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6 March 2014 1:04 pm ,
Vol. 343 ,
Magdalena Koziol, a former postdoc at Yale University, was the victim of scientific sabotage. Now, she is suing the...
Antiretroviral drugs can protect people from becoming infected by HIV. But so-called pre-exposure prophylaxis, or PrEP...
Two studies show that eating a diet low in protein and high in carbohydrates is linked to a longer, healthier life, and...
Considered an icon of conservation science, researchers at World Wildlife Fund (WWF) headquarters in Washington, D.C.,...
The new atlas, which shows the distribution of important trace metals and other substances, is the first product of...
Early in April, the first of a fleet of environmental monitoring satellites will lift off from Europe's spaceport in...
Since 2000, U.S. government health research agencies have spent almost $1 billion on an effort to churn out thousands...
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ScienceShot: Carnivorous Plant Ejects Junk DNA
12 May 2013 1:00 pm
The carnivorous humped bladderwort (Utricularia gibba), found on all continents except Antarctica, is a model of ruthless genetic efficiency. Only 3% of this aquatic plant's DNA is not part of a known gene, new research shows. In contrast, only 2% of human DNA is part of a gene. The bladderwort, named for its water-filled bladders (shown left) that suck in unsuspecting prey, is a relative of the tomato. Since their evolutionary split 87 million years ago, both plants have experienced episodes of genetic duplication where the plants' DNA doubled in size. But while the tomato has held onto a lot of those duplicates, the bladderwort has thrown out anything it doesn't need, and now has a genome only a tenth as long as the tomato's. The finding, published online today in Nature, overturns the notion that this repetitive, non-coding DNA, popularly called "junk" DNA, is necessary for life.
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Correction, 13 May at 10:45 a.m.: The bladderwort and tomato evolutionary split occurred 87 million years ago, not 87,000.