CHURC1 (churchill domain containing 1) is a transcriptional regulator that does not bind DNA directly 1 but functions through protein-protein interactions in fibroblast growth factor signaling pathways. The gene exhibits significant SNP-based heritability (h² = 0.27) in breast tissue 2 and represents one of the most predictable genes across diverse populations, with expression levels showing strong genetic control in multiple tissues including endometrium, adipose, and pancreatic islets 345. CHURC1 expression is dynamically regulated by body mass index interactions in adipose tissue 6, suggesting roles in metabolic regulation. Clinically, CHURC1 has emerged as a candidate gene in capecitabine-induced hand-foot syndrome through genotype-expression associations in skin tissue 1, linking genetic variation to chemotherapy toxicity. Additionally, CHURC1 appears relevant to cystic fibrosis pathogenesis, as its knockdown partially restores CFTR-dependent chloride transport in ΔF508-CFTR cells 7, and expression is reduced in severe preeclampsia 8. These findings indicate CHURC1 functions in tissue-specific transcriptional regulation with implications for metabolic, pharmacogenomic, and reproductive pathophysiology.