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17 April 2014 12:48 pm ,
Vol. 344 ,
Officials last week revealed that the U.S. contribution to ITER could cost $3.9 billion by 2034—roughly four times the...
An experimental hepatitis B drug that looked safe in animal trials tragically killed five of 15 patients in 1993. Now,...
Using the two high-quality genomes that exist for Neandertals and Denisovans, researchers find clues to gene activity...
A new report from the Intergovernmental Panel on Climate Change (IPCC) concludes that humanity has done little to slow...
Astronomers have discovered an Earth-sized planet in the habitable zone of a red dwarf—a star cooler than the sun—500...
Three years ago, Jennifer Francis of Rutgers University proposed that a warming Arctic was altering the behavior of the...
- 17 April 2014 12:48 pm , Vol. 344 , #6181
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ScienceShot: Who Needs Sex When You Can Steal?
No animal has gone completely without sex for as long as bdelloid rotifers, who have been celibate for millions of years. The always female, translucent, and half-a-millimeter long creatures perplex evolutionary biologists, who believe that combining the DNA of two parents is necessary to create the genetic diversity that animal populations need to adapt to a changing environment. (Bacteria manage to diversify without sex because genes can easily jump from one bacterium to another.) Yet with more than 460 species, bdelloid rotifers have managed to survive and diversify over evolutionary time too. So how do they do it? They may do it by "stealing" genes from other organisms. Reporting online today in Nature, researchers have found that the genome of the bdelloid rotifer Adineta vaga (electron microscope image, above) contains an unusual amount of DNA from other organisms that appears to have "jumped" in through a process called horizontal gene transfer that occurs often in asexual bacteria, but very rarely in animals. About 8% of Adineta's genes derive from bacteria and other nonanimal kingdoms of life. The authors suggest that fraction helps keep their populations genetically diverse and adaptable—no whoopee required.