Evolution of GSC regulation in salmonids

2017 Fiscal Year Final Research Report

• Project Area: Mechanisms regulating gamete formation in animals
• Project/Area Number: 25114005
• Research Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
• Allocation Type: Single-year Grants
• Review Section: Biological Sciences
• Research Institution: Tokyo University of Marine Science and Technology
• Principal Investigator: Yoshizaki Goro 東京海洋大学, 学術研究院, 教授 (70281003)
• Project Period (FY): 2013-06-28 – 2018-03-31
• Keywords: ヒメマス / ニジマス / マスノスケ / 生殖細胞 / 代理親魚 / 生殖幹細胞

Outline of Final Research Achievements

Pacific salmon has both semelparous and iteroparous species. Rainbow trout, which is a primitive salmon shows iteroparity and maintained their type-A spermatogonia in their post-spermiated testes. Germ cell transplantation assay revealed that the type-A spermatogonia possessed stem cell population. On the other hand, sockeye salmon, which is an evolved species shows semelparity and did not possess any type-A spermatogonia in their post-spermiated testes. This change was continuous phenomenon and masu salmon and Chinook salmon, which are evolutionally positioned between above-mentioned two species possessed reproductive characteristics somewhere between rainbow trout and sockeye salmon. Germ cell transplantation study also revealed that the iteroparous rainbow trout produced gametes of sockeye salmon and Chinook salmon multiple times in their gonads.

Free Research Field

水族発生工学