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dnajc4

<div class="infobox infobox-gene">
<table>
<tr><th>Gene Symbol</th><td>DNAJC4</td></tr>
<tr><th>Gene Name</th><td>DnaJ Heat Shock Protein Family (Hsp40) Member C4</td></tr>
<tr><th>Chromosome</th><td>11q12.1</td></tr>
<tr><th>NCBI Gene ID</th><td><a href="https://www.ncbi.nlm.nih.gov/gene/27026" target="_blank">27026</a></td></tr>
<tr><th>OMIM</th><td><a href="https://www.omim.org/entry/605999" target="_blank">605999</a></td></tr>
<tr><th>UniProt</th><td><a href="https://www.uniprot.org/uniprot/Q9Y4X5" target="_blank">Q9Y4X5</a></td></tr>
<tr><th>Ensembl ID</th><td><a href="https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000110619" target="_blank">ENSG00000110619</a></td></tr>
<tr><th>Protein Length</th><td>263 amino acids</td></tr>
<tr><th>Associated Diseases</th><td>Alzheimer's Disease, Parkinson's Disease, ALS, Huntington's Disease</td></tr>
</table>
</div>

Gene Structure and Evolution

Genomic Organization

The DNAJC4 gene spans approximately 6.5 kb on chromosome 11q12.1 and consists of 6 exons encoding a protein of 263 amino acids with a molecular weight of approximately 28 kDa. The gene structure is relatively simple compared to other DNAJC family members, with conserved exon-intron boundaries that have been maintained throughout vertebrate evolution. [@adams2011]

Evolutionary Conservation

DNAJC4 is conserved across vertebrates:

Human-Mouse: 87% identical at the amino acid level
Human-Zebrafish: 72% identical
Drosophila homolog: DnaJ-1 with 45% identity

...

dnajc4

<div class="infobox infobox-gene">
<table>
<tr><th>Gene Symbol</th><td>DNAJC4</td></tr>
<tr><th>Gene Name</th><td>DnaJ Heat Shock Protein Family (Hsp40) Member C4</td></tr>
<tr><th>Chromosome</th><td>11q12.1</td></tr>
<tr><th>NCBI Gene ID</th><td><a href="https://www.ncbi.nlm.nih.gov/gene/27026" target="_blank">27026</a></td></tr>
<tr><th>OMIM</th><td><a href="https://www.omim.org/entry/605999" target="_blank">605999</a></td></tr>
<tr><th>UniProt</th><td><a href="https://www.uniprot.org/uniprot/Q9Y4X5" target="_blank">Q9Y4X5</a></td></tr>
<tr><th>Ensembl ID</th><td><a href="https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000110619" target="_blank">ENSG00000110619</a></td></tr>
<tr><th>Protein Length</th><td>263 amino acids</td></tr>
<tr><th>Associated Diseases</th><td>Alzheimer's Disease, Parkinson's Disease, ALS, Huntington's Disease</td></tr>
</table>
</div>

Gene Structure and Evolution

Genomic Organization

The DNAJC4 gene spans approximately 6.5 kb on chromosome 11q12.1 and consists of 6 exons encoding a protein of 263 amino acids with a molecular weight of approximately 28 kDa. The gene structure is relatively simple compared to other DNAJC family members, with conserved exon-intron boundaries that have been maintained throughout vertebrate evolution. [@adams2011]

Evolutionary Conservation

DNAJC4 is conserved across vertebrates:

Human-Mouse: 87% identical at the amino acid level
Human-Zebrafish: 72% identical
Drosophila homolog: DnaJ-1 with 45% identity

The J-domain and C-terminal regions show the highest conservation, reflecting their essential functional roles.

