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The genomic organization of three haplotypes of beta-globin genes was determined to resolve the question of the number of those genes in rat. Haplotype a, found in inbred strain DA, has three genes or pseudogenes, while haplotypes b, found in AO, Y5 and Wistar strains, and c, found in Wistar strain, have five genes or pseudogenes each. In haplotypes b and c, the first gene is of beta major type and the remaining four are of beta minor type. Partial sequencing of six out of 13 genes shows that duplications of beta minor genes are causing polymorphism in a number of genes. Also, in haplotype b two beta minor genes have a 6.5-kb intron 2, while in haplotype c only one beta minor gene contains such a large intron 2. The three structurally different haplotypes described are not interconvertible by single recombination events. The results indicate that the rat has the highest number of adult beta-globin genes found in mammals so far.
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