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Telomerase Expression Linked To Body Mass

squirrel to be an increased risk for cancer.

Body mass, however, showed a clear correlation across the 15 species. The capybara, nearly the size of a grown human, was not expressing telomerase, suggesting evolution was willing to forgo the benefits in order to reign in cancer.

The results cannot be directly related to humans, but Gorbunova set up the study to produce very strong across-the-board indicators. It's clear that evolution has found that the length of time an organism is alive has little effect on how likely some of its cells might mutate into cancer. Instead, simply having more cells in your body does raise the specter of cancer-and does so enough that the benefits of telomerase expression, such as fast healing, weren't worth the cancer risk.

Gorbunova points out that these findings raise another, perhaps far more important question: What, then, does this mean for animals that are far larger than humans? If a 160-pound human must give up telomerase to thwart cancer, then what does a 250,000-pound whale have to do to keep its risk of cancer at bay?

"It may be that whales have a cancer suppressant that we've never considered," says Gorbunova. "I'd like to find out what kind of telomerase expression they have, and find out what else they use to combat cancer."

As for the tiny mice: "They don't have to worry about cancer," she says. "They're probably all praying for an anti-cat gene."

Source-Eurekalert
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