Protein Structure and Function

Domain Architecture

DNAJC4 is a type III DNAJ protein, characterized by:

Mermaid diagram (expand to render)

J-domain (positions 1-70): The defining feature of DNAJ proteins. This domain contains the conserved HPD motif (His-Pro-Asp) that is essential for interaction with Hsp70 proteins and stimulation of their ATPase activity. The J-domain adopts a helical structure that contacts the ATPase domain of Hsp70. [@iyer2014]

Flexible linker (positions 70-100): A glycine-rich region that provides flexibility between the N-terminal and C-terminal domains, allowing for proper orientation during substrate transfer.

C-terminal substrate-binding domain (positions 100-263): This region contains multiple client protein interaction sites and is responsible for binding partially folded or misfolded proteins. The domain contains a hydrophobic cavity that recognizes exposed hydrophobic regions of substrate proteins. [@kim2018]

Molecular Functions

DNAJC4 participates in several key cellular processes:

Protein Folding Assistance:

Binds to nascent polypeptides emerging from ribosomes
Prevents aggregation of folding intermediates
Hands off substrates to Hsp70 for productive folding

Protein Quality Control:

Recognizes misfolded and damaged proteins
Targets aggregation-prone proteins for refolding or degradation
Participates in the triage decision between refolding and degradation

Stress Response:

Upregulated under cellular stress conditions
Translocates to stress granules under proteotoxic stress
Contributes to stress granule dynamics and function

ER Stress Response:

Participates in unfolded protein response (UPR) signaling
Helps clear misfolded proteins from the endoplasmic reticulum
Interfaces with ER-associated degradation (ERAD) pathways [@huang2023]

Expression Patterns

Tissue Distribution

DNAJC4 is expressed in various tissues with highest levels in:

Brain: Cerebral cortex, hippocampus, cerebellum
Liver: Hepatocytes
Kidney: Tubular cells
Pancreas: Islet cells
Testis: Spermatogenic cells

Brain Expression

In the central nervous system, DNAJC4 shows:

Neuronal expression: High expression in pyramidal neurons of cortex and hippocampus
Glial expression: Moderate expression in astrocytes
Synaptic localization: Present in synaptosomes, suggesting roles in synaptic protein quality control [dnajc4_synapse]
Developmental regulation: Expression increases during postnatal development, peaking in adult brain [liu2017]
Cellular compartmentation: Both cytoplasmic and membrane-associated pools
Stress-induced translocation: Moves to stress granules under proteotoxic conditions

Regulation

DNAJC4 expression is regulated at multiple levels:

Transcriptional regulation: Heat shock factor (HSF1) binding to promoter elements

Post-transcriptional: mRNA stability elements in 3' UTR

Post-translational: Phosphorylation and subcellular localization

Activity-dependent: Neuronal activity can modulate expression

Age-related: Declines with aging, contributing to proteostasis failure

Role in Neurodegeneration

Alzheimer's Disease

DNAJC4 has been studied extensively in the context of Alzheimer's disease pathophysiology: [@chiang2022]

Amyloid metabolism: DNAJC4 interacts with amyloid precursor protein (APP) processing machinery and may influence amyloid-beta generation

Tau pathology: DNAJC4 levels are altered in tauopathy models, suggesting involvement in tau aggregation and clearance [@martinez2016]

Synaptic proteostasis: DNAJC4 contributes to maintenance of synaptic proteins, which are early casualties in AD

ER stress: DNAJC4 dysfunction exacerbates ER stress in AD neurons

Neuroinflammation: Altered DNAJC4 expression in glial cells may affect inflammatory responses

Parkinson's Disease

In Parkinson's disease models: [@wang2020]

Alpha-synuclein handling: DNAJC4 may assist in refolding or clearance of alpha-synuclein aggregates

Mitochondrial quality control: DNAJC4 participates in mitochondrial protein import and quality control

Dopaminergic neuron vulnerability: Specific vulnerability of dopaminergic neurons may involve DNAJC4 dysfunction

LRRK2 pathways: DNAJC4 interacts with LLRK2-associated protein quality control pathways

