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We have reported in rat three adult beta-gene haplotypes containing either five or three genes. Detailed sequence analysis reveals that the leftmost gene is the major gene and that at the opposite end downstream lies the minor gene. All of the genes lying between them are minor-major hybrids indicating their origin by unequal crossing-over. In two haplotypes beta-globin genes were found with an L1(1) element inserted directly into IVS2. The described results allow the formulation of a pathway of mutational events leading from the ancient two-beta-gene rodent ancestor through a three-gene haplotype to five-gene haplotypes, one of which is postulated to have arisen in common laboratory strains since their capture in the wild.

Origin of rat beta-globin haplotypes containing three and five genes.