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We previously reported that the GNAQ R183Q somatic mutation was located in the SWS episclera. However, the mechanism by which GNAQ R183Q leads to episcleral vascular malformation remains poorly understood. In this study, we investigated the correlation between GNAQ R183Q and episcleral vascular malformation via surgical specimens, human umbilical vein endothelial cells (HUVECs), and the HUVEC cell line EA.hy926. Our findings demonstrated a positive correlation between episcleral vessel diameter and the frequency of the GNAQ R183Q variant. Furthermore, the upregulation of genes from the Notch signaling pathway and abnormal coexpression of the arterial marker EphrinB2 and venous marker EphB4 were demonstrated in the scleral vasculature of SWS. Analysis of HUVECs overexpressing GNAQ R183Q in vitro confirmed the upregulation of Notch signaling and arterial markers. In addition, knocking down of Notch1 diminished the upregulation of arterial markers induced by GNAQ R183Q. Our findings strongly suggest that GNAQ R183Q leads to malformed episcleral vasculatures through Notch\u2010induced aberrant arteriovenous specification. These insights into the molecular basis of episcleral vascular malformation will provide new pathways for the development of effective treatments for SWS secondary glaucoma.<\/jats:p>","DOI":"10.1096\/fj.202300608r","type":"journal-article","created":{"date-parts":[[2023,8,22]],"date-time":"2023-08-22T09:51:37Z","timestamp":1692697897000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["<scp>GNAQ R183Q<\/scp>\n                    somatic mutation contributes to aberrant arteriovenous specification in\n                    <scp>Sturge\u2013Weber<\/scp>\n                    syndrome through Notch signaling"],"prefix":"10.1096","volume":"37","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6093-9146","authenticated-orcid":false,"given":"Lulu","family":"Huang","sequence":"first","affiliation":[{"name":"Department of Ophthalmology Ninth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine  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