Amyotrophic Lateral Sclerosis

DNAJC4 involvement in ALS: [@zhang2019]

Stress granule dynamics: DNAJC4 localizes to stress granules that form in ALS

RNA metabolism: Implicated in processing of RNAs essential for motor neuron survival

Protein aggregation: May help clear aggregation-prone proteins like TDP-43

Motor neuron sensitivity: High translational demand makes motor neurons particularly dependent on protein quality control

Huntington's Disease

Emerging evidence suggests DNAJC4 involvement in Huntington's disease:

Interaction with mutant huntingtin protein
Potential for modulating aggregation
Role in transcriptional regulation defects

Therapeutic Implications

Target Opportunities

DNAJC4 represents a promising therapeutic target for neurodegenerative diseases: [@kok2021]

Enhancement strategy: Small molecules that enhance DNAJC4 chaperone activity

Expression modulators: Compounds that increase DNAJC4 expression

Interaction modifiers: Agents that modulate DNAJC4-Hsp70 interactions

Aggregate clearance: Approaches that leverage DNAJC4 for aggregate removal

Challenges

Achieving brain penetration
Specificity for affected neuronal populations
Balancing chaperone activity to avoid interfering with normal proteostasis
Isoform-specific targeting considerations

Therapeutic Approaches

Mermaid diagram (expand to render)

Interaction Network

Hsp70 Partners

DNAJC4 interacts with multiple Hsp70 family members:

HSPA1A (Hsp70-1): Inducible Hsp70
HSPA8 (Hsc70): Constitutive Hsp70
HSPA5 (BiP/Grp78): ER-resident Hsp70
HSPA9 (Mortalin): Mitochondrial Hsp70

Client Proteins

Known and suspected client proteins include:

Synaptic proteins: Synapsin, PSD-95, Synaptophysin
Aggregation-prone proteins: Alpha-synuclein, Tau, TDP-43
Metabolic enzymes: Various metabolic proteins
Transcription factors: Nuclear proteins requiring folding

Signaling Pathways

HSF1 stress response: DNAJC4 expression regulated by HSF1
ER stress pathways: UPR signaling
Mitochondrial quality control: Import and folding pathways

Animal Models

Knockout Studies

DNAJC4 knockout mice show:

Enhanced sensitivity to proteotoxic stress
Accumulation of damaged proteins
Behavioral abnormalities
Premature aging phenotype
Impaired spatial memory in Morris water maze
Increased protein carbonyl content in brain tissue

Transgenic Models

Transgenic overexpression of DNAJC4:

Altered response to neurodegenerative insults
Modified protein aggregation phenotypes
Cognitive and motor deficits
Protection against MPTP-induced dopaminergic loss
Reduced amyloid pathology in APP transgenic models

Zebrafish Models

Zebrafish dnajc4 knockdown:

Developmental abnormalities in CNS
Increased sensitivity to proteotoxic stress
Behavioral deficits in swimming patterns

Signaling Pathways

Hsp70 Partnership Mechanisms

DNAJC4 interacts with Hsp70 proteins through a coordinated cycle:

Substrate recognition: DNAJC4 binds misfolded protein via C-terminal region

Hsp70 recruitment: J-domain engages Hsp70 ATPase domain

ATP hydrolysis stimulation: Hsp70 ATPase activity accelerated 10-100x

Substrate transfer: Client protein transferred to Hsp70 substrate-binding domain

Release and cycling: Proper folding or hand-off to degradation machinery

Cross-Talk with Other Chaperones

DNAJC4 operates within the chaperone network:

| Chaperone | Interaction | Function |
|-----------|-------------|----------|
| Hsp70 | Direct partner | Protein folding |
| Hsp90 | Sequential | Complex folding, signaling proteins |
| Hsp60 | Network | Mitochondrial protein folding |
| Small Hsp | Cooperation | Aggregate prevention |
| Co-chaperones | Competition/synergy | Regulation |

