Bat Genomes Reveal Genetic Secrets Behind Bats' Long Lifespans

A study comparing genomes of eight closely related bat species from the genus Myotis has identified genetic mechanisms potentially explaining their exceptional longevity, despite their small body size. Within this group, lifespan varies significantly, with Myotis nigricans living about 7 years while Myotis brandtii can reach 42 years. Researchers found distinct evolutionary patterns in antiviral defense proteins, with DNA-virus-related genes showing strong natural selection and RNA-virus genes showing copy number changes, contrasting with human evolution. The immune gene PKR showed variable copy numbers across species, but more copies did not simply mean stronger immunity. Additionally, cells from Myotis lucifugus showed enhanced apoptosis in response to DNA damage, a strategy also seen in elephants. Some DNA-damage-response genes overlapped with DNA-virus-interacting proteins, suggesting shared evolutionary foundations. Practical medical applications remain distant, as experiments were mostly on cell cultures with limited samples.