Predicted to enable SMAD binding activity and transforming growth factor beta receptor activity, type I. Predicted to be involved in several processes, including dorsal/ventral pattern formation; heart development; and transforming growth factor beta receptor superfamily signaling pathway. Predicted to act upstream of or within cell surface receptor protein serine/threonine kinase signaling pathway. Predicted to be located in membrane. Predicted to be part of BMP receptor complex. Predicted to be active in plasma membrane. Human ortholog(s) of this gene implicated in exfoliation syndrome; fibrodysplasia ossificans progressiva; primary angle-closure glaucoma; and primary open angle glaucoma. Orthologous to human ACVR1 (activin A receptor type 1).