COL1A1 and osteogenesis imperfecta: Although dominant mutations in the type I procollagen genes, COL1A1 and COL1A2, account for the majority of patients with Osteogenesis Imperfecta (OI) (#166200, #166210, #166220, #259420, #259440, #610682, #610915, #610967, #610968, #613848, #613849, #613982, #614856, #615066), the disorder can also be inherited in an autosomal recessive manner [1].