" /> Osteogenesis imperfecta, type V - CISMeF





Preferred Label : Osteogenesis imperfecta, type V;

Symbol : OI5;

CISMeF acronym : OI5;

Type : Phenotype, molecular basis known;

Alternative titles and symbols : Oi, type V;

Description : Osteogenesis imperfecta is a connective tissue disorder characterized by bone fragility and low bone mass. Due to considerable phenotypic variability, Sillence et al. (1979) developed a classification of OI subtypes based on clinical features and disease severity: OI type I, with blue sclerae (166200); perinatal lethal OI type II, also known as congenital OI (166210); OI type III, a progressively deforming form with normal sclerae (259420); and OI type IV, with normal sclerae (166220). Most forms of OI are autosomal dominant with mutations in one of the 2 genes that code for type I collagen alpha chains, COL1A1 (120150) and COL1A2 (120160). Glorieux et al. (2000) described a novel autosomal dominant form of OI, which they designated OI type V, in 7 patients. The disorder was similar to OI type IV but had distinctive clinical, histologic, and molecular characteristics. OI type V is characterized by calcification of the forearm interosseous membrane, radial head dislocation, a subphyseal metaphyseal radiodense line, and hyperplastic callus formation (summary by Cho et al., 2012).;

Inheritance : Autosomal dominant;

Molecular basis : Caused by mutation in the interferon-induced transmembrane protein 5 gene (IFITM5, 614757.0001);

Laboratory abnormalities : Elevated serum alkaline phosphatase during hyperplastic callus formation; Increased urinary collagen type I N-telopeptide excretion (NTx) during hyperplastic callus formation;

Prefixed ID : #610967;

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03/05/2025


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