Abstract
In the cross between Drosophila melanogaster females and D. simulans males, hybrid males die at the late larval stage, and the sibling females also die at later stages at high temperatures. Removing the D. simulans allele of the Lethal hybrid rescue gene (Lhr sim) improves the hybrid incompatibility phenotypes. However, the loss-of-function mutation of Lhr sim (Lhr sim0) does not rescue the hybrid males in crosses with several D. melanogaster strains. We first describe the genetic factor possessed by the D. melanogaster strains. It has been suggested that removing the D. melanogaster allele of Lhr (Lhr mel), that is Lhr mel0, does not have the hybrid male rescue effect, contrasting to Lhr sim0. Because the expression level of the Lhr gene is known to be Lhr sim > Lhr mel in the hybrid, Lhr mel0 may not lead to enough of a reduction in total Lhr expression. Then, there is a possibility that the D. melanogaster factor changes the expression level to Lhr sim < Lhr mel. But in fact, the expression level was Lhr sim > Lhr mel in the hybrid irrespectively of the presence of the factor. At last, we showed that Lhr mel0 slightly improves the viability of hybrid females, which was not realized previously. All of the present results are consistent with the allelic asymmetry model of the Lhr gene expression in the hybrid.
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Acknowledgments
We are grateful to the Bloomington, Kyoto, and Ehime Drosophila stock centers, T. Miyo, T. Orr-Weaver, J. Roote, and M. T. Yamamoto for providing fly strains. We thank J. Kitano, A. Ishikawa, and R. Niwa for facility help and technical advice. This work was partly supported by Grants-in-Aid for Scientific Research (21570001 and 24570001) to KS from the Japan Society for the Promotion of Science and NIG Collaborative Research Program (2012-A83) from the National Institute of Genetics to KS, TTS, and J. Kitano. Comments from two anonymous reviewers improved this report.
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Shirata, M., Araye, Q., Maehara, K. et al. Allelic asymmetry of the Lethal hybrid rescue (Lhr) gene expression in the hybrid between Drosophila melanogaster and D. simulans: confirmation by using genetic variations of D. melanogaster . Genetica 142, 43–48 (2014). https://doi.org/10.1007/s10709-013-9752-3
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DOI: https://doi.org/10.1007/s10709-013-9752-3