New research indicates that the genetic makeup of bats may offer insights into extended lifespans and resistance to diseases like cancer. Scientists analyzed the genomes of eight bat species from the Myotis genus, known for their exceptional longevity relative to their size. The study highlights a strong correlation between a bat's lifespan and the effectiveness of its immune system.
Longer-lived bat species exhibit higher levels of genes associated with combating cancer. This suggests that a robust immune system, capable of defending against both infectious agents and cancerous cells, contributes significantly to longevity. Researchers observed considerable overlap between genes linked to aging and those involved in disease defense, indicating these processes may be interconnected.
Laboratory experiments on bat cells revealed unique responses to damage. When exposed to toxic chemicals, cells from the little brown bat, a long-lived species, prioritized self-destruction over DNA repair. This strategy, also observed in elephants, suggests that eliminating damaged cells quickly may prevent them from becoming dangerous, offering a novel approach to understanding longevity.
Bats possess an unusually active immune system that manages inflammation and allows them to host viruses without succumbing to illness. This powerful immunity may be linked to their high metabolic rates from nightly flights. The study also found that genes associated with bat longevity frequently overlap with genes involved in bat-virus interactions.
Myotis bats have a high number of genes that produce proteins interacting with DNA viruses, such as herpes viruses. This differs from humans and other primates, which tend to have more genes interacting with RNA viruses like those causing COVID-19 and HIV. This evolutionary mismatch in immune defenses may explain why some bat viruses can cause severe zoonotic diseases in humans.
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