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osteogenesis imperfecta/l cysteina
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Substitution of cysteine for glycine within the carboxyl-terminal telopeptide of the alpha 1 chain of type I collagen produces mild osteogenesis imperfecta.
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We have characterized a mutation that produces mild, dominantly inherited osteogenesis imperfecta. Half of the alpha 1 (I) chains of type I collagen synthesized by cells from an affected individual contain a cysteine residue in the 196-residue carboxyl-terminal cyanogen bromide peptide of the
A lethal variant of osteogenesis imperfecta has a single base mutation that substitutes cysteine for glycine 904 of the alpha 1(I) chain of type I procollagen. The asymptomatic mother has an unidentified mutation producing an overmodified and unstable type I procollagen.
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A fraction of the pro alpha 1(I) and pro alpha 2(I) chains in type I procollagen synthesized by the fibroblasts from a proband with a lethal variant of osteogenesis imperfecta were overmodified by posttranslational reactions. After digestion with pepsin, some of the alpha 1(I) chains were recovered
Phenotypic heterogeneity in osteogenesis imperfecta: the mildly affected mother of a proband with a lethal variant has the same mutation substituting cysteine for alpha 1-glycine 904 in a type I procollagen gene (COL1A1).
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A proband with a lethal variant of osteogenesis imperfecta (OI) has been shown to have, in one allele in a gene for type I procollagen (COL1A1), a single base mutation that converted the codon for alpha 1-glycine 904 to a codon for cysteine. The mutation caused the synthesis of type I procollagen
Substitution of cysteine for glycine-alpha 1-691 in the pro alpha 1(I) chain of type I procollagen in a proband with lethal osteogenesis imperfecta destabilizes the triple helix at a site C-terminal to the substitution.
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Skin fibroblasts from a proband with lethal osteogenesis imperfecta synthesized a type I procollagen containing a cysteine residue in the alpha 1(I) helical domain. Assay of thermal stability of the triple helix by proteinase digestion demonstrated a decreased temperature for thermal unfolding of
A cysteine for glycine substitution at position 175 in an alpha 1 (I) chain of type I collagen produces a clinically heterogeneous form of osteogenesis imperfecta.
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The molecular basis for Osteogenesis Imperfecta in a large kindred with a highly variable phenotype was identified by sequencing the mutant pro alpha 1 (I) protein, cDNA and genomic DNA from the proband. Fibroblasts from different affected individuals all synthesize both normal Type I procollagen
Cysteine in the triple helical domain of the pro alpha 2(I) chain of type-I collagen in nonlethal forms of osteogenesis imperfecta.
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To determine if some individuals with deforming varieties of osteogenesis imperfecta (OI) carry point mutations in the COL1A2 gene of type-I collagen, we examined collagens synthesized by cell strains from affected individuals for the presence of cysteine in the triple helical domain of the alpha 2
Substitution of cysteine for glycine-946 in the alpha 1(I) chain of type I procollagen causes lethal osteogenesis imperfecta.
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Procollagen synthesized by skin fibroblasts from a patient with a lethal variant of osteogenesis imperfecta has been characterized. After pepsin digestion of the type I procollagen, a portion of the alpha 1(I) chains was recovered as a disulfide-bonded dimer. Cyanogen bromide peptide mapping
Osteogenesis imperfecta. The position of substitution for glycine by cysteine in the triple helical domain of the pro alpha 1(I) chains of type I collagen determines the clinical phenotype.
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Skin fibroblasts grown from three individuals with osteogenesis imperfecta (OI) each synthesized a population of normal type I collagen molecules and additional molecules that had one or two alpha 1(I) chains that contained a cysteine residue within the triple-helical domain, a region from which
Clinical variability of osteogenesis imperfecta reflecting molecular heterogeneity: cysteine substitutions in the alpha 1(I) collagen chain producing lethal and mild forms.
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We have examined the collagenous proteins extracted from skin and produced by skin fibroblast cultures from the members of a family with mild dominant osteogenesis imperfecta (OI type I). The two affected patients, mother and son, produce two populations of alpha 1(I) chains of type I collagen, one
Substitution of cysteine for glycine at residue 415 of one allele of the alpha 1(I) chain of type I procollagen in type III/IV osteogenesis imperfecta.
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We have examined the type I collagen in a patient with type III/IV osteogenesis imperfecta. Two forms of alpha 1(I) chain were produced, one normal and the other containing a cysteine residue within the triple helical domain of the molecule. Cysteine is not normally present in this domain of type I
A cysteine for glycine substitution at position 1017 in an alpha 1(I) chain of type I collagen in a patient with mild dominantly inherited osteogenesis imperfecta.
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Osteogenesis imperfecta (OI) is a heterogeneous group of inherited diseases of connective tissue manifested primarily by excessive fracturing of bone but associated with other abnormalities such as blue sclera, thin skin, herniae, ligamentous laxity, reduced stature and hearing loss. We report here
A point mutation in a type I procollagen gene converts glycine 748 of the alpha 1 chain to cysteine and destabilizes the triple helix in a lethal variant of osteogenesis imperfecta.
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Synthesis of type I procollagen was examined in fibroblasts from a proband with a lethal perinatal variant of osteogenesis imperfecta. After trypsin digestion of the type I procollagen, a portion of the alpha 1 (I) chains was recovered as disulfide-linked dimers. Digestion of the protein with
The molecular defect in an autosomal dominant form of osteogenesis imperfecta. Synthesis of type I procollagen containing cysteine in the triple-helical domain of pro-alpha 1(I) chains.
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Synthesis of procollagen was examined in skin fibroblasts from a patient with a moderately severe autosomal dominant form of osteogenesis imperfecta. Proteolytic removal of the propeptide regions of newly synthesized procollagen, followed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis
A de novo G to T transversion in a pro-alpha 1 (I) collagen gene for a moderate case of osteogenesis imperfecta. Substitution of cysteine for glycine 178 in the triple helical domain.
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Cultured fibroblasts from a patient affected with a moderate form of osteogenesis imperfecta were defective for the synthesis of type I collagen molecules; about half of the alpha 1(I) chains contained a cysteine residue in the triple helical domain and a disulfide link formed when two mutant alpha
An osteopenic nonfracture syndrome with features of mild osteogenesis imperfecta associated with the substitution of a cysteine for glycine at triple helix position 43 in the pro alpha 1(I) chain of type I collagen.
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Mutations affecting the pro alpha 1(I) or pro alpha 2(I) collagen genes have been identified in each of the major clinical types of osteogenesis imperfecta. This study reports the presence of a heritable connective tissue disorder in a family with an osteopenic syndrome which has features of mild
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