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Type I collagen is a member of group I collagen found in most connective tissues such as skin, bone and tendon。 Collagen type I is produced from procollagen when two teloterminal propeptides are digested from the procursor and released into the circulation。 Type I collagen is a heterotrimer that consists of two alpha 1 chains and one alpha 2 chain。 Mutations in the COL1A1 gene encoding the alpha 1 chain are associated with osteogenesis imperfecta types I-IV, Ehlers-Danlos syndrome type VIIA, Ehlers-Danlos syndrome Classical type, Caffey Disease and idiopathic osteoporosis。 Mutations in the COL1A2 gene encoding the alpha 2 chain are associated with osteogenesis imperfecta types I-IV, Ehlers-Danlos syndrome type VIIB, recessive Ehlers-Danlos syndrome Classical type, idiopathic osteoporosis, and atypical Marfan syndrome。


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