Clinical Significance
A mutation in the gene ACVR1 (= ALK2) is responsible for the fibrodysplasia ossificans progressiva. ACVR1 encodes activin receptor type-1, a BMP type-1 receptor. The mutation causes the ACVR1 protein to have the amino acid histidine substituted for the amino acid arginine at position 206. This causes endothelial cells to transform to mesenchymal stem cells and then to bone.
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