The Immortal Jellyfish

There is a species of small jellyfish that will, when it is sick or injured, instead of dying, fully regenerate itself. It will sink “to the bottom of the ocean floor, where its body folds in on itself—assuming the jellyfish equivalent of the fetal position. The bell reabsorbs the tentacles, and then it degenerates further until it becomes a gelatinous blob. Over the course of several days, this blob forms an outer shell. Next it shoots out stolons, which resemble roots.” These stolons grow into new jellyfish.

Turritopsis dohrnii  (Wikipedia)

The description is from Nathaniel Rich’s article in the New York Times Magazine (Dec. 2, 2012). Over two years, one lab colony of such jellyfish rebirthed itself ten times. The jellyfish’s official name is Turritopsis dohrnii; its nickname, the Benjamin Button jellyfish. As different from humans as it may look, our genetic makeups are similar.

The immortal jellyfish is a specialty of Dr. Shin Kubota at Kyota University’s Seto Marine Biological Laboratory. Dr. Kubota spends much of his days feeding, caring for, and observing his wards. His expressed goal is to become young again himself, perhaps even to achieve immortality, or at least to point a way towards a cure for cancer.

We think of dying as a boundary that all living things share, part of the definition of being alive. But death is not so absolute. Clichés such as “you live and then you die” and “life is short” inadvertently call all the more attention to their exceptions. Bacteria, for example, don’t always die; they often divide. An individual bacterium may be destroyed or die from illness, injury, or antibiotics, but usually bacteria divide (or is it multiply?) into identical clones, which in turn will divide again.

And as for life being “short,” Buffalo grass, a prairie plant resistant to extreme weather, sprouts underground stems which in some locations may have been growing for the last 15,000 years. Among individual plants, the Bristlecone Pine named “Methuselah” still grows in California as it approaches its 5000th birthday. And Wikipedia’s lengthy “List of longest-living organisms” is not only long itself but has spawned the likes of “List of oldest dogs.”

I can understand that words for death and dying help people share their fears and grief when one of their group passes away from the circle of the living. And I can understand the simultaneous desire to imagine that that person is not “really dead” but is still alive in another realm. But perhaps we don’t need to reach into a spiritual world for such consolation. We might take to heart the models here on Earth of how living, reproducing, self-healing, and dying vary so widely among species.

 

 

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