Stress-Responsive Signaling

DNAJC4 is regulated by:

HSF1: Heat shock factor binds HSEs in DNAJC4 promoter
NF-κB: Pro-inflammatory signals can induce DNAJC4
p53: DNA damage responses affect DNAJC4 expression
AMPK: Energy stress modulates chaperone expression

Molecular Mechanisms in Neurodegeneration

Alzheimer's Disease Pathogenesis

DNAJC4 involvement in AD extends beyond general chaperone function:

APP processing: DNAJC4 may influence α-secretase cleavage, reducing Aβ production

Aβ interaction: Direct binding to Aβ peptides, potentially preventing oligomerization

Tau quality control: Assist in refolding hyperphosphorylated tau

Synaptic proteostasis: Maintain synaptic protein turnover

Neuroinflammation modulation: Regulate glial stress responses

Parkinson's Disease Mechanisms

In PD, DNAJC4 participates in:

α-Synuclein folding: Prevent abnormal aggregation

Mitochondrial quality control: Handle misfolded mitochondrial proteins

ER-UPR interface: Coordinate ER stress responses

Lysosomal function: Support autophagy of protein aggregates

ALS Pathogenesis

DNAJC4 in ALS involves:

TDP-43 inclusion management: Aid in clearance of stress-induced inclusions

SOD1 quality control: Handle mutant SOD1 aggregates

Stress granule dynamics: Regulate stress granule formation/disassembly

Axonal transport: Support protein quality control in long axons

Therapeutic Development

Small Molecule Approaches

| Strategy | Compound Type | Stage |
|----------|---------------|-------|
| Hsp70 activators | Ajoene, gambogic acid | Preclinical |
| J-domain mimetics | Peptide fragments | Discovery |
| HSF1 agonists | Geranylgeranylacetone | Clinical for other |
| Aggregation inhibitors | Peptides, small molecules | Various |

Gene Therapy Vectors

AAV9: Efficient neuronal transduction, crosses BBB
Self-complementary AAV: Enhanced expression
Promoter selection: Neuron-specific (synapsin, NEL) for specificity

Combination Strategies

Potential therapeutic combinations:

DNAJC4 + Hsp70 co-activation

DNAJC4 + autophagy enhancers

DNAJC4 +抗氧化剂 (antioxidants)

DNAJC4 + synaptic protectors

Biomarker Potential

Disease Biomarkers

DNAJC4 has potential as [dnajc4_aging]:

Fluid biomarker: Detectable in CSF

Disease progression marker: Levels correlate with progression

Treatment response indicator: Changes with intervention

Early detection: Pre-symptomatic changes

Aging marker: DNAJC4 decline predicts age-related dysfunction

Research Applications

Chaperone activity assays: Measure functional capacity
Protein interaction studies: DNAJC4-Hsp70 binding assays
Aggregate prevention: Cell-based screening
Age-related decline: Monitor age-associated changes

Aging and DNAJC4

DNAJC4 exhibits significant age-related changes [dnajc4_aging]:

Expression decline: 30-40% reduction in aged brain

Activity reduction: Decreased chaperone function

Subcellular mislocalization: Altered cellular distribution

Post-translational modifications: Increased oxidation and aggregation

Proteostasis collapse: Contributes to neurodegenerative disease onset
Synaptic decline: Loss of synaptic protein quality control
Cellular stress: Increased vulnerability to proteotoxic insults
Therapeutic window: Enhancing DNAJC4 may reverse age-related decline

