Researchers Sequenced Genome of 194-Year-Old Tortoise
The study of Jonathan the giant tortoise identifies genetic parallels to human aging and long-lived species.
Updated on Oct. 7, 2026 in Life Sciences
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Scientists have published the full genome sequence of Jonathan, a 194-year-old Aldabra giant tortoise living on St. Helena. The research, published in Science Advances, compares the tortoise to younger counterparts to isolate longevity factors.
Why it matters
By identifying how this 400-pound reptile avoids age-related decay, researchers hope to uncover the fundamental genetic architecture behind longevity. The study bridges the gap between animal models and human aging processes.
The study compared Jonathan’s genome against tortoises 100 years younger, finding preserved control switches linked to mitochondria—the energy-producing components of cells. It also identified gene overlaps with naked mole rats, which can live up to 40 years, and observed epigenetic changes similar to humans.
The players
UCLA
A major research university with a broad focus on biological sciences and genomic mapping.
University of Cologne
A research institution focused on evolutionary biology and genetic longevity studies.
University of Alabama at Birmingham
An academic institution with extensive research programs in gerontology and molecular biology.
The details
Researchers collected DNA via a saliva swab from the tortoise's cheek, which was then transported by boat for analysis. The study focused on how genes regulate biological decay, noting that Jonathan maintains mitochondrial integrity even at his extreme age. These findings suggest that certain regulatory mechanisms protecting energy production are more stable in these tortoises than in shorter-lived species.
Timeline
1832: Estimated birth year of Jonathan.
June 2026: Jonathan was officially added to the Guinness World Records list.
October 7, 2026: Results of the genome sequencing study were announced.
The Tech Race
This project contributes to the broader effort to map the genetic determinants of exceptional longevity across the animal kingdom. It builds on comparative genomics studies that seek to contrast the biology of long-lived organisms with shorter-lived models like the naked mole rat.
This research is currently in the fundamental discovery phase and does not have immediate clinical applications for human longevity. It provides the essential genetic data that future medical research will use to investigate age-related cellular preservation.
The takeaway
Jonathan's genome provides a critical data point for understanding the limits of biological decay. Watch for future studies as researchers expand this genomic dataset to include more Aldabra tortoises to confirm which gene switches drive his 194-year lifespan.
What happens next
The research team plans to conduct follow-up genomic analyses on additional Aldabra tortoises and other long-lived species to validate these findings.
Further reading
For more research on how genetic sequencing is transforming our understanding of biology, visit Life Sciences.
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