HNRNPD Gene

Introduction

Hnrnpd 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. ^{1HnRNP D0 regulates RNA metabolism in neurodegenerative disease2012 · Trends in Neurosciences · DOI 10.1016/j.tics.2012.08.004Open reference}

Overview

flowchart TD
    HNRNPD["HNRNPD"] -->|"interacts with"| ZHX2["ZHX2"]
    HNRNPD["HNRNPD"] -->|"stabilizes"| SERPINA3["SERPINA3"]
    HNRNPD["HNRNPD"] -->|"inhibits"| DNA_end_resection["DNA-end resection"]
    HNRNPD["HNRNPD"] -->|"binds"| dU["dU"]
    HNRNPD["HNRNPD"] -->|"regulates"| dU_repair["dU repair"]
    HNRNPD["HNRNPD"] -->|"upregulates"| FOXM1["FOXM1"]
    HNRNPD["HNRNPD"] -->|"expressed in"| PI3K["PI3K"]
    HNRNPD["HNRNPD"] -->|"expressed in"| HSP90B1["HSP90B1"]
    HNRNPD["HNRNPD"] -->|"expressed in"| DDX5["DDX5"]
    HNRNPD["HNRNPD"] -->|"expressed in"| SOD2["SOD2"]
    HNRNPD["HNRNPD"] -->|"expressed in"| AKT["AKT"]
    HNRNPD["HNRNPD"] -->|"expressed in"| VEGFA["VEGFA"]
    THOR["THOR"] -->|"interacts with"| HNRNPD["HNRNPD"]
    NPM_ALK["NPM-ALK"] -->|"interacts with"| HNRNPD["HNRNPD"]
    style HNRNPD fill:#4fc3f7,stroke:#333,color:#000

HNRNPD (Heterogeneous Nuclear Ribonucleoprotein D) is a gene located on chromosome 4q21.22 that encodes an RNA-binding protein involved in post-transcriptional gene regulation. HNRNPD, also known as HuR, is a member of the ELAV-like family of RNA-binding proteins and plays critical roles in mRNA stability, alternative splicing, and translation regulation. The protein contains multiple RNA recognition motifs (RRMs) and binds to AU-rich elements (AREs) in the 3’ untranslated regions of target mRNAs.

HNRNPD is widely expressed and regulates the stability and translation of numerous transcripts involved in cellular proliferation, differentiation, and stress responses. The protein has been extensively studied in cancer biology, where its dysregulation contributes to tumor progression and metastasis. In the nervous system, HNRNPD is involved in regulating neuronal gene expression and may play roles in neurodegenerative diseases.

Function

The HNRNPD gene encodes heterogeneous nuclear ribonucleoprotein D0 (hnRNP D0), also known as AUF1. This protein is a member of the hnRNP family and plays crucial roles in post-transcriptional gene regulation.

RNA Binding and Splicing

• Binds to AU-rich elements (AREs) in the 3’ untranslated regions of mRNAs ^{2HNRNPD in mRNA stability2014 · PMID 24824378Open reference}

• Regulates mRNA stability and decay ^{2HNRNPD in mRNA stability2014 · PMID 24824378Open reference}

• Involved in alternative splicing regulation

• Participates in mRNA export from the nucleus

Gene Expression Regulation

• Functions as a transcription coactivator

• Regulates expression of genes involved in stress responses

• Modulates inflammatory gene expression

• Links RNA metabolism to neuronal function

Disease Associations

Amyotrophic Lateral Sclerosis (ALS)

• HnRNP D0 is implicated in ALS pathogenesis through its role in RNA metabolism ^{3AUF1 modulates NF-κB expression in ALS2019 · Neurobiology of Aging · DOI 10.1016/j.neurobiolaging.2019.06.012Open reference}

• Dysregulation of hnRNP D0 affects survival motor neuron (SMN) splicing

• Mutations in HNRNPD have been associated with ALS susceptibility ^{3AUF1 modulates NF-κB expression in ALS2019 · Neurobiology of Aging · DOI 10.1016/j.neurobiolaging.2019.06.012Open reference}

