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Published on: March 12, 2022
Homozygous stop-gain variant in LRRC32, encoding a TGFβ receptor, associated with cleft palate, proliferative
Tamar Harel1, Ephrat Levy-Lahad2, Muhannad Daana3
1Department of Genetic and Metabolic Diseases, Hadassah-Hebrew University Medical Center, 9112001, Jerusalem, Israel. tamarhe@hadassah.org.il.
Abstract:
The transforming growth factor-beta (TGFβ) signaling pathway is essential for palatogenesis and retinal development. Glycoprotein A repetitions predominant (GARP), encoded by LRRC32, is a TGFβ cell surface receptor that has been studied primarily in the context of cellular immunity. We identified a homozygous stop-gain variant in LRRC32 (c.1630C>T; p.(Arg544Ter)) in two families with developmental delay, cleft palate, and proliferative retinopathy. Garp-null mice have palate defects and die within 24 h after birth. Our study establishes LRRC32 as a candidate disease-associated gene in humans and lends further support to the role of the TGFβ pathway in palatogenesis and retinal development.
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