Evolution of symbiotic system in deep-sea Calyptogena clams

2014 Fiscal Year Final Research Report

• Project/Area Number: 24570252
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Evolutionary biology
• Research Institution: Japan Agency for Marine-Earth Science and Technology
• Principal Investigator: YOSHIDA Takao 独立行政法人海洋研究開発機構, 海洋生物多様性研究分野, 主任技術研究員 (60399566)
• Co-Investigator(Renkei-kenkyūsha): TAKAKI Yoshihiro 独立行政法人海洋研究開発機構, 深海・地殻内生物圏研究分野, 主任技術研究員 (10399561) ; SHIMAMURA Shigeru 独立行政法人海洋研究開発機構, 深海・地殻内生物圏研究分野, 技術主事 (40416003)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 共生 / 共進化 / ゲノム解析 / 比較ゲノム

Outline of Final Research Achievements

The objective of this study is to elucidate the coevolution between host animals and their intracellular bacteria (symbiont), and detailed process of reductive genome evolution in intracellular symbiont by using deep-sea Calyptogena clam-symbiont symbiosis as a model. Some hosts and symbiont showed the obscure patterns of coevolution by the phylogenetic tree analysis. We also found that the genome size of their symbionts were approximately 1.5-fold larger than that of previously reported symbionts. These data suggested that reductive genome evolution in Calyptogen symbiont genomes is still in an earlier stage than that in the previously reported symbiont genomes.

Free Research Field

生物分子化学、進化生物学、ゲノム科学