Neurobiology

Background

External Links

See Also

References

💬 Discussion

📗 Cite This Artifact

HNRNPUL1 Protein

HNRNPUL1 Protein — Heterogeneous Nuclear Ribonucleoprotein U-Like 1

Introduction

Overview

HNRNPUL1 Protein — Heterogeneous Nuclear Ribonucleoprotein U-Like 1

Introduction

Overview

Structure

Domain Architecture

Post-Translational Modifications

Normal Function

RNA Processing and Splicing

Transcription Regulation

DNA Repair

Protein-Protein Interactions

Role in Disease

Amyotrophic Lateral Sclerosis (ALS)

Alzheimer's Disease

Cancer

Therapeutic Targeting

Therapeutic Approaches

Research Challenges

Interaction Network

DNA Repair Network

RNA Processing Network

Transcription Network

ALS-Related Network

Animal Models

Mouse Models

Model Systems

Research Methods

Molecular Biology

DNA Repair Studies

Neurobiology

Background

External Links

See Also

References

💬 Discussion