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• W2100045665 abstract "An inbred strain of transgenic mice that expressed a mutated gene for type I procollagen and that developed spontaneous fractures was used to study the effects of age on the phenotype of fragile bones. The mutated gene has been shown to cause depletion of type I collagen in the transgenic mice because it generated shortened pro alpha 1(I) chains that bound to and produced degradation of normal pro alpha 1(I) chains synthesized from the endogenous mouse COL1A1 gene. For this study, femurs from transgenic mice ranging in age from 0.5-24 months were examined. The results demonstrated that the level of expression of the transgene was independent of age. Femurs from the transgenic mice were more fragile than controls at 0.5 and 1.5 months, they were biomechanically normal at 6 months, and then they were more fragile at 24 months. The normal biomechanical properties of the bones from the transgenic mice at 6 months were accompanied by periosteal thickening of the bones together with an increase in the collagen content that was not associated with a proportional increase in mineral content. The results indicated that the effects of age, mechanical stress, and hormonal action produced a biological compensation for the mutated gene by either increasing collagen synthesis of bone, decreasing collagen degradation, or both. The biological compensation was apparently lost by 24 months when the outer diameters of the femurs were again less than in controls, the cortical thickness was about the same as in controls, and both the collagen and mineral contents were less than controls. The results demonstrated that bone fragility in the transgenic mice paralleled the age-dependent phenotype of human osteogenesis imperfecta. Therefore the transgenic mice appeared to be useful models for osteogenesis imperfecta. They also may be useful models for some forms of osteoporosis." @default.
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• W2100045665 date "2009-12-03" @default.
• W2100045665 modified "2023-09-27" @default.
• W2100045665 title "Bone fragility in transgenic mice expressing a mutated gene for type I procollagen (COL1A1) parallels the age-dependent phenotype of human osteogenesis imperfecta" @default.
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• W2100045665 doi "https://doi.org/10.1002/jbmr.5650101202" @default.
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