The Curious Octopus

Octopus 1

The octopus’ abilities seem downright otherworldly. In fact, a number of scientists writing in the Progress in Biophysics and Molecular Biology have proposed literally that octopuses come from another planet through a process called “panspermia” where “microbes, viruses and even tiny life forms like the tardigrade might travel dormant from space rock to space rock via collisions, eventually making their way to new planets” (though the consensus in the marine biology community is that such a conjecture is “fanciful”).

But sometimes truth is stranger than fiction and the actual mechanism for many of the octopus’ extraordinary capabilities has to do with maybe its strangest trick of all – changing its own genetic material. Scientific American’s article “Curiouser and Curiouser–Octopus’s Evolution Is Even Stranger Than Thought” described the bizarre genetic sleight of hand of the octopus…

  • “These aquarium oddities can modify the proteins found in their bodies without having to change the basic sequence of their DNA blueprint…The new paper reports on a process called ‘RNA editing,’ which involves enzymes swapping out one RNA base (or nitrogen-based “letter” in the RNA/DNA alphabet) for another, presumably in the interest of an organism adapting to its environment. RNA editing is rarely employed in most animals…’No one knows why cephalopods are so keen on RNA editing. Perhaps it is a faster, easier way to adapt to their environment than waiting for a random mutation to occur. Or maybe it better suits their relatively short life spans. Cephalopods grow up fast and die young . Most live only for a few years and they only breed once. Ragsdale feels RNA editing may help them navigate what are often lonesome, fleeting lives. ‘This may explain why they’re such good problem solvers. No one’s around to show them how to figure out the world!’ Ragsdale says, ‘How to make their dens. How to camouflage themselves and attack prey. They’re on their own, and fortunately for them they have big brains and can sort matters out’.”

For a stunning example of self-camouflage, beyond the colour and even texture changing trickery of their skin, check out Blue Planet’s piece on their sub-aquatic sartorial skills…

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