Mutations had been identified (1) in the BMP1 gene on chromosome 8 associated with recessive OI and (2) in the TTC7A gene on chromosome 2 associated with recessive MIA (Bernard et al., 2011; Tetreault et al., 2011; Fahiminiya et al., 2015). The gene discussed is BMP1; the disease is osteogenesis imperfecta.