DNAJC28 (DnaJ Heat Shock Protein Family Member C28) is a testis-specific molecular chaperone belonging to the DNAJ/Hsp40 family. While functionally characterized to a limited extent, this gene encodes a protein containing the conserved J-domain characteristic of DNAJ chaperones, which function as co-chaperones with Hsp70 proteins to facilitate protein folding, refolding, and clearance of misfolded proteins.
| Property | Value |
|---|---|
| Gene Symbol | DNAJC28 |
| Gene Name | DnaJ Heat Shock Protein Family Member C28 |
| Chromosomal Location | 21q22.11 |
| NCBI Gene ID | 254268 |
| OMIM | 619044 |
| UniProt | Q9H0Z2 |
| Ensembl ID | ENSG00000178104 |
| Aliases | C21orf91, DJC28 |
DNAJC28 encodes a protein containing the highly conserved J-domain typical of DNAJ family members. The J-domain serves as the interaction surface with Hsp70/DnaK chaperones, recruiting them to substrates that require folding assistance or degradation. While DNAJC28 is considered testis-specific in expression, its precise biological functions remain incompletely characterized.
DNAJ proteins broadly function in:
The testis-specific expression pattern suggests potential roles in spermatogenesis, where extensive protein remodeling occurs during sperm development. DNAJC28 may assist in the proper folding of proteins required for sperm motility, viability, or fertilization capacity.
Current evidence does not strongly associate DNAJC28 directly with neurodegenerative diseases. However, the broader DNAJC family has been implicated in various neurological conditions:
DNAJC28 demonstrates testis-specific expression with minimal expression in other tissues. During spermatogenesis, expression may be regulated to support the specialized protein folding requirements of developing germ cells. The protein localizes to various cellular compartments where chaperone activity is needed.