new paper in Genomic biology and evolution He points out that a species of octopus appears to have evolved independently to develop something like a shell, despite the loss of the genetic code that produced actual shells in its ancestors and relatives.
Argonauta argo is a species of octopus that lives in tropical and subtropical open seas. The female argon has a protective, spiral-like shell-like egg shell that protects the eggs inside. Researchers have long wondered about the origin of this egg condition. It is very similar to the well-known pearl nautilus shell (very close to the argonaut), which has a real hard shell and lives on the ocean floor, but that may just be a coincidence.
While the argon egg shell and nautilus shell are formed by secretion of proteins, they have been reported to be shaped differently and look different at the microscopic level. Did the egg shell evolve from the shell, or did it develop independently?
By sequencing a draft of the species’ genome, a team of researchers from Japan, led by Masa Aki Yoshida and Davin Setiamarga, attempted to reveal the genomic background of the argonauts and show how the species adapted to the open ocean and acquired its shell-like shape. egg case. Scientists had previously avoided targeting argon because it was difficult to keep animals in aquariums for research purposes. But here the authors had access to a site in the Sea of Japan that was ideal for obtaining new samples.
The new genome data revealed here provide insight into several features related to shell development and egg shell formation. The researchers found egg-state protein-coding genes in argonauts and discovered that most of these genes were not used to form shells in distantly related species, including the nautilus. This indicates that although the distant ancestors of octopuses likely had shells, the shells did not develop into egg shells.
“The argonaute genome is particularly intriguing because it shows that the reported structural fracture in the known octopus genome is not a general feature of this group,” Yoshida and Setiamarga said. “We have shown that contrary to popular belief, cephalopods do not necessarily show distinct genetic evolution. We expect that our results will advance research into the evolution of the genomes of metazoans, mollusks, and cephalopods, which have remained largely unexplored until now.”
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Masa-aki Yoshida et al, The processes of gene recruitment and rejection in the argonaute genome provide insights into marine lifestyle adaptation and shell-like egg reacquisition, Genomic biology and evolution (2022). DOI: 10.1093/Evacuation/Evacuation 140
Foreword by Oxford University Press
the quote: New Research Shows How Octopuses Evolve (2022, Oct 26), Retrieved Oct 26, 2022 from https://phys.org/news/2022-10-octopuses-evolved.html
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