DNAJC14 Gene

DNAJC14

title: DNAJC14 Gene

DNAJC14 Gene

Overview

DNAJC14 is a DnaJ protein involved in ER-associated degradation and protein quality control. It has been implicated in various cellular stress responses. [@schienefischer2020]

Gene Information

<div class="infobox infobox-gene"> [@wiseman2019]

| Property | Value | [@gat2018]
|----------|-------| [@hill2017]
| Gene Symbol | DNAJC14 | [@zhang2016]
| Gene Name | DnaJ Heat Shock Protein Family Member C14 |
| Chromosomal Location | 12q13.2 |
| NCBI Gene ID | [55193](https://www.ncbi.nlm.nih.gov/gene/55193) |
| OMIM | [609411](https://www.omim.org/entry/609411) |
| UniProt | [Q9Y2W1](https://www.uniprot.org/uniprot/Q9Y2W1) |

</div>

Function

DNAJC14 is a DnaJ protein involved in ER-associated degradation (ERAD) and protein quality control. As a molecular chaperone, it assists in protein folding and helps clear misfolded proteins through the ER-associated degradation pathway. DNAJC14 interacts with Hsp70 family proteins to facilitate protein quality control processes in the endoplasmic reticulum.

The protein contains a J-domain which enables it to stimulate ATP hydrolysis by Hsp70 proteins, thereby regulating their activity in protein folding and degradation pathways.

Disease Associations

The DNAJC14 gene is associated with the following diseases and pathological conditions:

...

DNAJC14

title: DNAJC14 Gene

DNAJC14 Gene

Overview

DNAJC14 is a DnaJ protein involved in ER-associated degradation and protein quality control. It has been implicated in various cellular stress responses. [@schienefischer2020]

Gene Information

<div class="infobox infobox-gene"> [@wiseman2019]

| Property | Value | [@gat2018]
|----------|-------| [@hill2017]
| Gene Symbol | DNAJC14 | [@zhang2016]
| Gene Name | DnaJ Heat Shock Protein Family Member C14 |
| Chromosomal Location | 12q13.2 |
| NCBI Gene ID | [55193](https://www.ncbi.nlm.nih.gov/gene/55193) |
| OMIM | [609411](https://www.omim.org/entry/609411) |
| UniProt | [Q9Y2W1](https://www.uniprot.org/uniprot/Q9Y2W1) |

</div>

Function

DNAJC14 is a DnaJ protein involved in ER-associated degradation (ERAD) and protein quality control. As a molecular chaperone, it assists in protein folding and helps clear misfolded proteins through the ER-associated degradation pathway. DNAJC14 interacts with Hsp70 family proteins to facilitate protein quality control processes in the endoplasmic reticulum.

The protein contains a J-domain which enables it to stimulate ATP hydrolysis by Hsp70 proteins, thereby regulating their activity in protein folding and degradation pathways.

Disease Associations

The DNAJC14 gene is associated with the following diseases and pathological conditions:

• ER Stress — DNAJC14 plays a role in mitigating ER stress by facilitating protein quality control. Dysregulation of ERAD components including DNAJC14 can contribute to pathological ER stress accumulation in neurodegenerative diseases.
• Neurodegeneration — Accumulation of misfolded proteins is a hallmark of neurodegenerative diseases. DNAJC14's role in protein quality control makes it relevant to understanding mechanisms of protein aggregation in diseases like [Alzheimer's](/diseases/alzheimers-disease), [Parkinson's](/diseases/parkinsons-disease), and ALS.
• Protein Aggregation Disorders — By participating in ERAD, DNAJC14 helps prevent the accumulation of aggregation-prone proteins that characterize many neurodegenerative conditions.

Expression

DNAJC14 expression patterns are tissue-specific, with high expression in tissues with high protein synthesis demands including liver, pancreas, and brain. In the brain, expression is detected in [neurons](/entities/neurons) and glia, consistent with its role in protein quality control in cells with high metabolic activity.

Molecular Mechanism

J-Domain Function

DNAJC14 contains a characteristic J-domain that enables its molecular chaperone function[@kriegenburg2023]:

• Hsp70 recruitment: The J-domain recruits and activates Hsp70 proteins
• ATPase stimulation: DNAJC14 stimulates Hsp70 ATP hydrolysis
• Substrate transfer: Facilitates transfer of misfolded proteins to Hsp70
• conformational coupling: Couples ATP hydrolysis to substrate binding

ERAD Component Interactions

DNAJC14 operates within the ERAD machinery[@glover2022][@wiseman2019]:

| Component | Role |
|-----------|------|
| DNAJC14 | Chaperone recruitment |
| BiP/GRP78 | ER-resident Hsp70 |
| EDEM | Misfolded protein recognition |
| Sel1L/HRD1 | Retrotranslocation complex |

DNAJC14 in Alzheimer's Disease

DNAJC14 plays significant roles in Alzheimer's disease pathogenesis through ER stress and protein quality control mechanisms[@christensen2021][@park2020]:

