Genetic background of of re-evolution of shells in Argonaut octopuses

About This Project

Japan Grant Number
JP18K06363 (JGN)
Funding Program
Grants-in-Aid for Scientific Research
Funding Organization
Japan Society for the Promotion of Science

Kakenhi Information

Project/Area Number
18K06363
Research Category
Grant-in-Aid for Scientific Research (C)
Allocation Type
  • Multi-year Fund
Review Section / Research Field
  • Basic Section 45020:Evolutionary biology-related
Research Institution
  • Shimane University
Project Period (FY)
2018-04-01 〜 2021-03-31
Project Status
Completed
Budget Amount*help
4,290,000 Yen (Direct Cost: 3,300,000 Yen Indirect Cost: 990,000 Yen)

Research Abstract

Argonautids are a type of octopus that has lost the outer shell of mollusks, but they secrete calcium-binding proteins from their arms to form a magnificent shell. Other molluscs secrete their shells from dorsal shell glands, which is ectopic to the Argonautids, indicating that the Argonautids re-evolved their shell-forming ability in a different place than other molluscs. Analysis of the proteins in the shells of Argonautids revealed three shell-forming proteins known from other molluscs, indicating that shell matrix proteins are conserved in the genome of the ancestral octopuses, which did not have shells, and that shell re-evolution occurs by using different genes in different cases.

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