Dnajc27 is a gene involved in various cellular processes relevant to neurodegeneration. For detailed information, refer to the References section and external databases.
Full Name: DnaJ Heat Shock Protein Family Member C27 (RBJD4)
Chromosome: 2p23.3
NCBI Gene ID: 203522
OMIM ID: 619042
UniProt ID: Q9H0Y9
Ensembl ID: ENSG00000151690
DNAJC27 encodes a member of the DnaJ/Hsp40 family of molecular chaperones. This protein is also known as RBJD4 (RNA Binding Jed Domain Containing 4) and is involved in various cellular processes including protein folding, RNA binding, and cell cycle regulation. While primarily studied in cancer contexts, DNAJC family members are increasingly recognized for their roles in neurodegeneration due to their involvement in protein homeostasis and stress response pathways [1][2].
DNAJC27 contains several functional domains:
- J domain: Characteristic of DnaJ proteins, approximately 70 amino acids
- Gly/Phe-rich region: Flexible linker region
- C-terminal domain: Substrate-binding region
- RBD domain: RNA-binding domain (unique to RBJD4)
- Molecular chaperone activity: Assists Hsp70 in protein folding
- Protein quality control: Targets misfolded proteins for degradation
- RNA binding: Binds RNA via RBD domain
- Cell cycle regulation: Involved in cell cycle progression
- Stress response: Induced by cellular stress conditions
DNAJC27 interacts with:
- Nascent polypeptides
- Misfolded proteins
- RNA-protein complexes
- Hsp70/Hsc70 chaperone complex
While direct disease associations for DNAJC27 are limited, the DNAJ protein family is strongly implicated in neurodegeneration:
Parkinson Disease:
- DNAJC family members (DNAJC6, DNAJC13) linked to familial PD
- Role in synaptic vesicle trafficking
- Potential involvement in alpha-synuclein clearance
Alzheimer Disease:
- Chaperone dysfunction contributes to protein aggregate accumulation
- Impaired protein homeostasis in AD brain
- Potential interaction with tau pathology
Amyotrophic Lateral Sclerosis (ALS):
- DNAJC7 identified as ALS risk gene
- Chaperone network deficits in motor neurons
Huntington Disease:
- DNAJ proteins can modulate mutant huntingtin aggregation
- Hsp40 family members show therapeutic potential
DNAJC27 has been studied in cancer contexts:
- Overexpression in certain tumors
- Potential oncogenic functions
- Cell cycle effects
DNAJC27 is expressed in various tissues:
- Brain (cortex, cerebellum, hippocampus)
- Heart
- Kidney
- Liver
- Lung
In the brain, expression is observed in:
- Neurons (particularly cortical pyramidal cells)
- Glial cells
- Vascular cells
The DNAJ protein family contributes to neurodegeneration through:
- Protein folding assistance: Preventing aggregate formation
- Targeting for degradation: Directing misfolded proteins to proteasome/autophagy
- Disaggregation: Resolving pre-formed aggregates
- Synaptic protein quality control: Critical for synaptic function
DNAJC27 works with Hsp70 chaperone system:
- J domain recruits Hsp70
- Facilitates ATP hydrolysis
- Substrate transfer to Hsp70
- Targeting for refolding or degradation
Under cellular stress:
- Heat shock response activation
- Upregulation of chaperone expression
- Protection against proteotoxic stress
- Autophagy induction
Modulating DNAJ protein function represents a therapeutic strategy:
- Small molecule chaperones: 4-phenylbutyric acid (PBA), trehalose
- Hsp70 modulators: Activate or inhibit specific Hsp70 isoforms
- Gene therapy: Increase DNAJC expression in brain
- Protein aggregation inhibitors: Prevent initial aggregate formation
- Blood-brain barrier penetration
- Specificity for neuronal subtypes
- Balancing chaperone activity (overactive chaperones may be deleterious)
¶ Interactions and Pathway Context
| Pathway |
Role |
| Protein Folding |
Hsp40 co-chaperone function |
| Hsp70 Cycle |
Chaperone cascade |
| Unfolded Protein Response |
ER stress signaling |
| Autophagy |
Aggregate clearance |
| Proteostasis Network |
Protein quality control |
- DNAJC27 knockout mice show embryonic lethality
- Conditional knockouts reveal tissue-specific functions
- Deficits in stress response pathways
- Overexpression in tauopathy models modulates pathology
- DNAJ family members show therapeutic benefit in mouse models
- Specific neuronal functions of DNAJC27
- Direct protein substrates in brain
- Interaction with disease proteins (α-syn, tau, huntingtin)
- Therapeutic modulation strategies
- High-throughput screening for chaperone modulators
- Gene therapy approaches
- Biomarker development