Recombination hot spot in the human beta-globin gene cluster: meiotic recombination of human DNA fragments in Saccharomyces cerevisiae.

We describe a novel system for the analysis of sequence-specific meiotic recombination in Saccharomyces cerevisiae. A comparison of three adjacent restriction fragments from the human beta-globin locus revealed that one of them, previously hypothesized to contain a relative hot spot for genetic recombination, engages in reciprocal exchange during yeast meiosis significantly more frequently than either of the other two fragments. Removal of the longest of four potential Z-DNA-forming regions from this fragment does not affect the high frequency of genetic recombination.