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Mutation analysis of COL1A1 and COL1A2 in patients diagnosed with osteogenesis imperfecta type I-IV

✍ Scribed by Rebecca Pollitt; Robert McMahon; Janice Nunn; Robert Bamford; Amal Afifi; Nicholas Bishop; Ann Dalton

Publisher
John Wiley and Sons
Year
2006
Tongue
English
Weight
149 KB
Volume
27
Category
Article
ISSN
1059-7794

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✦ Synopsis

Osteogenesis Imperfecta (OI) is a heterogeneous group of inherited disorders characterized by increased bone fragility, with clinical severity ranging from mild to lethal. To date, seven types of OI have been described, based on clinical phenotype and histological findings. Most patients with a clinical diagnosis of OI type I-IV have a mutation in the COL1A1 or COL1A2 genes which encode the two alpha chains of type I collagen, the major component of the bone matrix. Analysis of COL1A1 and COL1A2 in a cohort of 83 unrelated patients with OI type I-IV identified a total of 62 mutations. Thirty-eight appear novel, 26 in COL1A1, and 12 in COL1A2, and these are described here. The largest group consists of point mutations affecting glycine residues in the triple helical domain of the two alpha chains, predicted to disrupt protein folding and structure. This is in accordance with previously published data. A doublet GC deletion, an unusual 398 base deletion predicted to completely remove exon 20 of COL1A2, and a point mutation resulting in substitution of a conserved cysteine in the C-terminal propeptide are described. In addition rare mutations at the cleavage sites of the C-propeptide and the N-terminal signal peptide are described.

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Osteogenesis imperfecta (OI) is a heritable disease of bone characterized by low bone mass and bone fragility. Six different types of OI have been described to date, based on clinical phenotype and histological findings. The genetic defect in many patients with OI types I-IV is due to mutations in t

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## Communicated by Peter Byers Osteogenesis imperfecta (OI) is caused by mutations in COL1A1 and COL1A2 that code for the a1 and a2 chains of type I collagen. Phenotypes correlate with the mutation types in that COL1A1 null mutations lead to OI type I, and structural mutations in a1(I) or a2(I) lea

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The original article to which this Erratum refers was published in Human Mutation 24: 147-154 (2004). In Table 1 of the published original article, the fourth mutation should be c.913G4C (not c.913G4A as originally printed) and it should be bolded as it is a novel mutation. In addition, the last mu

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Osteogenesis imperfecta (OI) type I is caused by a reduction of type I collagen resulting from the presence of a non-functional COL1A1 allele (null-allele). Owing to the lack of mutant mRNA, genomic screening of the COL1A1 and COL1A2 genes is required to identify a causal mutation, which is a costly