Image Courtesy: Shutterstock
Wolves living in the Chernobyl Exclusion Zone appear to have developed genetic differences that may help them withstand the cancer risks associated with decades of radiation exposure. Researchers studying the animals have identified changes in their immune systems and parts of their genome that appear more resilient to cancer.
The findings come from research led by Cara Love, an evolutionary biologist and ecotoxicologist at Princeton University, who has studied Chernobyl’s wolves for about a decade. The animals live in an environment where radiation remains a persistent threat, yet wildlife populations have flourished since humans abandoned the area following the 1986 nuclear disaster. The research was presented at the Society for Integrative and Comparative Biology’s annual meeting in Seattle in January 2024.
Love and her colleagues traveled to the exclusion zone in 2014 to collect blood samples and monitor the wolves’ exposure to radiation. Some animals were fitted with collars equipped with tracking and radiation-measuring equipment, allowing researchers to determine where the wolves traveled and how much radiation they encountered.
The researchers estimated that the wolves receive more than 11.28 millirem of radiation every day throughout their lives, more than six times the legal safety limit for human workers. Despite this prolonged exposure, the animals have survived and reproduced in the contaminated region.
Blood analysis revealed altered immune systems that resemble those observed in cancer patients receiving radiation treatment. More significantly, genetic analysis identified specific regions of the wolves’ genomes that appear to be associated with resilience to increased cancer risk.
The researchers are particularly interested in these potentially protective mutations. Much of human cancer genetics focuses on mutations that increase susceptibility to disease, but identifying genetic changes that help organisms withstand cancer could eventually provide new avenues for medical research.
Chernobyl’s wolves are not the only animals showing genetic differences after generations in the exclusion zone. Researchers have also identified distinct genetic characteristics among the semi-feral dogs living in the area.
However, the findings do not mean the wolves are immune to cancer or that radiation has made them universally healthier. The researchers still need more evidence to determine exactly how the genetic changes affect cancer development and survival.
Further fieldwork has been disrupted by the COVID-19 pandemic and Russia’s ongoing war in Ukraine, making additional sampling difficult. Love has said the safety of researchers and collaborators remains the priority.
If scientists can identify the mechanisms behind the wolves’ apparent cancer resilience, the research could eventually help reveal protective genetic pathways relevant to humans.
