Abstract
Glycophorins A (GPA) and B (GPB) are two major sialoglycoproteins of the human erythrocyte membrane. Here we present a comparison of the genomic structures of GPA and GPB developed by analyzing DNA clones isolated from a K562 genomic library. Nucleotide sequences of exon-intron junctions and 5' and 3' flanking sequences revealed that the GPA and GPB genes consist of 7 and 5 exons, respectively, and both genes have greater than 95% identical sequence from the 5' flanking region to the region approximately 1 kilobase downstream from the exon encoding the transmembrane regions. In this homologous part of the genes, GPB lacks one exon due to a point mutation at the 5' splicing site of the third intron, which inactivates the 5' cleavage event of splicing and leads to ligation of the second to the fourth exon. Following these very homologous sequences, the genomic sequences for GPA and GPB diverge significantly and no homology can be detected in their 3' end sequences. The transition site from homologous to nonhomologous sequences can be localized within Alu repeat sequences. The analysis of the Alu sequences and their flanking direct repeat sequences suggest that an ancestral genomic structure has been maintained in the GPA gene, whereas the GPB gene has arisen from the acquisition of 3' sequences different from those of the GPA gene by homologous recombination at the Alu repeats during or after gene duplication.
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