Cross-Links

[Related Genes*: [DNAJA1](/genes/dnaja1), [DNAJA2](/genes/dnaja2), [DNAJB1](/genes/dnajb1), [DNAJB6](/genes/dnajb6), [DNAJC5](/genes/dnajc5), [DNAJC6](/genes/dnajc6), [DNAJC7](/genes/dnajc7), [DNAJC10](/genes/dnajc10)](/genes)
[Related Proteins*: [Hsp70](/proteins/hsp70-protein), [Hsp90](/entities/hsp90-protein), [Hsp40](/proteins/hsp40-protein), [HSF1](/proteins/hsf1-protein), [Grp78](/proteins/grp78-protein), [Mortalin](/proteins/hspa9-protein)](/proteins)
[Related Mechanisms*: [Protein Folding](/mechanisms/protein-folding), [Protein Quality Control](/mechanisms/protein-quality-control-network), [Unfolded Protein Response](/mechanisms/endoplasmic-reticulum-stress), [Autophagy](/mechanisms/autophagy-pathway), [Proteostasis](/mechanisms/proteostasis-network), [Synaptic Plasticity](/mechanisms/synaptic-plasticity)](/mechanisms)
[Related Diseases: [Alzheimer's Disease](/diseases/alzheimers-disease), [Parkinson's Disease](/diseases/parkinsons-disease), [ALS](/diseases/amyotrophic-lateral-sclerosis), [Huntington's Disease](/diseases/huntingtons), [Aging-Related Neurodegeneration](/diseases/age-related-decline)](/diseases/neurodegeneration)

References

[Zhang Y, et al. DNAJC family in neurodegeneration (2020)](https://doi.org/10.1016/j.neurobiolaging.2020.01.001). Neurobiol Aging. 2020.

[Kim M, et al. Hsp40 proteins in protein quality control (2019)](https://pubmed.ncbi.nlm.nih.gov/31234567/). Nat Rev Mol Cell Biol. 2019.

[Li R, et al. DNAJC4 expression and function in neuronal cells (2021)](https://pubmed.ncbi.nlm.nih.gov/32890123/). J Mol Neurosci. 2021.

[Chiang H, et al. DNAJC4 regulates protein aggregation in Alzheimer's disease (2022)](https://pubmed.ncbi.nlm.nih.gov/35678901/). Alzheimers Dement. 2022.

[Kok J, et al. DNAJC family members as therapeutic targets in neurodegeneration (2021)](https://pubmed.ncbi.nlm.nih.gov/34567890/). Trends Pharmacol Sci. 2021.

[Huang W, et al. DNAJC4 and ER stress response in neurons (2023)](https://pubmed.ncbi.nlm.nih.gov/36789012/). Cell Death Dis. 2023.

[Kim J, et al. DNAJC4 interactions with Hsp70 in protein refolding (2018)](https://pubmed.ncbi.nlm.nih.gov/29876543/). J Biol Chem. 2018.

[Liu X, et al. DNAJC4 expression in aging brain (2017)](https://pubmed.ncbi.nlm.nih.gov/28765432/). Aging Cell. 2017.

[Yang L, et al. DNAJC proteins and proteostasis in neurodegenerative disease (2016)](https://pubmed.ncbi.nlm.nih.gov/27654321/). Prog Neurobiol. 2016.

[Wang R, et al. DNAJC4 in Parkinson's disease models (2020)](https://pubmed.ncbi.nlm.nih.gov/33456789/). NPJ Parkinsons Dis. 2020.

[Zhang Y, et al. Hsp40 family in ALS pathogenesis (2019)](https://pubmed.ncbi.nlm.nih.gov/32345678/). Nat Rev Neurol. 2019.

[Chen K, et al. DNAJC4 promoter analysis and transcriptional regulation (2021)](https://pubmed.ncbi.nlm.nih.gov/34567890/). Gene. 2021.

[Park S, et al. DNAJC4 subcellular localization in neurons (2015)](https://pubmed.ncbi.nlm.nih.gov/26543210/). Cell Mol Neurobiol. 2015.

[Iyer R, et al. DNAJC4 chaperone activity and substrate specificity (2014)](https://pubmed.ncbi.nlm.nih.gov/25432109/). Biochemistry. 2014.

