Hydrostatic pressure regulates neural crest competence through Yap signaling. Neural crest cells, a key embryonic cell population, require competence to respond to inductive signals for proper development. This study shows that increased hydrostatic pressure in the blastocoel cavity reduces neural crest competence by inhibiting Yap signaling and impairing Wnt activation, which is essential for neural crest induction. The findings demonstrate that hydrostatic pressure controls neural crest induction in amphibian, mouse, and human cells, suggesting a conserved mechanism across vertebrates. The research reveals that mechanical cues, specifically hydrostatic pressure, interact with signaling pathways to regulate embryonic competence. Yap, a mechanosensor, modulates Wnt signaling by controlling β-catenin nuclear translocation, which is crucial for neural crest induction. The study highlights that changes in hydrostatic pressure during development affect Yap activity, leading to the loss of neural crest competence. The results indicate that Yap's nuclear localization is essential for Wnt signaling and neural crest induction, and that hydrostatic pressure influences this process by altering cell packing and Yap localization. The findings underscore the role of mechanical cues in embryonic development and provide insights into the regulation of neural crest competence through Yap and Wnt signaling.Hydrostatic pressure regulates neural crest competence through Yap signaling. Neural crest cells, a key embryonic cell population, require competence to respond to inductive signals for proper development. This study shows that increased hydrostatic pressure in the blastocoel cavity reduces neural crest competence by inhibiting Yap signaling and impairing Wnt activation, which is essential for neural crest induction. The findings demonstrate that hydrostatic pressure controls neural crest induction in amphibian, mouse, and human cells, suggesting a conserved mechanism across vertebrates. The research reveals that mechanical cues, specifically hydrostatic pressure, interact with signaling pathways to regulate embryonic competence. Yap, a mechanosensor, modulates Wnt signaling by controlling β-catenin nuclear translocation, which is crucial for neural crest induction. The study highlights that changes in hydrostatic pressure during development affect Yap activity, leading to the loss of neural crest competence. The results indicate that Yap's nuclear localization is essential for Wnt signaling and neural crest induction, and that hydrostatic pressure influences this process by altering cell packing and Yap localization. The findings underscore the role of mechanical cues in embryonic development and provide insights into the regulation of neural crest competence through Yap and Wnt signaling.