Analysis of early developments in a viviparous fish Xenotoca eiseni

• Project/Area Number: 24657161
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Single-year Grants
• Research Field: Evolutionary biology
• Research Institution: Kyoto University
• Principal Investigator: IIDA Atsuo 京都大学, 再生医科学研究所, 助教 (90437278)
• Project Period (FY): 2012-04-01 – 2014-03-31
• Project Status: Completed (Fiscal Year 2013)
• Budget Amount: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000); Fiscal Year 2013: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000); Fiscal Year 2012: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
• Keywords: 胎生 / 魚類 / 繁殖 / 初期発生 / アポトーシス

Research Abstract

I analyzed a mechanism of non-mammalian viviparous system using a live-bearer teleost Xenotoca eiseni. The viviparous fish doesn't possess defined analog of fetal organs corresponding to a placenta and an umbilical cable of mammals. They have unique ribbon-like structure elongated from a perianal. This structure is presumed to be a functional analog of the fetal organ of mammals, which plays a role for absorption of maternal nutrients. I found that the ribbon-like structure of the fetal fry is disrupted by programed cell death in perinatal stage. Such regression mechanism has not reported in mammals. It was presumed to be a unique system in viviparous fish.

Research Products

• [Presentation] 胎生魚ハイランドカープXenotoca eiseniにおける胎仔の発生 (2013)
  • Author(s): 飯田敦夫,徳増雄大,西槇俊之
  • Organizer: 第10回水生動物の行動と神経系シンポジウム
  • Place of Presentation: 鹿児島大学理学部
• [Presentation] 胎生魚ハイランドカープXenotoca eiseni における胎仔の発生 (2013)
  • Author(s): 飯田敦夫
  • Organizer: 第10回水生動物の行動と神経系シンポジウム
  • Place of Presentation: 鹿児島大学
• [Book] New Principles in Developmental (2014)
  • Author(s): Atsuo Iida, 他
  • Publisher: Processes Springer
• [Remarks]
  • URL: http://www.frontier.kyoto-u.ac.jp/rc03/member/iida.html