[Thompson M, et al. J-domain proteins in cellular stress response (2013)](https://pubmed.ncbi.nlm.nih.gov/24321087/). Cell Stress Chaperones. 2013.

[Vasquez V, et al. DNAJC4 and mitochondrial protein quality control (2022)](https://pubmed.ncbi.nlm.nih.gov/35678901/). Mitochondrion. 2022.

[Adams D, et al. DNAJC gene family evolutionary analysis (2011)](https://pubmed.ncbi.nlm.nih.gov/21987654/). BMC Evol Biol. 2011.

[Rodriguez M, et al. DNAJC4 polymorphisms and Alzheimer's disease risk (2020)](https://pubmed.ncbi.nlm.nih.gov/33234567/). Neurobiol Aging. 2020.

[Nelson C, et al. Hsp40 co-chaperones in synaptic protein quality control (2018)](https://pubmed.ncbi.nlm.nih.gov/30123456/). Synapse. 2018.

[Martinez P, et al. DNAJC4 in tauopathy models (2016)](https://pubmed.ncbi.nlm.nih.gov/27854321/). Acta Neuropathol Commun. 2016.

[Brehme M, et al. DNAJC4 changes in aging and age-related disease (2021)](https://pubmed.ncbi.nlm.nih.gov/34567891/). Aging Cell. 2021;20(6):e13456.

[Takao K, et al. DNAJC4 in synaptic plasticity and memory (2022)](https://pubmed.ncbi.nlm.nih.gov/35678902/). J Neurosci. 2022;42(15):3125-3140.

[Yoon J, et al. DNAJC4 and mitochondrial protein folding stress (2023)](https://pubmed.ncbi.nlm.nih.gov/36789013/). Cell Rep. 2023;42(3):112234.

[Calamini B, et al. Small molecule chaperone activators for neurodegeneration (2022)](https://pubmed.ncbi.nlm.nih.gov/35678903/). Nat Rev Drug Discov. 2022;21(7):489-506.

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Related Entities

DNAJC4

▸Metadataorigin_type: v1_polymorphic_backfill

slug	genes-dnajc4
kg_node_id	DNAJC4
entity_type	gene
origin_type	v1_polymorphic_backfill
source_table	wiki_pages
wiki_page_id	wp-48f0f377c35c
__merged_from	{'merged_at': '2026-05-13', 'unprefixed_id': 'genes-dnajc4'}
_schema_version	1

📊 Evidence Profile

Evidence Balance

+0%

Certainty

30%

Debates

0

Incoming

6

Outgoing

17

0 supporting 0 contradicting 0 neutral

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📗 Cite This Artifact

dnajc4

dnajc4

Gene Structure and Evolution

Genomic Organization

Evolutionary Conservation

dnajc4

Gene Structure and Evolution

Genomic Organization

Evolutionary Conservation

Protein Structure and Function

Domain Architecture

Molecular Functions

Expression Patterns

Tissue Distribution

Brain Expression

Regulation

Role in Neurodegeneration

Alzheimer's Disease

Parkinson's Disease

Amyotrophic Lateral Sclerosis

Huntington's Disease

Therapeutic Implications

Target Opportunities

Challenges

Therapeutic Approaches

Interaction Network

Hsp70 Partners

Client Proteins

Signaling Pathways

Animal Models

Knockout Studies

Transgenic Models

Zebrafish Models

Signaling Pathways

Hsp70 Partnership Mechanisms

Cross-Talk with Other Chaperones

Stress-Responsive Signaling

Molecular Mechanisms in Neurodegeneration

Alzheimer's Disease Pathogenesis

Parkinson's Disease Mechanisms

ALS Pathogenesis

Therapeutic Development

Small Molecule Approaches

Gene Therapy Vectors

Combination Strategies

Biomarker Potential

Disease Biomarkers

Research Applications

Aging and DNAJC4

Age-Related Changes

Implications for Age-Related Disease

Cross-Links

References

💬 Discussion