Quantification analysis of 5'-splice signal sequences in mRNA precursors. Mutations in 5'-splice signal sequence of human beta-globin gene and beta-thalassemia.
Concerning the signals which direct excision of introns from mRNA precursors in higher eukaryotic genes, consensus 9-nucleotide sequence, (CA)AG/GT(AG)AGT, has been proposed with the 5'-splice site, but actual 5'-splice site sequences differ from it in a greater or lesser degree. We analyzed 5'-splice site sequence of human beta-globin gene by quantification method (categorical discriminant analysis) proposed previously. Analysis of 13-nucleotide sequences and deleted sequences showed that 9-nucleotide sequences in the consensus region are almost sufficient to define 5'-splice signal. To confirm this view, we examined a number of beta-globin mutant genes, where nucleotide changes occur at the authentic 5'-splice site of the first intron and cause beta-thalassemia phenotype. Our method could explain why such mutations abolish the 5'-splice site and cryptic 5'-splice sites are activated.
Iida
Y
Y
Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo, Japan.
D001483:Base Sequence; D005914:Globins / Q000235:genetics; D006801:Humans; D008957:Models, Genetic; D008969:Molecular Sequence Data; D009154:Mutation; D012322:RNA Precursors / Q000235:genetics*; D012326:RNA Splicing / Q000235:genetics*; D013789:Thalassemia / Q000235:genetics
D012322:RNA Precursors; D005914:Globins