K
Koichiro Gen
Researcher at Gunma University
Publications - 73
Citations - 1716
Koichiro Gen is an academic researcher from Gunma University. The author has contributed to research in topics: Japanese eel & Luteinizing hormone. The author has an hindex of 21, co-authored 69 publications receiving 1561 citations.
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Journal ArticleDOI
Effects of Luteinizing Hormone and Follicle-Stimulating Hormone and Insulin-Like Growth Factor-I on Aromatase Activity and P450 Aromatase Gene Expression in the Ovarian Follicles of Red Seabream, Pagrus major
TL;DR: It is indicated that LH, but not FSH, stimulates estradiol-17β production in the ovarian follicle of red seabream through stimulation of aromatase activity and P450arom gene expression and IGF-I enhances the LH-stimulated P450ars gene expression.
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Distribution and seasonal variations in levels of three native GnRHs in the brain and pituitary of perciform fish.
TL;DR: It appears that sbGnRH is physiologically the most important form of GnRH in reproduction in red seabream and, probably, in other perciforms also.
Journal ArticleDOI
Unique Expression of Gonadotropin-I and -II Subunit Genes in Male and Female Red Seabream (Pagrus major) During Sexual Maturation
Koichiro Gen,Koichi Okuzawa,Balasubramanian Senthilkumaran,Hideki Tanaka,Shunsuke Moriyama,Hirohiko Kagawa +5 more
TL;DR: Northern blot analysis showed that Iβ mRNA levels of males increase in association with gonadal development, whereas those of females remain low throughout sexual maturation, indicating sexual dimorphism in the expression pattern of Iβ, suggesting that GTH-I may have important roles in male, but not female, gametogenesis.
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Correlation Between Messenger RNA Expression of Cytochrome P450 Aromatase and Its Enzyme Activity During Oocyte Development in the Red Seabream (Pagrus major)
TL;DR: It is suggested that LH, not FSH, may regulate E2 biosynthesis via increased levels of P450arom mRNA during oocyte development of red seabream.
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A ddRAD-based genetic map and its integration with the genome assembly of Japanese eel (Anguilla japonica) provides insights into genome evolution after the teleost-specific genome duplication
Wataru Kai,Kazuharu Nomura,Atushi Fujiwara,Yoji Nakamura,Motoshige Yasuike,Nobuhiko Ojima,Tetsuji Masaoka,Akiyuki Ozaki,Yukinori Kazeto,Koichiro Gen,Jiro Nagao,Hideki Tanaka,Takanori Kobayashi,Mitsuru Ototake +13 more
TL;DR: Comparisons among the Japanese eel, medaka, zebrafish and spotted gar genomes showed highly conserved synteny among teleosts and revealed part of the eight major chromosomal rearrangement events that occurred soon after the teleost-specific genome duplication.