Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Osteogenesis imperfecta type I ?
    ### Response:
    Osteogenesis imperfecta (OI) is a group of genetic disorders that mainly affect the bones. Osteogenesis imperfecta type 1 is the mildest form of OI and is characterized by bone fractures during childhood and adolescence that often result from minor trauma. Fractures occur less frequently in adulthood.
    