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• W4311194058 abstract "Abstract Fibrodysplasia ossificans progressiva (FOP) is a rare human genetic condition characterized by altered skeletal development and extra-skeletal bone formation. All cases of FOP are caused by mutations in the type I BMP receptor gene ACVR1 that result in over-activation of the BMP signaling pathway. Activation of the wild-type ACVR1 kinase requires assembly of a tetrameric type I and II BMP receptor complex followed by phosphorylation of the ACVR1 GS domain by type II BMP receptors. Previous studies showed that the FOP mutant ACVR1-R206H requires type II BMP receptors and presumptive GS domain phosphorylation for over-active signaling. Structural modeling of the FOP-ACVR1 mutant kinase domain supports that FOP mutations alter the conformation of the GS domain, but it is unclear how this leads to overactive signaling. Here we show using a developing zebrafish embryo BMP signaling assay that the FOP mutant receptors ACVR1-R206H and -G328R have reduced requirements for GS domain phosphorylation sites to signal compared to wild-type ACVR1. Further, ligandindependent and ligand-dependent signaling through the FOP ACVR1 receptors have distinct GS domain phosphorylation site requirements. Moreover, ACVR1-G328 showed increased GS domain serine/threonine requirements for ligand-independent signaling compared to ACVR1-R206H, whereas it exhibited reduced serine/threonine requirements for ligand-dependent signaling. Remarkably, while ACVR1-R206H does not require the type I BMP receptor partner, Bmpr1, to signal, a ligand-dependent GS domain mutant of ACVR1-R206H could signal independently of Bmpr1 only when Bmp7 ligand was overexpressed. Of note, unlike human ACVR1-R206H, the zebrafish paralog Acvr1l-R203H does not show increased signaling activity. However, in domain-swapping studies the human kinase domain, but not the human GS domain, was sufficient to confer overactive signaling to the Acvr1l-R203H receptor. Together these results reflect the importance of GS domain activation and kinase domain functions in regulating ACVR1 signaling and identify mechanisms of reduced regulatory constraints conferred by FOP mutations." @default.
• W4311194058 created "2022-12-24" @default.
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• W4311194058 date "2022-12-01" @default.
• W4311194058 modified "2023-10-15" @default.
• W4311194058 title "Reduced GS domain serine/threonine requirements of Fibrodysplasia Ossificans Progressiva mutant type I BMP receptor ACVR1 in the zebrafish" @default.
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• W4311194058 doi "https://doi.org/10.1101/2022.12.01.518722" @default.
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