April 11, 2026
Bigger brains may seem like they're only good for boosting intelligence, but according to a new study from the University of Bath, they're also linked to stronger immune systems and longer lives. The remarkable research, published in Scientific Reports, analyzed the genomes of 46 mammal species, including cats, pandas and dolphins. The results show that longer lifespans are associated with an expansion of immune-related gene families and larger relative brain sizes, especially in mammals such as humans, elephants and primates.
“We found 236 gene families that show significant positive correlations with maximum lifespan potential across the mammalian evolutionary tree,” the researchers said. “Genes in these families are richly represented in functional annotations of the immune system and have previously been associated with aging and lifespan.” Maximum lifespan potential refers to the age that the longest-living individual within a species can reach, something that can vary greatly. Unlike average lifespan, which is influenced by factors such as war, predators, or disease, MLSP reflects the biological limits of a species.
According to data from the World Health Organization, the average life expectancy for humans in 2021 was 71,3 years. Currently, the oldest living human is 115-year-old Ethel Caterham from the United Kingdom, born in 1909. The oldest person ever recorded was Jeanne Calment from France, who lived to be 122. For comparison, the average life expectancy of a dog is typically between 10 and 13 years. Spike, the verified oldest living dog, is a 25-year-old Chihuahua mix from the United the stateThe oldest dog ever, an Australian cattle dog named Bluey, reached the age of 29.
Research into the relationship between brain size and lifespan goes back decades. Scientists believe that discovering the genetic basis of MLSP could reveal how evolution shapes aging by affecting cellular deterioration and energy metabolism. In their study, the researchers took into account physical traits such as body and brain size and life history factors such as age at maturity and gestation when analyzing the genetic patterns that influence the evolution of lifespan.
The researchers found that the genes associated with MLSP were more active in humans and could be used in different ways to produce different proteins, suggesting that both the level of gene activity and the flexibility in gene use can contribute to longer lifespan. Furthermore, many of these genes have already been linked to human aging, suggesting possible shared biological patterns between species-specific lifespan and individual aging.
The study's findings suggest that immune system function and brain size play a crucial role in the evolution of longevity. The same genetic mechanisms could be responsible for lifespan differences between species and within humans. "These new discoveries improve our understanding of the mechanisms underlying the aging process," the researchers emphasize. "Given the reversible nature of epigenetic data, these questions illuminate promising avenues for therapeutic interventions in aging and age-related diseases, such as cancer.”
How do brain size and lifespan relate to each other?
The study found that larger brains were associated with stronger immune responses and longer lifespans, suggesting that brain size influences the genetic mechanisms that determine lifespan.
What is the maximum lifespan potential?
Maximum lifespan potential refers to the age that the longest-living individual within a species can reach, as opposed to average lifespan, which is influenced by external factors.
Can gene research help us understand aging?
Yes, the research lays the foundations for therapeutic interventions in aging and age-related diseases by focusing on the genetic mechanisms that influence life and aging.
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