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Scientists Extend Life of Flies by 60 Per Cent

Scientists have managed to prolong the lifespan of flies by up to 60 per cent after activating a gene which destroys unhealthy cells, an advance which may help develop new anti-ageing treatments for humans.

Researchers at the University of Bern in Switzerland, led by Eduardo Moreno, have developed a new method to extend lifespan of flies based on improved selection of the best cells within the body. “Our bodies are composed of several trillion cells and during ageing those cells accumulate random errors due to stress or external insults, like UV-light from the sun,” said Moreno. “Because some cells are more affected than others, we reasoned that selecting the less affected cells and eliminating the damaged ones could be a good strategy to maintain tissue health and therefore delay ageing and prolong lifespan,” Moreno said.

To test their hypothesis, the researchers used Drosophila melanogaster flies. The first challenge was to find out which cells within the organs of Drosophila were healthier. Moreno’s team identified a gene which was activated in less healthy cells.

They called the gene ahuizotl (azot) after a mythological Aztec creature selectively targeting fishing boats to protect the fish population of lakes, because the function of the gene was also to selectively target less healthy or less fit cells to protect the integrity and health of the organs like the brain or the gut.

Normally, there are two copies of this gene in each cell. By inserting a third copy, the researchers were able to select better cells more efficiently. The consequences of this improved cell quality control mechanism were, according to Moreno, “very exciting.” The flies appeared to maintain tissue health better, aged slower and had longer lifespans.

“Our flies had median lifespans 50 to 60 per cent longer than normal flies,” said Christa Rhiner, one of the authors of the study. Because the gene azot is conserved in humans, this opens the possibility that selecting the healthier or fitter cells within organs could in the future be used as an anti ageing mechanism, researchers said. The study is published in the journal Cell.

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