Tweaking certain genes causes female flies to make more offspring and live longer. The implications for humans are not yet clear. Scientists have long thought that "the more you reproduce, the shorter you're going to live," said John Tower, associate professor of biological sciences at University of Southern California. True, sometimes, Tower said today. Tower and graduate student Yishi Li found genes that could make older flies lay more eggs. When older female flies were altered to over-express the genes, they produced more offspring and lived 5 to 30 percent longer. Tower speculates the genes are boosting activity of stem cells in the flies' reproductive system. Otherwise, stem cell activity declines with age, and reproduction in older flies could not happen without a return of stem cells to peak form.
The Prairie Pooch Hole
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