Acetylation of \VGLL4\ Regulates Hippo-YAP Signaling and Postnatal Cardiac Growth


Lin Z, Guo H, Cao Y, Zohrabian S, Zhou P, Ma Q, VanDusen N, Guo Y, Zhang J, Stevens SM, Liang F, Quan Q, van Gorp P R, Li A, dos Remedios C, He A, Bezzerides V J, Pu W T. Acetylation of \VGLL4\ Regulates Hippo-YAP Signaling and Postnatal Cardiac Growth [Internet]. Developmental Cell 2016;39(4):466 - 479.


Summary Binding of the transcriptional co-activator \YAP\ with the transcription factor \TEAD\ stimulates growth of the heart and other organs. \YAP\ overexpression potently stimulates fetal cardiomyocyte (CM) proliferation, but YAP's mitogenic potency declines postnatally. While investigating factors that limit YAP's postnatal mitogenic activity, we found that the CM-enriched \TEAD1\ binding protein \VGLL4\ inhibits \CM\ proliferation by inhibiting TEAD1-YAP interaction and by targeting \TEAD1\ for degradation. Importantly, \VGLL4\ acetylation at lysine 225 negatively regulated its binding to TEAD1. This developmentally regulated acetylation event critically governs postnatal heart growth, since overexpression of an acetylation-refractory VGLL4 mutant enhanced \TEAD1\ degradation, limited neonatal \CM\ proliferation, and caused \CM\ necrosis. Our study defines an acetylation-mediated, VGLL4-dependent switch that regulates \TEAD\ stability and YAP-TEAD activity. These insights may improve targeted modulation of TEAD-YAP activity in applications from cardiac regeneration to cancer.