LAUSR

Osteogenesis imperfecta (OI) is a genetic disorder of connective tissue with variable phenotype and heterogeneous genetic background. Majority of reported mutations are glycine substitutions, whose clinical outcome ranges from mild to perinatal lethal. The phenotype appears to be influenced by the properties of amino acid side chain and the degree of structural aberration of collagen molecules. Since the genotype–phenotype correlation remains unclear, the severity of mutation is mostly predicted according to previously‐reported cases. Although the number of OI variants is constantly expanding, no glycine‐to‐tryptophan substitutions have been reported in COL1A1 gene.