DNAJC27 is a heat shock protein family member (Hsp40) with GTPase activity that functions as a molecular chaperone in cellular proteostasis. The gene encodes a J domain protein that can activate the MEK/ERK pathway and acts as a nuclear scaffold for MAPK1, enhancing ERK1/ERK2 signaling when overexpressed 1. DNAJC27 plays a role in histone chaperoning and ciliogenesis, with its J domain being essential for functional specificity 1. Regarding disease relevance, DNAJC27 has been implicated in multiple conditions. Genetic variants in DNAJC27, particularly rs713586, are associated with obesity susceptibility in both adults and preschool children, though evidence suggests the primary obesity risk mechanism may involve dysregulation of ADCY3 rather than DNAJC27 itself 2 3 4. DNAJC27 expression is elevated in obesity and may regulate appetite through modulation of MC4R-mediated cAMP signaling 2. Additionally, DNAJC27 variants show bidirectional causal associations with inflammatory bowel disease and psoriasis, suggesting involvement in immune-mediated pathology 5. The gene also demonstrates suggestive associations with Parkinson's disease in multiple subgroups 6, and height-associated variants near DNAJC27 are linked to hormone receptor-positive breast cancer risk 7.