DNAJC1 is a DnaJ heat shock protein family member (Hsp40) that functions as a molecular chaperone with diverse biological roles. The protein appears to have oncogenic properties, as it regulates proliferation and migration in hepatocellular carcinoma through p53 and epithelial-mesenchymal transition (EMT) signaling pathways 1. In glioblastoma, DNAJC1 facilitates tumor progression by promoting extracellular matrix reorganization and immunosuppressive macrophage infiltration 2. Importantly, DNAJC1 mutations are associated with severe developmental disorders, as demonstrated by a canine model where SINE insertion in DNAJC1 causes syndromic congenital microphthalmia with hematopoietic defects, including thrombocytopenia and growth stunting 3. The protein shows tissue-specific expression patterns and has been implicated in various cellular processes including wound healing, cell adhesion, and innate immune response through differential methylation patterns in periodontal inflammation 4. DNAJC1 also functions in preventing endoplasmic reticulum stress-mediated pancreatic β-cell apoptosis in type 2 diabetes 5. Additionally, genome-wide association studies have linked DNAJC1 loci to abdominal fat distribution, particularly subcutaneous adipose tissue in women 6.