Loeys-Dietz Syndrome Watchlist (log in to enable) Retrieved 2021-01-23 Source Orphanet Trials — Genes TGFBR1, TGFBR2, TGFB2, SMAD3, TGFB3 Drugs — Interested in hearing about new therapies? Registered! Loeys-Dietz syndrome is a rare genetic connective tissue disorder characterized by a broad spectrum of craniofacial, vascular and skeletal manifestations with four genetic subtypes described forming a clinical continuum.