CHD7 encodes an ATP-dependent chr8 remodeling protein that slides nucleosomes along DNA and regulates gene transcription 1. The protein functions as a chr8 helicase that participates in chr8 remodeling and transcriptional regulation 2. CHD7 plays critical roles in early embryonic development, particularly in definitive endodermal and mesodermal development from embryonic stem cells 3. In inner ear development, CHD7 acts in a gene regulatory network with SOX2, binding at transcription start sites and enhancers to control expression of key developmental genes including Pax2 and Otx2 4. During cardiac development, CHD7 is required for atrioventricular cushion development, outflow tract septation, and great vessel formation, working in concert with transcription factors like TBX1 and SMADs to regulate genes such as p53 and NKX2.5 5. Loss-of-function mutations in CHD7 cause CHARGE syndrome, a complex multi-system disorder affecting over 75% of patients with this condition 6. The syndrome includes coloboma, heart defects, choanal atresia, growth retardation, genital hypoplasia, and ear anomalies 7. CHD7 mutations are also associated with idiopathic hypogonadotropic hypogonadism and Kallmann syndrome 2.