Science Identifies Basis for Greenland Shark Longevity
New findings reveal the genetic and ocular mechanisms that enable the species to live for over 400 years.
Updated on Oct. 26, 2026 in Life Sciences
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Research published in 2026 confirms that Greenland sharks possess specific genetic repair mechanisms and ocular adaptations that facilitate lifespans exceeding 400 years. This biological analysis builds on a 2024 genome mapping project to explain the longevity of the world's longest-living vertebrate.
Why it matters
Understanding how Greenland sharks avoid cellular degradation and maintain ocular health in extreme environments offers new insights into vertebrate aging. This research highlights the unique physiological adaptations that allow a species to thrive in near-freezing deep-sea conditions.
Researchers identified specialized DNA repair markers and eye cells adapted for high-pressure darkness. These findings corroborate a 2016 study that used radiocarbon dating of eye lens proteins to estimate ages, including one individual at 392 years.
The players
Greenland Shark
A long-lived vertebrate species inhabiting the Arctic and North Atlantic, reaching up to 7 meters in length.
The details
Greenland sharks grow less than one centimeter annually, a pace tied to their extremely slow metabolism in near-freezing Arctic waters. By mapping the full genome, scientists identified specific genetic sequences responsible for repairing DNA damage and maintaining vision at depths up to 2,000 meters. These adaptations allow the sharks to reach sexual maturity at approximately 150 years of age.
Timeline
1626: Date assigned to the birth of a Greenland shark.
2016: Scientists completed radiocarbon dating of eye proteins for 28 sharks.
2024: An international team successfully mapped the complete Greenland shark genome.
2025: The Canadian government published reports regarding population uncertainty.
2026: Researchers published findings detailing the biological basis for the species' eyesight.
The Tech Race
This research follows the 2024 landmark effort to sequence the Greenland shark genome. It advances the field from basic identification of the species' long life to understanding the specific repair mechanisms that enable it.
The findings primarily inform conservation efforts, as these sharks face accidental bycatch risks in commercial fisheries. Understanding their slow maturation rate is critical for managing population stability in North Atlantic and Arctic waters.
The takeaway
This research confirms the biological capacity of Greenland sharks to live beyond 400 years through specialized DNA repair. Watch for future governmental reports on population status following the 2025 Canadian study to see if these findings influence protection policies.
Further reading
Explore deeper findings in Life Sciences.
Source note: This article includes information reported by The Times of India.
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