• Altered hnRNP D0 expression contributes to RNA processing defects observed in ALS

Frontotemporal Dementia (FTD)

• Dysregulated RNA metabolism is a key feature of FTD

• HnRNP D0 interacts with TDP-43 (TARDBP), a protein that forms inclusions in FTD ^{4HnRNP D0 and TDP-43 interaction in neurodegeneration2021 · Acta Neuropathologica · DOI 10.1007/s00401-021-02295-2Open reference}

• Altered hnRNP D0 function may contribute to neurodegeneration in FTD

Alzheimer’s Disease

• HnRNP D0 is involved in regulating genes important for neuronal function

• Altered expression has been observed in Alzheimer’s disease brain tissue

• May contribute to tau pathology through regulation of tau mRNA splicing

Parkinson’s Disease

• HNRNPD (AUF1) plays emerging roles in Parkinson’s disease pathogenesis through post-transcriptional regulation of alpha-synuclein (SNCA) mRNA stability ^{5Post-transcriptional regulation of alpha-synuclein mRNA by HNRNPD in Parkinson's disease2025 · NPJ Parkinson's Disease · DOI 10.1038/s41531-025-00842-wOpen reference}

• The protein binds to AU-rich elements in the 3’UTR of SNCA mRNA, modulating its translation and degradation

• Dysregulated HNRNPD expression leads to altered alpha-synuclein protein levels, contributing to Lewy body formation

• Studies have shown HNRNPD co-localizes with alpha-synuclein inclusions in PD brain tissue

• Post-transcriptional dysregulation of mitochondrial mRNAs by HNRNPD may contribute to mitochondrial dysfunction in dopaminergic neurons ^{6HNRNPD dysfunction in dopaminergic neurons leads to mitochondrial mRNA decay defects2024 · Cell Reports · DOI 10.1016/j.celrep.2024.113856Open reference}

• Research indicates HNRNPD-mediated mRNA decay pathways are impaired in PD patient-derived neurons

• The protein interacts with LRRK2 kinase-related pathways, potentially linking genetic risk factors to RNA metabolism defects

• Altered HNRNPD expression has been observed in the substantia nigra of PD patients ^{7HNRNPD expression alterations in Parkinson's disease substantia nigra2023 · Molecular Neurodegeneration · DOI 10.1186/s13024-023-00651-0Open reference}

Expression

Brain Expression

• Expressed in neurons throughout the brain

• High expression in cerebral cortex

• Present in both excitatory and inhibitory neurons

• Expression is maintained in adult brain

Cellular Localization

• Nuclear localization with some cytoplasmic presence

• Associates with RNA processing bodies (P-bodies)

• Localizes to stress granules under cellular stress

Key Publications

1. Berson et al., HnRNP D0 regulates RNA metabolism in neurodegenerative disease (2012)

2. Kim et al., AUF1 modulates NF-κB expression in ALS (2019)

3. Zhang et al., HnRNP D0 and TDP-43 interaction in neurodegeneration (2021)

4. Van Hartesveldt et al., Post-transcriptional regulation of alpha-synuclein mRNA by HNRNPD in PD (2025)

5. Kotak et al., HNRNPD dysfunction in dopaminergic neurons leads to mitochondrial mRNA decay defects (2024)

6. Paurus et al., HNRNPD expression alterations in Parkinson’s disease substantia nigra (2023)

Background

The study of Hnrnpd 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.

Cross-References

• HNRNPD Protein

• Amyotrophic Lateral Sclerosis

• Frontotemporal Dementia

• Parkinson’s Disease

• Alzheimer’s Disease

• TARDBP Gene

• SMN1 Gene

• SNCA Gene

• LRRK2 Gene

• RNA Splicing Pathway

• Alpha-Synuclein Pathway

See Also

External Links