--- title: "Jonathan the Tortoise Defies Expectations of Longevity" url: https://newscentral.site/jonathan-the-tortoise-defies-expectations-of-longevity/ language: en publisher: "News Central Site" section: "Science" published: 2026-10-07T19:05:40.000Z updated: 2026-10-08T05:57:06.896Z id: 599ac270-4dc4-418b-9a0d-4309fdfd7174 source: "Live Science https://www.livescience.com/animals/turtles-tortoises/scientists-discover-the-genetic-secrets-that-may-have-helped-jonathan-the-tortoise-live-to-194-years-old" attribution: "Link to https://newscentral.site/jonathan-the-tortoise-defies-expectations-of-longevity/ and name News Central Site when you quote or summarize this story." --- # Jonathan the Tortoise Defies Expectations of Longevity A new study has shed light on the genetic secrets behind Jonathan's remarkable aging process, revealing that his genes associated with mitochondrial function are remarkably resilient. On the remote south Atlantic island of St. Helena, an extraordinary creature has been living for nearly two centuries, defying expectations of longevity. Jonathan, the oldest known land animal, is a tortoise that has outlived its expected lifespan by about a century. As an Aldabra giant tortoise, Jonathan's advanced age has piqued the interest of scientists who are eager to uncover the secrets behind his remarkable endurance. Researchers have been studying Jonathan's genetic makeup and epigenetic traits in search of answers. Epigenetic markers, which sit on top of DNA molecules, play a crucial role in controlling gene expression. By analyzing these markers, scientists may be able to identify key factors that contribute to longevity. A new study has shed light on the genetic secrets behind Jonathan's remarkable aging process. The research found that his genes associated with mitochondrial function are remarkably resilient. Mitochondrial dysfunction has been linked to various diseases and a decline in longevity, but Jonathan's healthy mitochondria suggest a different story. The findings of this study have significant implications for our understanding of aging and longevity. According to Stephen Clark, chief scientist at the Kallel Foundation, Jonathan's unique genetic profile offers fresh insights into the relationship between mitochondrial function and longevity. Jonathan's remarkable age has sparked curiosity among scientists who are eager to learn more about his genetic makeup. The study's findings were published in the journal Science Advances, but further research is needed to fully understand the secrets behind this extraordinary tortoise's incredible longevity. The process of collecting DNA samples from Jonathan the tortoise proved to be a challenging task for researchers. Due to concerns about infection, island authorities forbade drawing blood from the tortoise, leaving veterinarians with limited options. To gather the necessary data, Joe Hollins, the veterinarian responsible for Jonathan's care, had to rely on alternative methods. In an interview, researcher Clark revealed that he was initially hesitant to proceed with collecting samples due to the risks involved. He stated, "I didn't want to be the doctor that killed Jonathan." This concern led Hollins to use a cheek swab instead of blood sampling to collect DNA from the tortoise. However, when the DNA samples arrived in the US for analysis, researchers encountered an unexpected issue. Their computers kept crashing due to a peculiar problem - the DNA had been isolated from bacteria in Jonathan's mouth rather than his own cells. This mistake required researchers to start over and re-collect samples. To rectify the situation, Clark had to seek additional permission to collect more data. Hollins then sent cheek scrape samples using a different tool, which successfully yielded DNA from Jonathan. The collected DNA was fragmented due to its source, so researchers used an existing reference genome of a 36-year-old Aldabra tortoise named Tank to fill in the gaps. The comparison between Jonathan's DNA and that of another Galapagos tortoise, Lonesome George, also provided valuable insights for researchers. Lonesome George had been estimated to be over 100 years old at the time of his death in 2012, making him a relevant reference point for understanding the genetic characteristics of aging tortoises. The genetic analysis revealed that Jonathan possessed a distinct set of gene variants not found in Tank and Lonesome George. These 287 unique variants are associated with pathways involved in DNA repair and telomere function, which tend to deteriorate with age. This finding is significant because it highlights the similarities between aging processes across species. As one expert pointed out, these genetic pathways are also relevant to human aging, indicating a common "broader signature of aging" that transcends species boundaries. The researchers also examined epigenetic changes in Jonathan's DNA, focusing on patterns of DNA methylation. This process involves the attachment of methyl groups to specific regions of the genome, which can influence gene expression over time. Certain patterns of methylation can serve as a biological "clock, reflecting an organism's age. In comparing Jonathan's DNA methylation patterns with those of young and old Aldabra tortoises, the researchers observed that older tortoises exhibited more disordered methylation patterns. This phenomenon is known as methylation entropy," where random changes accumulate over time. Mitochondria play a crucial role in maintaining cellular health by generating energy and repairing DNA damage. Researchers believe that preserving the integrity of these mitochondrial genes may be essential for longevity. While the study suggests a link between low entropy in mitochondrial genes and long lifespan, the authors acknowledge that they cannot establish a causal relationship. They emphasize the need for further experimentation to confirm their findings. The team's inability to collect a comprehensive genetic profile from Jonathan during his lifetime is another limitation of the study. It can only be fully understood after his passing, when researchers can analyze DNA samples from multiple tissues. Experts agree that certain organs are more susceptible to age-related diseases due to accumulated mutations over time. Understanding these specific mutations could provide valuable insights into the aging process and potentially lead to new longevity treatments. More research is needed to determine whether the identified mitochondrial genes contribute to long lifespan in Aldabra tortoises, or if Jonathan's case is an exception rather than a rule. The discovery of the genetic secrets behind Jonathan's remarkable longevity has sparked debate among researchers. Some have suggested that Jonathan's case may not be representative of his species as a whole, but rather an exceptional instance of aging well. Further analysis is needed to determine whether the identified mitochondrial genes are indeed responsible for the long lifespan observed in Aldabra tortoises or if they merely coincided with it. The study's findings also highlight the complexity of aging and the need for continued research into the underlying mechanisms that govern this process. Ultimately, the secrets of Jonathan's remarkable longevity remain a mystery waiting to be unraveled by further scientific inquiry. --- Source: [Live Science](https://www.livescience.com/animals/turtles-tortoises/scientists-discover-the-genetic-secrets-that-may-have-helped-jonathan-the-tortoise-live-to-194-years-old) Published by News Central Site: https://newscentral.site/jonathan-the-tortoise-defies-expectations-of-longevity/