| 荻野 由紀子（おぎの ゆきこ） | データ更新日：2024.04.21 |
准教授 ／
農学研究院
附属国際農業教育・研究推進センター
農学研究院 資源生物科学専攻 動物・海洋生物科学教育コース
| 1. | ＠岡本啓吾、荻野由紀子, メダカの "オスらしさ"の秘密〜アンドロゲン受容体と多様な二次性徴形質の進化について〜, AQUA LIFE, 2024.05. |
| 2. | Yukiko Ogino, Saki Tohyama, Satomi Kohno, Kenji Toyota, Gen Yamada, Ryohei Yatsu, Tohru Kobayashi, Norihisa Tatarazako, Tomomi Sato, Hajime Matsubara, Anke Lange, Charles R. Tyler, Yoshinao Katsu, Taisen Iguchi, Shinichi Miyagawa, Functional distinctions associated with the diversity of sex steroid hormone receptors ESR and AR, Journal of Steroid Biochemistry and Molecular Biology, 10.1016/j.jsbmb.2018.06.002, 2018.11, [URL], Sex steroid hormones including estrogens and androgens play fundamental roles in regulating reproductive activities and they act through estrogen and androgen receptors (ESR and AR). These steroid receptors have evolved from a common ancestor in association with several gene duplications. In most vertebrates, this has resulted in two ESR subtypes (ESR1 and ESR2) and one AR, whereas in teleost fish there are at least three ESRs (ESR1, ESR2a and ESR2b) and two ARs (ARα and ARβ) due to a lineage-specific whole genome duplication. Functional distinctions have been suggested among these receptors, but to date their roles have only been characterized in a limited number of species. Sexual differentiation and the development of reproductive organs are indispensable for all animal species and in vertebrates these events depend on the action of sex steroid hormones. Here we review the recent progress in understanding of the functions of the ESRs and ARs in the development and expression of sexually dimorphic characteristics associated with steroid hormone signaling in vertebrates, with representative fish, amphibians, reptiles, birds and mammals.. |
| 3. | Tsukasa Ryu, Keigo Okamoto, Satoshi Ansai, Miki Nakao, Anu Kumar, Taisen Iguchi, Yukiko Ogino , Gene Duplication of Androgen Receptor As An Evolutionary Driving Force Underlying the Diversity of Sexual Characteristics in Teleost Fishes, Zoological Science, 2024.02, Sexual dimorphism allows species to meet their fitness optima based on the physiological availability of each sex. Although intralocus sexual conflict appears to be a genetic constraint for the evolution of sex-specific traits, sex-linked genes and the regulation of sex steroid hormones contribute to resolving this conflict by allowing sex-specific developments. Androgens and their receptor, androgen receptor (Ar), regulate male-biased phenotypes. In teleost fish, ar ohnologs have emerged as a result of teleost-specific whole genome duplication (TSGD). Recent studies have highlighted the evolutionary differentiation of ar ohnologs responsible for the development of sexual characteristics, which sheds light on the need for comparative studies on androgen regulation among different species. In this review, we discuss the importance of ar signaling as a regulator of male-specific traits in teleost species because teleost species are suitable experimental models for comparative studies owing to their great diversity in male-biased morphological and physiological traits. To date, both in vivo and in vitro studies on teleost ar ohnologs have shown a substantial influence of ars as a regulator of male-specific reproductive traits such as fin elongation, courtship behavior, and nuptial coloration. In addition to these sexual characteristics, ar substantially influences immunity, inducing a sex-biased immune response. This review aims to provide a comprehensive understanding of the current state of teleost ar studies and emphasizes the potential of teleost fishes, given their availability, to find molecular evidence that give rise to spectacular diversity among fish species.. |
| 4. | Shoko Matsushita, Kentaro Suzuki, Aki Murashima, Daiki Kajioka, Alvin Resultay Acebedo, Shinichi Miyagawa, Ryuma Haraguchi, Yukiko Ogino, Gen Yamada, Regulation of masculinization Androgen signalling for external genitalia development, Nature Reviews Urology, 10.1038/s41585-018-0008-y, 2018.06, [URL], The biology of masculinization is fundamentally important for understanding the embryonic developmental processes that are involved in the development of the male reproductive tract, external genitalia, and also the tumorigenesis of prostate cancer. The molecular mechanisms of masculinization are of interest to many researchers and clinicians involved in varied fields, including molecular developmental biology, cancer research, endocrinology, and urology. Androgen signalling is mediated by the nuclear androgen receptor, which has fundamental roles in masculinization during development. Various modes of androgen signalling, including 5α-dihydrotestosterone-induced regulation of mesenchymal cell proliferation, have been observed in masculinization. Such regulation is essential for regulating urogenital tissue development, including external genitalia development. Androgen-induced genes, such as MAFB, which belongs to the activator protein 1 (AP-1) superfamily of genes, have essential roles in male urethral formation, and disruption of its signalling can interfere with urethral formation, which often results in hypospadias. Another AP-1 superfamily gene, ATF3, could be responsible for some instances of hypospadias in humans. These androgen-dependent signals and downstream events are crucial for not only developmental processes but also processes of diseases such as hypospadias and prostate cancer.. |
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