| Budget Amount *help |
¥105,300,000 (Direct Cost: ¥81,000,000、Indirect Cost: ¥24,300,000)
Fiscal Year 2021: ¥21,970,000 (Direct Cost: ¥16,900,000、Indirect Cost: ¥5,070,000)
Fiscal Year 2020: ¥21,970,000 (Direct Cost: ¥16,900,000、Indirect Cost: ¥5,070,000)
Fiscal Year 2019: ¥21,970,000 (Direct Cost: ¥16,900,000、Indirect Cost: ¥5,070,000)
Fiscal Year 2018: ¥21,970,000 (Direct Cost: ¥16,900,000、Indirect Cost: ¥5,070,000)
Fiscal Year 2017: ¥17,420,000 (Direct Cost: ¥13,400,000、Indirect Cost: ¥4,020,000)
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| Outline of Final Research Achievements |
Sex chromosomes of many species are dimorphic due to suppression of recombination. However, the initial process of recombination suppression has been elusive. In this study, we analyzed the initial process of sex chromosome evolution using a group of fish species that are expected to have chromosomes before and after the dimorphism. We confirmed that Yellowtail fishes have sex chromosomes before and after recombination suppression. Although sex chromosome inversion has been regarded as the main cause of recombination suppression, no inversion was observed in Yellowtail fishes, suggesting the existence of a novel recombination inhibition mechanism. We also identified candidate mutations that caused recombination suppression. In pufferfishes, we found that sex-determining regions containing multiple genes moved around in the genome, and proposed the hypothesis that recombination repression is the cause of this phenomenon.
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