Detection of Quantitative Trait Loci Causing Abnormal Spermatogenesis and Reduced Testis Weight in the Small Testis (Smt) Mutant Mouse

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  • BOLOR Hasbaira
    Division of Applied Genetics and Physiology, Graduate School of Bioagricultural Sciences, Nagoya University
  • WAKASUGI Noboru
    Division of Applied Genetics and Physiology, Graduate School of Bioagricultural Sciences, Nagoya University
  • ZHAO Wei Dong
    Laboratory of Animal Genetics and Breeding, Department of Animal Science, College of Animal Husbandry and Veterinary Medicine, Henan Agricultural University
  • ISHIKAWA Akira
    Division of Applied Genetics and Physiology, Graduate School of Bioagricultural Sciences, Nagoya University

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The small testis (Smt) mutant mouse is characterized by a small testis of one third to one half the size of a normal testis, and its spermatogenesis is mostly arrested at early stages of meiosis, although a small number of spermatocytes at the late prophase of meiosis and a few spermatids can sometimes be seen. We performed quantitative trait locus (QTL) analysis of these spermatogenic traits and testis weight using 221 F2 males obtained from a cross between Smt and MOM (Mus musculus molossinus) mice. At the genome-wide 5% level, we detected two QTLs affecting meiosis on chromosomes 4 and 13, and two QTLs for paired testis weight as a percentage of body weight on chromosomes 4 and X. In addition, we found several QTLs for degenerated germ cells and multinuclear giant cells on chromosomes 4, 7 and 13. Interestingly, for cell degeneration, the QTL on chromosome 13 interacted epistatically with the QTL on chromosome 4. These results reveal polygenic participation in the abnormal spermatogenesis and small testis size in the Smt mutant.<br>

収録刊行物

  • Experimental Animals

    Experimental Animals 55 (2), 97-108, 2006

    公益社団法人 日本実験動物学会

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