Pengfei Lu, Ping Wang, Bingruo Wu, Yidong Wang, Yang Liu, Wei Cheng, Xuhui Feng, Xinchun Yuan, Miriam M Atteya, Haleigh Ferro, Yukiko Sugi, Grant Rydquist, Mahdi Esmaily, Jonathan T Butcher, Ching-Pin Chang, Jack Lenz, Deyou Zheng, Bin Zhou
Developmental etiologies causing complex congenital aortic root abnormalities are unknown. Here we show that deletion of Sox17 in aortic root endothelium in mice causes underdeveloped aortic root leading to a bicuspid aortic valve due to the absence of non-coronary leaflet and mispositioned left coronary ostium. The respective defects are associated with reduced proliferation of non-coronary leaflet mesenchyme and aortic root smooth muscle derived from the second heart field cardiomyocytes. Mechanistically, SOX17 occupies a Pdgfb transcriptional enhancer to promote its transcription and Sox17 deletion inhibits the endothelial Pdgfb transcription and PDGFB growth signaling to the non-coronary leaflet mesenchyme...
July 13, 2022: Nature Communications