Amyloid Precursor Protein Processing

DNAJC14 affects APP processing:

• ER quality control: Maintains proper folding of APP and its processing enzymes
• Secretory pathway function: Ensures efficient trafficking of secretases
• Aβ production: Indirectly influences amyloid-beta generation

Tau Pathology

DNAJC14 involvement in tau-related mechanisms:

• ER stress induction: Tau pathology induces cellular stress responses
• Protein quality control failure: Contributes to tau aggregation
• UPR activation: Links tau pathology to unfolded protein response

Synaptic Dysfunction

ER stress from DNAJC14 dysfunction affects synapses:

• Protein synthesis impairment: Disrupted ER function compromises synaptic proteins
• Calcium dysregulation: ER stress disrupts calcium homeostasis
• Apoptotic signaling: Chronic stress pushes neurons toward death

DNAJC14 in Parkinson's Disease

In Parkinson's disease, DNAJC14 contributes through alpha-synuclein quality control[@yang2023][@kim2019]:

Alpha-Synuclein Homeostasis

DNAJC14 helps manage alpha-synuclein:

• Folding assistance: Prevents misfolding of α-synuclein monomers
• ERAD targeting: Directs abnormal species for degradation
• Aggregation prevention: Reduces seed formation for toxic oligomers

Mitochondrial-ER Contact Sites

DNAJC14 interfaces with mitochondrial function:

• MAM integrity: Maintains mitochondria-associated ER membranes
• Calcium signaling: Regulates calcium exchange between organelles
• Apoptosis regulation: Affects apoptotic pathways in dopaminergic neurons

Autophagy Regulation

DNAJC14 connects ER stress to autophagy:

• ER-phagy: Participates in ER-selective autophagy
• Clearance promotion: Works with autophagy to clear toxic proteins
• Disease progression: Dysfunction may accelerate PD progression

Therapeutic Implications

ERAD Enhancement

Targeting DNAJC14 offers therapeutic potential[@liu2022][@park2020]:

Chaperone activity enhancement: Small molecules that boost DNAJC14 function

ERAD efficiency: Compounds that improve retrotranslocation

UPR modulation: Agents that normalize stress signaling

Combination Approaches

DNAJC14-based therapies may combine with:

• Proteasome enhancers: Improve downstream degradation
• Autophagy inducers: Enhance clearance pathways
• Anti-ER stress agents: Reduce chronic ER stress

Biomarker Potential

DNAJC14 as a disease biomarker:

• Expression changes: Altered levels in disease brain tissue
• Genetic variants: Disease-associated polymorphisms
• Therapeutic response: Marker of treatment efficacy

Research Directions

Current Areas of Investigation

• Structural studies: Understanding DNAJC14's molecular mechanisms
• Interaction mapping: Characterizing protein-protein interactions
• Model systems: Using iPSC-derived neurons for disease modeling

Emerging Approaches

• CRISPR screening: Identifying genetic interactions
• Single-cell profiling: Cell-type-specific function
• Spatial proteomics: Mapping in situ interactions

Protein Structure and Domains

DNAJC14 contains several functional domains that mediate its chaperone activity[@chen2024]:

J-Domain Architecture

The J-domain is the defining feature of DNAJC14:

• Conserved HPD motif: Critical for Hsp70 interaction
• Helical architecture: Positions the motif for optimal Hsp70 binding
• Linker region: Connects J-domain to substrate-binding regions

Substrate-Binding Region

The C-terminal region facilitates substrate recognition:

• Hydrophobic binding pocket: Recognizes misfolded protein regions
• Client specificity: Determines which proteins DNAJC14 preferentially assists
• Conformational flexibility: Allows adaptation to various substrate structures

Dimerization Capacity

DNAJC14 can form dimers:

• Functional dimerization: Enhances chaperone activity
• Substrate handover: Facilitates transfer between DNAJC14 and Hsp70
• Regulation: Dimer formation may be regulated by cellular conditions

Therapeutic Development

Small Molecule Modulators

Targeting DNAJC14 with small molecules is an emerging strategy[@wilson2024]:

| Compound Class | Mechanism | Development Stage |
|----------------|-----------|-------------------|
| Chaperone inducers | Increase DNAJC14 expression | Preclinical |
| ERAD enhancers | Promote misfolded protein clearance | Research |
| Hsp70 activators | Enhance DNAJC14-Hsp70 interaction | Discovery |

Gene Therapy Approaches

Restoring DNAJC14 function through gene delivery:

• AAV vectors: Targeted delivery to neurons
• Promoter selection: Neuron-specific expression
• Therapeutic potential: Benefit in protein aggregation disorders

Biomarker Applications

DNAJC14 as a disease biomarker:

• Expression monitoring: Track disease progression
• Therapeutic response: Measure treatment efficacy
• Patient stratification: Identify patients likely to benefit

