The comprehensive study, published in the scientific journal Science Advances, pinpointed 287 unique gene variants that appear to actively reduce the standard biological effects of aging. Jonathan, an Aldabra giant tortoise, is believed to have hatched around 1832—making him a literal contemporary of historical figures such as Charles Darwin and Charles Dickens. Born five years before Queen Victoria ascended to the British throne, Jonathan has spent the vast majority of his remarkably long life residing on the island of St. Helena, a remote British Overseas Territory located in the South Atlantic Ocean.
Most of his days on the island have been spent on the grounds of the governor’s mansion, where he arrived already fully grown as a gift from the Seychelles. Giant tortoises native to the Galapagos and Seychelles islands hold a unique ecological significance, serving as the last surviving remnants of megafauna that once heavily dominated the landscapes and ecology of many isolated island ecosystems across the globe.
To better understand how Jonathan has managed to survive for nearly two hundred years, researchers looked closely at his genetic makeup. They explained that the 287 identified gene variants play a critical role in controlling fundamental biological processes within the body. These specific processes include the repair of damaged DNA, the reduction of chronic inflammation, the regulation of insulin, and the active suppression of cancer.
Furthermore, the research team compared Jonathan’s epigenome with the epigenomes of younger giant tortoises belonging to the same species. Their analysis yielded a surprising discovery: the molecular switches responsible for controlling Jonathan’s DNA repair and metabolism genes remained remarkably similar to those found in his much younger relatives.
Unlike the static genome, the epigenome incorporates chemical modifications and changes in gene expression that occur in response to various environmental and life stressors over time, making it a primary driver of the biological aging process. This investigation marks a significant milestone in longevity research, representing the very first time scientists have successfully investigated the epigenome of a giant tortoise.
The research initiative was spearheaded by scientists at Kallel, a longevity research non-profit organization. According to the team behind the project, successfully cracking the genetic code behind a multi-century life provides unprecedented insights into the limits of extreme lifespan.
Dr. Justin Gerlach, a scientist from Cambridge University who participated in the research, noted the exceptional stability observed in the tortoise’s biological systems. For several decades, Dr. Gerlach has dedicated his career to studying the ecology and conservation of giant tortoises, though this study represents his first formal investigation into the molecular foundations of their extraordinary longevity.
Commenting on the findings, Dr. Gerlach explained that the gene regulators responsible for energy production and DNA repair have remained remarkably stable in Jonathan across nearly two centuries. He emphasized that very few creatures on Earth are capable of providing as much valuable information about the biological mechanisms of aging as the giant tortoises native to the Galapagos and Seychelles islands.
Dr. Stephen Clark, the founder of Kallel and the senior author of the study, shared a similar perspective on the broader implications of the research for human health and medicine. He pointed out that nature has already solved the puzzle of aging in remarkable ways, and suggested that Jonathan’s genome serves as a biological blueprint for cellular resilience.
The ultimate objective of the research team is to take these evolutionary insights and translate them into practical, accessible medical treatments for everyday people. Dr. Clark noted that aging remains the single greatest risk factor for nearly every major chronic disease faced by modern society, and expressed hope that philanthropic support can help democratize future advancements in longevity medicine.
