CFC1 (cryptic, EGF-CRC family member 1) functions as a NODAL coreceptor essential for establishing proper left-right axis determination during embryonic development. The protein plays a critical role in NODAL signaling pathways that control mesoderm and neural patterning during gastrulation. CFC1 mutations have been identified as causes of ventricular septal defects (VSDs), one of the most common congenital heart diseases 1. The gene is particularly associated with heterotaxy syndromes, where patients exhibit abnormal left-right body asymmetry affecting multiple organ systems. While CFC1 itself is not directly part of the RAS-MAPK pathway, it functions alongside other signaling molecules that contribute to cardiac development 1. Mutations in CFC1 represent part of the broader genetic heterogeneity observed in congenital heart defects, particularly those involving transcription factors and signaling molecules critical for cardiac morphogenesis. The clinical significance of CFC1 mutations extends beyond isolated cardiac malformations, as they can cause complex syndromic presentations involving multiple organ systems. However, the provided abstracts contain limited specific mechanistic details about CFC1's molecular function, focusing primarily on RASopathies rather than CFC1-specific pathways.