, Volume 88, Issue 2–3, pp 187–196 | Cite as

Hotspots of meiotic recombination in the mouse major histocompatibility complex

  • Toshihiko Shiroishi
  • Tomoko Sagai
  • Kazuo Moriwaki


Meiotic recombination is not random in the proximal region of the mouse major histocompatibility complex (MHC). It is clustered at four restricted positions, so-called hotspots. Some of the MHC haplotypes derived from Asian wild mice enhance recombination at the hotspots in genetic crosses with standard MHC haplotypes of laboratory mouse strains. In particular, the wm7 haplotype derived from Japanese wild mouse indicated an approximately 2% recombination frequency within a 1.2 kb fragment of DNA in the interval between the Pb and Ob genes. Interestingly, this enhancement of recombination was observed only in female meiosis but not in male meiosis. Mating experiments demonstrated that the wm7 haplotype carries a genetic factor in the region proximal to the hotspot, which instigates recombination. In addition, the wm7 haplotype has a genetic factor located in the region distal to the hotspot, which suppresses recombination. From the molecular characterization of the two hotspots located in the Eb gene and the Pb-Ob interval, it appeared that there are several common molecular elements, the consensus of the middle repetitive MT-family, TCTG or CCTG tetramer repeats, and the solitary long terminal repeat (LTR) of mouse retrovirus.

Key words

meiosis recombination hotspot mouse MHC 


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Copyright information

© Kluwer Academic Publishers 1993

Authors and Affiliations

  • Toshihiko Shiroishi
    • 1
  • Tomoko Sagai
    • 1
  • Kazuo Moriwaki
    • 1
  1. 1.Department of Cell GeneticsNational Institute of GeneticsMishima Shizuoka-kenJapan

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