While humans may not achieve eternal life, a recent study suggests we could potentially live up to an average age of 200. This groundbreaking research indicates that even if all other aging factors were eradicated, the inevitable accumulation of genetic changes could eventually hinder organ function.
The findings indicate that the human lifespan could range from 146 to 194 years, with some individuals possibly reaching beyond 550 years. Conducted by researchers at the Skolkovo Institute of Science and Technology in Moscow, the study aims to deepen our understanding of the factors influencing aging, directing focus toward those that could extend our lifespan.
This influential paper, published in the journal NPJ Aging, investigates a hypothetical scenario: if we could cure all reversible causes of aging while excluding DNA changes, how long could we live?
These genetic alterations, known as somatic mutations, are not inherited but arise naturally as cells divide or become damaged over a lifetime, starting from conception. Each cell division can introduce small errors, akin to the imperfections in repeated photocopies.
Most mutations are harmless; however, the cumulative effect of these genetic discrepancies can impair cell functionality and even lead to cancer. Understanding the impact of such DNA changes remains a challenge for researchers.
Our cells possess remarkable regenerative abilities, particularly organs like the liver and lungs, which can renew cells almost indefinitely. However, organs like the heart and brain are less capable of rejuvenation, making them more susceptible to damage from somatic mutations.
The study reveals that the accumulating damage to these vital organs over decades would ultimately limit human lifespans. Eventually, the heart or brain may fail due to the overwhelming cellular damage.
While this research sheds light on the aging process, much remains unknown. The researchers note that their model does not account for interactions between organs, offering a mathematical estimate of one aging aspect. However, they remain optimistic that it could lay the groundwork for significant advancements in aging research.
“Incorporating additional major factors in aging may lead to a comprehensive theory,” the study concludes. “Collaboration among multiple research teams could make this ambitious goal achievable in the near future.”
Joao Pedro de Magalhaes, a professor of molecular biogerontology at the University of Birmingham, expressed that while the mathematical modeling is intriguing, it relies on speculative assumptions. He cautioned that estimating an upper limit on lifespan based solely on somatic mutations is highly conjectural, focusing on merely one aging mechanism.
Magalhaes’s own research suggests that aging may stem more from cellular programming than from molecular damage. “Aging may be more of an information problem than wear and tear,” he stated, proposing that reprogramming cells could potentially extend human life far beyond 200 years to 20,000 years.
However, like the Russian team, he acknowledges the need for further investigation: “The key is to thoroughly explore why we age.”
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Source: www.sciencefocus.com