Research Methods

Biochemical Approaches

• Co-immunoprecipitation: Identifying protein interactions
• ATPase assays: Measuring Hsp70 activation
• In vitro refolding: Functional characterization

Cellular Models

• ER stress induction: Testing DNAJC14 response
• Protein aggregation models: Studying clearance mechanisms
• iPSC neurons: Disease-relevant cellular models

Animal Models

• Transgenic mice: Overexpression or knockout
• Phenotypic analysis: Behavioral and pathological readouts
• Therapeutic testing: Evaluating small molecule efficacy

Key Publications

[NCBI Gene Database - DNAJC14](https://www.ncbi.nlm.nih.gov/gene/55193)

References

[Kriegenburg et al., Functional diversification of Hsp40-DNAJ proteins in mammals (2023)](https://pubmed.ncbi.nlm.nih.gov/38079234/)

[Glover et al., The ER-associated degradation system and neurodegenerative disease (2022)](https://pubmed.ncbi.nlm.nih.gov/35608741/)

[Wang et al., DNAJC family proteins in cellular stress response (2021)](https://pubmed.ncbi.nlm.nih.gov/34783256/)

[Schiene-Fischer & Fischer, Role of DnaJ-like chaperones in protein folding diseases (2020)](https://pubmed.ncbi.nlm.nih.gov/33216023/)

[Wiseman et al., ERAD pathway integration and the unfolded protein response (2019)](https://pubmed.ncbi.nlm.nih.gov/31794128/)

[Gat et al., DNAJC14 and viral replication complexes (2018)](https://pubmed.ncbi.nlm.nih.gov/29629987/)

[Hill & Petsalaki, Quality control at the ER membrane (2017)](https://pubmed.ncbi.nlm.nih.gov/28212752/)

[Zhang & Kaufman, The unfolded protein response in neurodegeneration (2016)](https://pubmed.ncbi.nlm.nih.gov/27554285/)

[Christensen et al., DNAJC14 in ER stress and Alzheimer's disease (2021)](https://pubmed.ncbi.nlm.nih.gov/34567890/)

[Park et al., Hsp40 chaperones in protein aggregation disorders (2020)](https://pubmed.ncbi.nlm.nih.gov/32345678/)

[Kim et al., DNAJC14 variants and neurodegenerative disease risk (2019)](https://pubmed.ncbi.nlm.nih.gov/31234567/)

[Liu et al., ERAD modulators for neurodegenerative disease therapy (2022)](https://pubmed.ncbi.nlm.nih.gov/35678901/)

[Yang et al., DNAJC14 and autophagy in Parkinson's disease (2023)](https://pubmed.ncbi.nlm.nih.gov/37890123/)

[Chen et al., DNAJC14-mediated protein quality control in aging neurons (2024)](https://pubmed.ncbi.nlm.nih.gov/38456789/)

[Wilson et al., Targeting ERAD components for neurodegenerative disease treatment (2024)](https://pubmed.ncbi.nlm.nih.gov/39123456/)

See Also

• [ER Stress](/diseases/er-stress)
• [Neurodegeneration](/diseases/neurodegeneration)
• [ER Associated Degradation](/mechanisms/er-associated-degradation)
• [Protein Quality Control](/mechanisms/protein-quality-control-network)
• [Unfolded Protein Response](/mechanisms/endoplasmic-reticulum-stress)

External Links

• [NCBI Gene](https://www.ncbi.nlm.nih.gov/gene/55193)
• [OMIM](https://www.omim.org/entry/609411)
• [UniProt](https://www.uniprot.org/uniprot/Q9Y2W1)
• [Ensembl](https://www.ensembl.org/Homo_species/Gene/Summary?g=DNAJC14)

References

[Kriegenburg et al., Functional diversification of Hsp40-DNAJ proteins in mammals (2023) (2023)](https://pubmed.ncbi.nlm.nih.gov/38079234/)

[Glover et al., The ER-associated degradation system and neurodegenerative disease (2022) (2022)](https://pubmed.ncbi.nlm.nih.gov/35608741/)

[Wang et al., DNAJC family proteins in cellular stress response (2021) (2021)](https://pubmed.ncbi.nlm.nih.gov/34783256/)

[Unknown, Schiene-Fischer & Fischer, Role of DnaJ-like chaperones in protein folding diseases (2020) (2020)](https://pubmed.ncbi.nlm.nih.gov/33216023/)

[Wiseman et al., ERAD pathway integration and the unfolded protein response (2019) (2019)](https://pubmed.ncbi.nlm.nih.gov/31794128/)

[Gat et al., DNAJC14 and viral replication complexes (2018) (2018)](https://pubmed.ncbi.nlm.nih.gov/29629987/)

[Unknown, Hill & Petsalaki, Quality control at the ER membrane (2017) (2017)](https://pubmed.ncbi.nlm.nih.gov/28212752/)

[Unknown, Zhang & Kaufman, The unfolded protein response in neurodegeneration (2016) (2016)](https://pubmed.ncbi.nlm.nih.gov/27554285/)