A de novo G+1-->A mutation at the alpha 2(I) exon 16 splice donor site causes skipping of exon 16 in the cDNA of one allele of an OI type IV proband
We have investigated the procollagen, collagen, alpha 2(I) mRNA, and DNA of a proband with type IV OI. The proband synthesized two alpha 2(I) chains, one with normal electrophoretic migration and one more rapidly migrating. The fast alpha 2(I) chain was relatively retained within the cell and was pr...
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Published in | Human mutation Vol. 2; no. 5; p. 380 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
United States
1993
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Abstract | We have investigated the procollagen, collagen, alpha 2(I) mRNA, and DNA of a proband with type IV OI. The proband synthesized two alpha 2(I) chains, one with normal electrophoretic migration and one more rapidly migrating. The fast alpha 2(I) chain was relatively retained within the cell and was present in collagens synthesized in the presence of alpha,alpha'-dipyridyl. The alpha 2(I) cyanogen bromide peptide CB 4-2 contained both normal and rapidly migrating components. Thermal stability of helices containing the rapidly migrating alpha 2(I) chain was reduced 6 degrees C. Parental fibroblast collagens were normal. RNA/RNA hybrids between proband total RNA and antisense riboprobe complementary to alpha 2(I) nt 236-1390 were digested with RNase A and T1. Digestion products seen exclusively in the proband suggested a structural change in the region coding for exons 16-19. The region which hybridized to the riboprobe was amplified using RNA-PCR and subcloned. Multiple restriction enzyme digestions of the two subcloned alleles suggested a structural change localized to the region coding for exons 16-17. Sequencing revealed a deletion of the 54 bp comprising exon 16 in the cDNA of one allele. The region of the proband's genomic DNA spanning exons 15-17 was amplified by PCR. The subcloned genomic fragments of each allele were distinguished by RNA/DNA hybrid analysis using a riboprobe complementary to normal genomic DNA from this region. Sequencing revealed a G+1-->A mutation at the exon 16 donor site in one allele. The mutation eliminates a StyI site. |
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AbstractList | We have investigated the procollagen, collagen, alpha 2(I) mRNA, and DNA of a proband with type IV OI. The proband synthesized two alpha 2(I) chains, one with normal electrophoretic migration and one more rapidly migrating. The fast alpha 2(I) chain was relatively retained within the cell and was present in collagens synthesized in the presence of alpha,alpha'-dipyridyl. The alpha 2(I) cyanogen bromide peptide CB 4-2 contained both normal and rapidly migrating components. Thermal stability of helices containing the rapidly migrating alpha 2(I) chain was reduced 6 degrees C. Parental fibroblast collagens were normal. RNA/RNA hybrids between proband total RNA and antisense riboprobe complementary to alpha 2(I) nt 236-1390 were digested with RNase A and T1. Digestion products seen exclusively in the proband suggested a structural change in the region coding for exons 16-19. The region which hybridized to the riboprobe was amplified using RNA-PCR and subcloned. Multiple restriction enzyme digestions of the two subcloned alleles suggested a structural change localized to the region coding for exons 16-17. Sequencing revealed a deletion of the 54 bp comprising exon 16 in the cDNA of one allele. The region of the proband's genomic DNA spanning exons 15-17 was amplified by PCR. The subcloned genomic fragments of each allele were distinguished by RNA/DNA hybrid analysis using a riboprobe complementary to normal genomic DNA from this region. Sequencing revealed a G+1-->A mutation at the exon 16 donor site in one allele. The mutation eliminates a StyI site. |
Author | Orrison, B M Lewis, M B Wang, Q Marini, J C Filie, J D |
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Snippet | We have investigated the procollagen, collagen, alpha 2(I) mRNA, and DNA of a proband with type IV OI. The proband synthesized two alpha 2(I) chains, one with... |
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SubjectTerms | Alleles Base Sequence Child, Preschool Collagen - genetics DNA - genetics Exons - genetics Female Fibroblasts Humans Molecular Sequence Data Osteogenesis Imperfecta - genetics Point Mutation - genetics RNA Splicing - genetics RNA, Messenger - genetics |
Title | A de novo G+1-->A mutation at the alpha 2(I) exon 16 splice donor site causes skipping of exon 16 in the cDNA of one allele of an OI type IV proband |
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