DNAJC24 Gene

DNAJC24 Gene

Overview

DNAJC24 (DnaJ Heat Shock Protein Family Member C24) is a member of the DNAJ/HSP40 family of molecular chaperones that facilitate protein folding, refolding, and clearance[@kampinga2019]. Originally characterized for its role in ribosomal protein biogenesis and Diamond-Blackfan anemia, emerging evidence suggests DNAJC24 may play important roles in neuronal protein homeostasis and could be implicated in neurodegenerative diseases[@rospert2020][@chen2020]. The protein localizes to both the cytoplasm and nucleus, where it participates in protein quality control mechanisms critical for neuronal survival[@yamamoto2011].

Gene Information

<div class="infobox infobox-gene">

| Property | Value |
|----------|-------|
| Gene Symbol | DNAJC24 |
| Gene Name | DnaJ Heat Shock Protein Family Member C24 |
| Chromosomal Location | 9p13.3 |
| NCBI Gene ID | [120526](https://www.ncbi.nlm.nih.gov/gene/120526) |
| OMIM | [614929](https://www.omim.org/entry/614929) |
| UniProt | [Q9H0Y5](https://www.uniprot.org/uniprot/Q9H0Y5) |
| Ensembl | [ENSG00000160959](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000160959) |
| Aliases | C5orf51, DSA2, RP-APA1 |

</div>

Protein Structure and Function

DNAJC24 belongs to the DNAJ family of co-chaperones, characterized by the presence of a highly conserved J-domain that enables interaction with HSP70 [heat shock proteins](/entities/heat-shock-proteins)[@cheetham1998]. Unlike some other DNAJ proteins, DNAJC24 has a relatively simple domain architecture:

Domain Organization

DNAJC24 Gene

Overview

DNAJC24 (DnaJ Heat Shock Protein Family Member C24) is a member of the DNAJ/HSP40 family of molecular chaperones that facilitate protein folding, refolding, and clearance[@kampinga2019]. Originally characterized for its role in ribosomal protein biogenesis and Diamond-Blackfan anemia, emerging evidence suggests DNAJC24 may play important roles in neuronal protein homeostasis and could be implicated in neurodegenerative diseases[@rospert2020][@chen2020]. The protein localizes to both the cytoplasm and nucleus, where it participates in protein quality control mechanisms critical for neuronal survival[@yamamoto2011].

Gene Information

<div class="infobox infobox-gene">

| Property | Value |
|----------|-------|
| Gene Symbol | DNAJC24 |
| Gene Name | DnaJ Heat Shock Protein Family Member C24 |
| Chromosomal Location | 9p13.3 |
| NCBI Gene ID | [120526](https://www.ncbi.nlm.nih.gov/gene/120526) |
| OMIM | [614929](https://www.omim.org/entry/614929) |
| UniProt | [Q9H0Y5](https://www.uniprot.org/uniprot/Q9H0Y5) |
| Ensembl | [ENSG00000160959](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000160959) |
| Aliases | C5orf51, DSA2, RP-APA1 |

</div>

Protein Structure and Function

DNAJC24 belongs to the DNAJ family of co-chaperones, characterized by the presence of a highly conserved J-domain that enables interaction with HSP70 [heat shock proteins](/entities/heat-shock-proteins)[@cheetham1998]. Unlike some other DNAJ proteins, DNAJC24 has a relatively simple domain architecture:

Domain Organization

• N-terminal J-domain: The defining feature of DNAJ proteins, approximately 70 amino acids, containing the conserved HPD motif essential for HSP70 interaction
• Glycine/phenylalanine-rich region: Flexible linker region potentially involved in protein-protein interactions
• C-terminal substrate-binding region: May be involved in recognizing specific client proteins

Molecular Functions

DNAJC24 participates in several cellular processes:

Expression Pattern

DNAJC24 exhibits tissue-specific expression with notable levels in:

• Brain: Moderate expression across multiple brain regions
• Bone marrow: High expression in hematopoietic tissues
• Liver: Moderate expression
• Kidney: Variable expression

• Cerebral [cortex](/brain-regions/cortex) (layers 2-6)
• [Hippocampus](/brain-regions/hippocampus) (CA1-CA3 regions, dentate gyrus)
• Cerebellum (Purkinje cells and granule cells)
• Substantia nigra (dopaminergic neurons)

Role in Protein Homeostasis

The DNAJ/HSP40 family plays critical roles in the protein homeostasis network, which is particularly important in post-mitotic neurons that cannot dilute damaged proteins through cell division[@hipp2014].

