Hybrid lethal systems in theDrosophila melanogaster species complex |
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Authors: | Kyoichi Sawamura Takao K Watanabe Masa-Toshi Yamamoto |
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Institution: | (1) Department of Biology, School of Education, Waseda University, Nishi-Waseda, 169-50 Tokyo, Japan;(2) Department of Applied Biology, Kyoto Institute of Technology, Matsugasaki, 606 Kyoto, Japan;(3) Division of Biology, Miyazaki Medical College, Kiyotake, 889-16 Miyazaki, Japan |
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Abstract: | Lethal phases of the hybrids betweenDrosophila melanogaster and its sibling species,D. simulans are classified into three types: (1) embryonic lethality in hybrids carryingD. simulans cytoplasm andD. melanogaster X chromosome, (2) larval lethality in hybrids not carryingD. simulans X, and (3) temperature-sensitive pupal lethality in hybrids carryingD. simulans X. The same lethal phases are also observed when either of the two other sibling species,D. mauritiana orD. sechellia, is employed for hybridization withD. melanogaster. Here, we describe genetic analyses of each hybrid lethality, and demonstrate that these three types of lethality are independent
phenomena. We then propose two models to interpret the mechanisms of each hybrid lethality. The first model is a modification
of the conventional X/autosome imbalance hypothesis assuming a lethal gene and a suppressor gene are involved in the larval
lethality, while the second model is for embryonic lethality assuming an interaction between a maternal-effect lethal gene
and a suppressor gene. |
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Keywords: | Drosophila melanogaster Drosophila simulans hybrid lethality reproductive isolation speciation |
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