Jonathan the Tortoise’s DNA Offers Clues to Exceptional Longevity
Jonathan, an Aldabra giant tortoise estimated to be 194 years old, has gene-regulatory patterns for DNA repair and metabolism that resemble those of much younger tortoises. A study in Science Advances, led by the nonprofit Kallel, identified 287 unique gene variants in Jonathan that may lessen aging effects. It is the first analysis of a giant tortoise epigenome and suggests possible avenues for aging research in humans.
Jonathan, an Aldabra giant tortoise, is thought to be 194 years old and has inhabited St. Helena for 144 years. He reached the island in 1882 from the Seychelles as a fully grown gift to its governor and now lives near Plantation House.
Researchers led by the nonprofit Kallel compared his DNA and epigenetic regulation with younger Aldabra tortoises. Their Science Advances paper, dated October 7, 2026, is described as the first giant tortoise epigenome study. It found 287 variants tied to DNA repair, inflammation, insulin control, and cancer suppression, plus stable regulation of energy and repair genes.
This research may interest aging biologists, conservationists, and patients hoping for treatments. It could shape how scientists study longevity by highlighting DNA repair, metabolism, inflammation, insulin, and cancer defenses. For St. Helena, Jonathan's fame may draw attention to tortoise conservation. Human applications remain speculative; findings might inform future treatment or gene-regulation research, but they do not yet offer proven interventions.