The Position of Sex-Determining Genes in the Chromosomes of Rana nigromaculata and Rana brevipoda

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概要

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• The present authors performed crossing experiments to examine the presence of linkages between the sex-determining genes and the seven loci controlling seven enzymes located on chromosomes Nos. 3 and 4 in Rana brevipoda and Rana nigromaculata. In the crossings, male frogs whose genotypes of some enzymes were always heterozygous were used and the genotypes of the same enzymes in the offspring were compared with those of the male parents. When the genotypes of the offspring were almost the same in constitution as those of the male parents, the loci of these enzymes were considered to be linked with the sex-determining genes and the frogs were considered to be male heterogametic. When heterozygous males of the Konko population of R. brevipoda were used, the sex-determining genes were found to be linked with the MPI, LDH-B and Pep-B loci on chromosome No. 4,and their recombination rates were assumed to be 11.1%, 10.5% and 5.1%, respectively, while the sex-determining genes were not linked with the ME-B locus situated on chromosome No. 3. On the other hand, when heterozygous males of the Maibara population of R. brevipoda were used, the sex-determining genes were found to be linked with the ME-B locus on chromosome No. 3 and the recombination rate was assumed to be 2.2%. The sex-determining genes were not linked with the MPI, LDH-B and Pep-B loci situated on chromosome No. 4. When heterozygous males of the Hiro and Kumano populations of R. nigromaculata were used, the sex-determining genes were found to be linked with the MPI locus on chromosome No. 4,and the recombination rates were assumed to be 8.9% and 8.6%, respectively. These results suggested that the above stated frogs were male heterogametic. In contrast, in five of the nine male frogs of the Kaita population of R. nigromaculata, the sex-determining genes were linked with the MPI, SORDH, ENO and HK loci on chromosome No. 4. The recombination rates of these loci were assumed to be 7.9%, 6.2%, 11.4% and 8.7%, respectively. In the remaining four male frogs, the sex-determining genes were not linked with the MPI and SORDH loci on chromosome No. 4 as well as the ME-B locus on chromosome No. 3. In the analyses of the offspring of female frogs whose genotypes were heterozygous in any of the seven loci situated on chromosomes Nos. 3 and 4,no locus linked with the sex-determining genes was discovered.

• 広島大学の論文

著者

• Nishioka Midori

  Laboratory For Amphibian Biology Faculty Of Science Hiroshima University

• SUMIDA Masayuki

  Laboratory for Amphibian Biology, Faculty of Science, Hiroshima University

• Sumida Masayuki

  Laboratory For Amphibian Biology Faculty Of Science Hiroshima University

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