Bats are biological outliers: some live 40+ years despite weighing only a few grams, far outliving mice or rats of similar size. They also tolerate viruses (like coronaviruses) that would kill other mammals, without getting sick. This raises a fundamental question: are these traits connected, and what genetic changes enable them? This preprint from Vazquez, Sudmant, and colleagues tackled that question by comparing genomes of 8 closely related Myotis bat species with known lifespan variation (ranging from ~5 to 35+ years).
The researchers generated high-quality genome assemblies and cell lines from these species, then conducted genome-wide screens for positive selection—genetic changes that have been consistently favored by evolution. They also examined structural variations (large insertions, deletions, duplications) and ran functional experiments in primary bat cells. The key finding: bats show widespread positive selection in genes involved in DNA virus interaction, which is unusual compared to other mammals. Separately, they found high rates of copy number variation in RNA virus genes. Most intriguingly, they identified distinct evolutionary pathways: DNA virus adaptation appears to involve point mutations (positive selection), while RNA virus adaptation uses structural duplication/deletion strategies.
They also discovered pervasive positive selection in cancer-related pathways across long-lived Myotis species, and demonstrated that primary cells from the longest-lived species (M. lucifugus, living 40+ years) show unique DNA damage responses. The authors propose a "pleiotropic" mechanism—meaning the same genes that help bats tolerate viruses without mounting destructive immune responses also suppress cancer and support DNA repair, thereby extending lifespan.
Limitations are important to note: this is a preprint (not yet peer-reviewed), which means claims have not undergone formal expert scrutiny. The sample is relatively small (8 species, likely <50 individuals total), and functional experiments are limited to cell culture—not whole-organism studies. The mechanistic link between virus tolerance and longevity remains correlative; causality has not been proven. Additionally, findings from bats may not directly translate to humans, although understanding the principles could inform drug discovery.
Why this matters for longevity research: if virus tolerance and longevity are genuinely linked through immune regulation, this could open new avenues for geroprotective drugs that dampen chronic inflammation without compromising infection defense. It also provides a natural experiment showing that extreme longevity *without* caloric restriction or other known interventions is possible, hinting at alternative biological pathways. However, readers should treat these findings as promising preliminary work requiring replication in peer-reviewed form and functional validation before drawing clinical conclusions.
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