Osteogenesis imperfecta type I is a mild type of osteogenesis imperfecta (OI), a genetic disorder characterized by increased bone fragility, low bone mass and susceptibility to bone fractures. The disease is Monarch Disease Ontology identifier MONDO_0008146 (osteogenesis imperfecta type 1). Also known as: Adair-Dighton syndrome, COL1A1-related osteogenesis imperfecta, OI type 1, OI1, Van der Hoeve syndrome, mild osteogenesis imperfecta, non-deforming osteogenesis imperfecta, osteogenesis imperfecta type I.