Gene discovery prevents weight gain with a high-sugar diet

Gene discovery prevents weight gain with a high-sugar diet
C. elegans, a one-millimeter-long worm that scientists have used as a model organism since the 1970s. Courtesy of the Curran Laboratory

Imagine being able to take a pill that lets you eat all of the ice cream, cookies, and cakes that you wanted – without gaining any weight.

New research from USC suggests that dream may not be impossible. A team of scientists led by Sean Curran of the USC Davis School of Gerontology and the Keck School of Medicine of USC found a new way to suppress the obesity that accompanies a high-sugar diet, pinning it down to a key gene that have already developed drugs to target.

So far, Curran's work has been solely on the worm Caenorhabditis elegans and human cells in a – but the genetic pathway he studied is found in almost all animals from yeast to humans. Next, he plans to test his findings in mice.

Curran's research is outlined in a study that will be published on Oct. 6 by Nature Communications.

Building on previous work with C. elegans, Curran and his colleagues found that certain genetic mutants – those with a hyperactive SKN-1 gene – could be fed incredibly high-sugar diets without gaining any weight, while regular C. elegans ballooned on the same diet.

"The high-sugar diet that the bacteria ate was the equivalent of a human eating the Western diet," Curran said, referring to the diet favored by the Western world, characterized by high-fat and high-sugar foods, like burgers, fries and soda.

The SKN-1 gene also exists in humans, where it is called Nrf2, suggesting that the findings might translate, he said. The Nrf2 protein, a "transcription factor" that binds to a specific sequence of DNA to control the ability of cells to detox or repair damage when exposed to chemically reactive oxygen (a common threat to cells' well being), has been well studied in mammals.

Pharmaceutical companies have already worked to develop small-molecule drugs that target Nrf2, in hopes that it will produce more anti-oxidants and slow aging.

Though the promise of a pill to help control your body's response to food is enticing, it is not without risk, Curran said. Increased Nrf2 function has been linked to aggressive cancers.

"Perhaps it is a matter of timing and location," Curran said. "If we can acutely activate Nrf2 in specific tissues when needed then maybe we can take advantage of its potential benefits."


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Scientists find genetic mechanism linking aging to specific diets

Journal information: Nature Communications

Citation: Gene discovery prevents weight gain with a high-sugar diet (2014, October 6) retrieved 18 July 2019 from https://phys.org/news/2014-10-gene-discovery-weight-gain-high-sugar.html
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Oct 06, 2014
Increased Nrf2 function has been linked to aggressive cancers.
Is that all? And here I was worried it would be dangerous. Sign me up.

Oct 07, 2014
No really, SKN-1, the skinny gene?!

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