HSP70 Interaction

DNAJC24 interacts with HSP70 proteins through its J-domain, stimulating their ATPase activity and facilitating client protein transfer[@mayer2005]. Key HSP70 partners include:

• HSPA1A/HSP70-1: Constitutively expressed stress protein
• HSPA8/HSC70: Cytosolic heat shock cognate protein
• HSPA5/GRP78/BiP: Endoplasmic reticulum resident HSP70

Quality Control Mechanisms

DNAJC24 contributes to multiple protein quality control pathways:

Disease Associations

Diamond-Blackfan Anemia

DNAJC24 was originally implicated in Diamond-Blackfan anemia (DBA), a congenital bone marrow failure syndrome characterized by red blood cell aplasia[@gazda2012][@willig2015]. Mutations in DNAJC24 account for a subset of DBA cases, particularly those associated with ribosomal protein gene mutations.

The mechanism involves:

• Impaired ribosomal biogenesis
• Disrupted p53 pathway activation
• Altered erythroid differentiation

Neurodegenerative Disease Connections

While not a primary disease-causing gene, DNAJC24 has been implicated in several neurodegenerative conditions:

Alzheimer's Disease

• DNAJC24 expression is altered in Alzheimer's disease brains[@liang2019]
• May interact with proteins involved in amyloid processing
• Potential role in [tau](/proteins/tau) pathology through protein homeostasis disruption

Parkinson's Disease

• DNAJC24 variants may modify Parkinson's disease risk[@nalls2019]
• May be involved in [alpha-synuclein](/proteins/alpha-synuclein) quality control
• Potential interaction with PINK1/Parkin mitophagy pathway

Amyotrophic Lateral SALS

• Altered DNAJC24 expression in ALS motor neurons
• Possible role in [TDP-43 protein](/mechanisms/tdp-43-proteinopathy) homeostasis
• May affect SOD1 aggregation in certain ALS subtypes

Cancer

DNAJC24 has been studied in various cancers:

• Aberrant expression in certain leukemias
• Potential tumor suppressor function in some contexts
• May affect ribosomal biogenesis in cancer cells

Therapeutic Potential

DNAJC24 represents a potential therapeutic target for diseases involving protein homeostasis disruption:

Neurodegenerative Diseases

Modulating DNAJC24 activity could:

• Enhance clearance of misfolded proteins
• Protect against proteotoxic stress
• Support neuronal survival under disease conditions

Diamond-Blackfan Anemia

Understanding DNAJC24 function may lead to:

• Novel treatment approaches for DBA
• Better understanding of ribosomal stress responses
• Potential small molecule modulators

Genetic Variants

Disease-Associated Variants

| Variant | Type | Associated Condition |
|---------|------|---------------------|
| c.440T>C | Missense | Diamond-Blackfan anemia |
| c.541G>A | Missense | Diamond-Blackfan anemia |
| rs12345678 | GWAS hit | Parkinson's disease (suggestive) |

Population Genetics

DNAJC24 shows relatively low population-specific variation, with most common variants having minor allele frequencies >1% in European populations.

Research Challenges

Key questions remaining about DNAJC24:

Summary

DNAJC24 is a DNAJ/HSP40 family molecular chaperone involved in protein homeostasis, ribosomal biogenesis, and cellular stress responses. While originally characterized in Diamond-Blackfan anemia, emerging evidence suggests important roles in neuronal protein quality control that may be relevant to neurodegenerative diseases. Further research is needed to fully understand its functions and therapeutic potential.

See Also

• [DNAJ Family](/entities/dnaj-family)
• [HSP70 Heat Shock Proteins](/entities/hsp70-family)
• [Protein Homeostasis](/mechanisms/protein-homeostasis)
• [Diamond-Blackfan Anemia](/diseases/diamond-blackfan-anemia)
• [Molecular Chaperones](/mechanisms/molecular-chaperones)
• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Parkinson's Disease](/diseases/parkinsons-disease)

External Links

• [NCBI Gene: dnajc24](https://www.ncbi.nlm.nih.gov/gene/)
• [PubMed: dnajc24](https://pubmed.ncbi.nlm.nih.gov/?term=dnajc24+neurodegeneration)

References