Redefinition of Exon 7 in the COL1A1 Gene of Type I Collagen by an Intron 8 Splice-Donor–Site Mutation in a Form of Osteogenesis Imperfecta: Influence of Intron Splice Order on Outcome of Splice-Site Mutation

Most splice-site mutations lead to a limited array of products, including exon skipping, use of cryptic splice-acceptor or -donor sites, and intron inclusion. At the intron 8 splice-donor site of the COL1A1 gene, we identified a G+1-->A transition that resulted in the production of several splice products from the mutant allele. These included one in which the upstream exon 7 was extended by 96 nt, others in which either intron 8 or introns 7...