Bat DNA Holds Key to Understanding Human Longevity and Immune Defense

Genetic research published in Nature suggests that the secrets to extended human lifespan may lie within the DNA of bats. These mammals are capable of living significantly longer than other species of similar size, a trait now linked by scientists to a highly efficient immune system that suppresses both cancer and infectious diseases.

Lead researcher Juan Manuel Vazquez, formerly a postdoctoral fellow at UC Berkeley and now at Pennsylvania State University, spearheaded the study after becoming fascinated with bat longevity during his graduate studies at the University of Chicago. Recognizing the scarcity of genomic data at the time, he began collecting tissue samples from bat species across the western United States. Assisted by undergraduate students, the team utilized mist nets near water sources to capture bats, primarily from the Myotis genus, to sequence their DNA.

The analysis of eight Myotis genomes identified a strong correlation between lifespan and immune function. Longer-lived bat species exhibited higher activity in genes associated with cancer suppression. “Bats evolved to live for a long time without getting diseases, which suggests that we don’t necessarily need to look at diseases of aging and diseases of infection as completely separate fields,” Vazquez explained. He noted that understanding these mechanisms could help humans develop strategies to maintain immune efficacy throughout old age.

In laboratory experiments, Vazquez exposed cells from 259 individuals across 32 species to toxic chemicals. The cells from the little brown bat (Myotis lucifugus), one of North America’s longest-lived bats, responded unexpectedly. Rather than attempting to repair damaged DNA, the cells activated genes that triggered cell death. “The longest-lived bat in North America decides ‘I can’t save this ship’ and immediately switches gears to prioritize killing off the cells that are damaged,” Vazquez said. This self-destructive strategy mirrors that of elephants, another cancer-resistant, long-lived species.

Peter Sudmant, an associate professor of integrative biology at Berkeley, highlighted the potential for these findings to illuminate the relationship between DNA damage and immune response. “If you start looking at long-lived species like elephants, whales and bats, you start finding ways that nature has actually already resolved a lot of these problems in human health,” he said.

The study also uncovered a significant genetic overlap between longevity and viral defense. Collaborator Elise Lauterbur, formerly at the University of Arizona and now at the University of Vermont, found that genes associated with lifespan frequently matched those involved in interactions with viruses. Bats possess an expanded repertoire of proteins that interact with DNA viruses, such as herpesviruses, which may enhance interferon production and other antiviral defenses.

This evolutionary divergence may explain why bat-borne viruses can be particularly dangerous to humans. While bats have adapted to host viruses without severe illness, humans lack compatible immune defenses. Vazquez warned that the mismatch creates a two-way risk for zoonotic disease transmission. “Humans and bats are badly suited to each other,” he stated.

Bats, which emerged approximately 60 million years ago, now comprise 20% of all mammal species. Within the Myotis genus, lifespan varies dramatically; Brandt’s myotis can live up to 50 years, while the black myotis lives only about seven. Researchers attribute the bats’ robust health partly to their intense physical activity, comparing nightly hunting flights to humans running multiple ultramarathons daily.

The research was funded by the National Institutes of Health and the National Science Foundation. Co-authors included Lucie Etienne of the École Normale Supérieure in Lyon, France, and David Enard of the University of Arizona.