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Researchers Study Sea Creature that Could Live Forever
Scientists in Spain have mapped the genetic1 code of a sea animal that is the only known creature able to go back in its life cycle.
The research involves a kind of jellyfish. The researchers' goals were to try to understand the secret of the jellyfish's unusual long life and find new areas for future aging research.
The scientists published their study recently in the Proceedings2 of the National Academy of Sciences. Maria Pascual-Torner, Victor Quesada and others at the University of Oviedo mapped the genetic code of Turritopsis dohrnii. It is the only known species of jellyfish able to repeatedly change back into a larval stage after sexual reproduction. The scientists said that means it could be biologically immortal3.
Like other jellyfish, T. dohrnii goes through a two-part life cycle. It lives on the sea floor during an early part of life where its main goal is to survive during times when there is not enough food. Then, when conditions are right, the jellyfish enters another part of its life to reproduce sexually.
Many kinds of jellyfish have some ability to reverse aging and go back to a larval form. But most lose this ability once they reach sexual maturity4, the scientists wrote.
Not so for T. dohrnii.
Monty Graham is a jellyfish expert and director of the Florida Institute of Oceanography. Graham was not involved in the research.
"We've known about this species being able to do a little evolutionary5 trickery for maybe 15-20 years," he said.
In this case, trickery means an unusual behavior or manner.
This trick earned the species the nickname, the immortal jellyfish. Graham admits the nickname is a little hyperbolic, meaning it overstates the truth.
The study aimed to understand what made this jellyfish different. It compared the genetic code of T. dohrnii to a close genetic relative that does not have the same ability.
Researchers found that T. dohrnii has differences in its genes6 that may make it better at copying and repairing DNA7. Such differences, or variations, also appear to make the jellyfish better at taking care of the ends of chromosomes8 called telomeres. In humans and other species, telomere length has been shown to shorten with age.
Graham said the research has no immediate9 financial value.
"We can't look at it as, hey, we are going to harvest these jellyfish and turn it into a skin cream," he said.
The research has more to do with understanding the processes that help these jellyfish live so long.
Graham explained, "It's one of those papers that I do think will open up a door to a new line of study that's worth pursuing."
Words in This Story
code – n. a set of instructions for a living organism or a computer
life cycle -- n. the series of stages through which a living thing passes from the beginning of its life until its death
species – n. biology : a group of animals or plants that are similar and can produce young animals or plants : a group of related animals or plants that is smaller than a genus
larval – adj. a very young form of an insect or other creature
immortal – adj. not capable of dying ; living forever
pursue –v. to make an effort to find out more about some subject or issue
1 genetic | |
adj.遗传的,遗传学的 | |
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2 proceedings | |
n.进程,过程,议程;诉讼(程序);公报 | |
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3 immortal | |
adj.不朽的;永生的,不死的;神的 | |
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4 maturity | |
n.成熟;完成;(支票、债券等)到期 | |
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5 evolutionary | |
adj.进化的;演化的,演变的;[生]进化论的 | |
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6 genes | |
n.基因( gene的名词复数 ) | |
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7 DNA | |
(缩)deoxyribonucleic acid 脱氧核糖核酸 | |
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8 chromosomes | |
n.染色体( chromosome的名词复数 ) | |
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9 immediate | |
adj.立即的;直接的,最接近的;紧靠的 | |
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