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Bone morphogenetic protein (BMP) type I receptors are serine-threonine kinase transmembrane signal transduction proteins that regulate a vast array of ligand-dependent cell-fate decisions with temporal and spatial fidelity during development and postnatal life. A recent discovery identified a recurrent activating heterozygous missense mutation in a BMP type I receptor [Activin receptor IA/activin-like kinase 2 (ACVR1; also known as ALK2)] in patients with the disabling genetic disorder fibrodysplasia ossificans progressiva (FOP). Individuals with FOP experience episodes of tissue metamorphosis that convert soft connective tissue such as skeletal muscle into a highly ramified and disabling second skeleton of heterotopic bone. The single nucleotide ACVR1/ALK2 mutation that causes FOP is one of the most specific disease-causing mutations in the human genome and to date the only known inherited activating mutation of a BMP receptor that causes a human disease. Thus, the study of FOP provides the basis for understanding the clinically relevant effects of activating mutations in the BMP signaling pathway. Here we briefly review methodologies that we have applied to studying activated BMP signaling in FOP.

Investigations of Activated ACVR1/ALK2, a Bone Morphogenetic Protein Type I Receptor, That Causes Fibrodysplasia Ossificans Progressiva