Kyushu University Academic Staff Educational and Research Activities Database
List of Presentations
Yukiko Ogino Last modified date:2019.06.10

Associate Professor / Attached Promotive Center for International Education and Research of Agriculture / Faculty of Agriculture

1. Yukiko Ogino, Hirotaka Sakamoto, Eiji Watanabe, Satoshi Ansai, Kiyoshi Naruse and Taisen Iguchi, Functional analysis of two distinct paralogs of androgen receptor for the sex characteristics development in medaka, 52th Annual Meeting of the Japanese Society of Developmental Biologists, 2019.05.
2. Yukiko Ogino, Hirotaka Sakamoto, Eiji Watanabe and Taisen Iguchi, Diversification of androgen receptor function underlies secondary sex characteristics development of teleost fishes. , 4th Strategic Meeting for Medaka Research,3rd Regional Fish Meeting, 2018.04, Gene duplication is a dominant driving force of evolution. Steroid hormone receptor gene family is thought to have arisen from gene duplication. However, the molecular events which produce new protein functions after the genome duplication have not been fully understood. Teleost fishes present a good model to investigate an accurate evolutionary history of protein function after whole genome duplication, because the teleost-specific whole genome duplication (TSGD) 350 million years ago resulted in a variety of duplicated genes that exist in modern fishes. We focused on the androgen receptor (AR) gene, since two different subtype genes, AR and AR, were generated in the TSGD. AR has retained the ancestral function, whereas the AR evolved as a hyperactive form of AR in the teleost lineage. Results of our combined functional and 3 dimensional analyses of medaka (Oryzias latipes) ARs identified the substitutions that led to changes in protein structure and function between medaka AR and AR. One substitution located within the helices 10/11 of ligand binding domain is sufficient for generating higher transactivation of AR. This amino acid change affects the stability of ligand binding by modifying the hydrogen bonds between ligand and AR.
To further address the functional differences between AR and AR in vivo, we isolated the nonsense mutants of AR and AR from the medaka tilling library. AR have predominant function for external masculine phenotypes, and AR might participate the development of traits for male-male competition. Our findings would provide an historical explanation for the retention of the duplicated AR copies in euteleost genome..
3. 荻野 由紀子, 井口泰泉, Evolutionary diversification of androgen dependent sex characteristics development in teleost fishes., The 22nd International Congress of Zoology, 2016.11.
4. 荻野 由紀子, Functional and evolutionary analyses of androgen receptor gene in teleost fishes: Molecular basis of diversified sex characteristics development, 小型魚類研究会, 2016.08.