{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2024,3,13]],"date-time":"2024-03-13T15:16:13Z","timestamp":1710342973363},"reference-count":28,"publisher":"Oxford University Press (OUP)","issue":"3","license":[{"start":{"date-parts":[[1999,3,1]],"date-time":"1999-03-01T00:00:00Z","timestamp":920246400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/academic.oup.com\/journals\/pages\/open_access\/funder_policies\/chorus\/standard_publication_model"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[1999,3,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>Mutations in the type I collagen genes have been identified as the cause of all four types of osteogenesis imperfecta (OI). We now report a mutation that extends the phenotype associated with structural abnormalities in type I collagen. Two siblings presented with a history of back pain and were diagnosed with juvenile osteoporosis, based on clinical and radiological examination. Radiographs showed decreased lumbar bone density and multiple compression fractures throughout the thoracic and lumbar spines of both patients. One child has moderate short stature and mild neurosensory hearing loss. However, neither child has incurred the long bone fractures characteristic of OI. Protein studies demonstrated electrophoretically abnormal type I collagen in samples from both children. Enzymatic cleavage of RNA:RNA hybrids identified a mismatch in type I collagen \u03b12 (COL1A2) mRNA. DNA sequencing of COL1A2 cDNA subclones defined the mismatch as a single-base mutation (1715G \u2192 A) in both children. This mutation predicts the substitution of arginine for glycine at position 436 (G436R) in the helical domain of the \u03b12(I) chain. Analysis of genomic DNA identified the mutation in the asymptomatic father, who is presumably a germ-line mosaic carrier. The presence of the same heterozygous mutation in two siblings strongly suggests that the probands display the full phenotype. Taken together, the clinical, biochemical, and molecular findings of this study extend the phenotype associated with type I collagen mutations to cases with only spine manifestations and variable short stature into adolescence.<\/jats:p>","DOI":"10.1359\/jbmr.1999.14.3.449","type":"journal-article","created":{"date-parts":[[2006,4,27]],"date-time":"2006-04-27T01:23:55Z","timestamp":1146101035000},"page":"449-455","source":"Crossref","is-referenced-by-count":18,"title":["Extension of Phenotype Associated with Structural Mutations in Type I Collagen: Siblings with Juvenile Osteoporosis Have an \u03b12(I)Gly436 \u2192 Arg Substitution"],"prefix":"10.1093","volume":"14","author":[{"given":"Paul A.","family":"Dawson","sequence":"first","affiliation":[{"name":"Section on Connective Tissue Disorders, Heritable Disorders Branch, National Institute of Child Health and Human Development, Bethesda, Maryland, U.S.A."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Thaddeus 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