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Defects in the proteins pigment epithelium-derived factor (PEDF) and bone-restricted interferon-induced transmembrane protein (BRIL) are the causes of type V and VI osteogenesis imperfecta. [90] Defects in these proteins lead to defective bone mineralization which causes the characteristic brittle bones of osteogenesis imperfecta. [90]
The risk of having osteoporosis includes age and sex. Risk factors include both nonmodifiable (for example, age and some medications that may be necessary to treat a different condition) and modifiable (for example, alcohol use, smoking, vitamin deficiency). In addition, osteoporosis is a recognized complication of specific diseases and disorders.
Osteogenesis imperfecta, type I: Osteogenesis imperfecta is the most common disorder caused by mutations in this gene. Mutations that inactivate one of the two copies of the COL1A1 gene cause osteogenesis imperfecta type I. The mutated copy of the gene does not produce any pro-alpha1(I) collagen chains.
In classic non-deforming osteogenesis imperfecta with blue sclerae or common variable osteogenesis imperfecta with normal sclerae, nearly 60% of cases are de novo. COL1A1/2-related osteogenesis imperfecta is identified by repeated fractures with trivial trauma, defective dentinogenesis imperfecta (DI), and hearing loss.
Type 1 collagen defects may also result in weakened bones, which may result in osteoporosis and fractures, as seen in osteogenesis imperfecta, a genetic disorder which also commonly involves joint hypermobility; Abnormal joint proprioception (an impaired ability to locate body parts in space and/or monitor an extended joint)
They are usually prescribed for patients with osteoporosis or other metastatic bone diseases [clarification needed], such as Paget's disease, osteogenesis imperfecta and fibrous dysplasia. [28] [29] The two main types of anti-resorptive drugs are bisphosphonate and denosumab. These drugs help to decrease the risk of bone fracture and bone pain.
A bone fracture may be the result of high force impact or stress, or a minimal trauma injury as a result of certain medical conditions that weaken the bones, such as osteoporosis, osteopenia, bone cancer, or osteogenesis imperfecta, where the fracture is then properly termed a pathologic fracture. [3]
Defects in collagen type I cause the commonest inherited disorder of bone, called osteogenesis imperfecta. [ 20 ] Minor, but important, amounts of small proteins, including osteocalcin and osteopontin , are secreted in bone's organic matrix. [ 21 ]