Summary
Type I collagen chains of a proband from a family with recurrent lethal osteogenesis imperfecta (OI) migrated as a doublet when submitted to gel electrophoresis. Cyanogen bromide (CNBr) peptide mapping demonstrated that the post-translational over-modifications were initiated in α1ICB7. Chemical cleavage of cDNA-RNA heteroduplexes identified a mismatch in the α1I cDNA; this mismatch was subsequently confirmed by sequencing a 249-bp fragment amplified by the polymerase chain reaction. A G to T transition in the second base of the first codon of exon 41 resulted in the substitution of glycine 802 by valine. This mutation impaired collagen secretion by dermal fibroblasts. The over-modified chains were retained intracellularly and melted at a lower temperature than normal chains. Collagen molecules synthesized by parental fibroblasts had a normal electrophoretic mobility, but hybridization of genomic DNA with allele-specific oligonucleotides revealed the presence of the mutant allele in the mother's leukocytes. The mutation was not detected in her fibroblasts consistent with the protein data. These results support the hypothesis that somatic and germ-line mosaicism in the phenotypically normal mother explain the recurrence of OI.
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Bonaventure, J., Cohen-Solal, L., Lasselin, C. et al. A dominant mutation in the COL1A1 gene that substitutes glycine for valine causes recurrent lethal osteogenesis imperfecta. Hum Genet 89, 640–646 (1992). https://doi.org/10.1007/BF00221955
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DOI: https://doi.org/10.1007/BF00221955