Chernobyl Dogs Show Unique Genetic Traits 40 Years After Disaster

The news in Polish

1. potomek  (m.)
   osoba lub zwierzę pochodzące od kogoś, następne pokolenie ↩︎
2. katastrofa  (f.)
   bardzo poważne i nagłe zdarzenie powodujące wielkie zniszczenia lub ofiary ↩︎
3. odkryć
   znaleźć lub dowiedzieć się czegoś, co wcześniej nie było znane ↩︎
4. reaktor  (m.)
   urządzenie, w którym zachodzi kontrolowana reakcja jądrowa produkująca energię ↩︎
5. środowisko  (n.)
   otoczenie, w którym żyje organizm, warunki naturalne wokół nas ↩︎
6. promieniowanie  (n.)
   emisja energii w postaci fal lub cząstek, szczególnie szkodliwa dla żywych organizmów ↩︎

Translation

Text comprehension

Question 1: Where do the dogs living near Chernobyl come from?

Question 2: What did scientists discover when they studied the dogs’ genes?

Vocabulary

Polish	English
potomek  (m.)	descendant
katastrofa  (f.)	disaster
odkryć	to discover
reaktor  (m.)	reactor
środowisko  (n.)	environment
promieniowanie  (n.)	radiation

Read the full story

Forty years after the Chernobyl nuclear disaster, several hundred dogs live within the Exclusion Zone surrounding the ruined power plant. Most are descendants of pets left behind by residents who fled. Isolated from the outside world, they have become a remarkable subject of scientific research.

An international team of scientists found that dogs living closest to the destroyed reactor are genetically distinct from those inhabiting more distant parts of the zone. Early suspicions pointed to radiation-induced mutations as the cause, but further analyses did not support that conclusion.

In the most recent study, published in the journal Genes, researchers sequenced the full genomes of more than one hundred dogs from various parts of the Exclusion Zone. They examined two main hypotheses: whether the observed genetic differences resulted from natural selection or from random genetic drift within an isolated population.

The findings were striking. The genetic differences found in dogs near the reactor are not random — they are concentrated in specific parts of the genome linked to genes associated with disease resistance, cell function, and cancer risk.

While scientists cannot yet confirm conclusively that the changes are the result of natural selection, the evidence suggests these dogs may have developed unique traits that help them survive in an environment full of toxins and radiation. It is possible that the earliest generations after the disaster already carried genetic predispositions that improved their chances of survival, and that these traits became more widespread across the population over time.

Researchers note that entirely new mutations did not appear to arise; rather, existing genetic diversity may have determined which individuals survived and passed on their genes. The scientists say their findings open new avenues for understanding how environmental contamination affects living organisms, and that future research could help protect both animals and humans from the consequences of nuclear disasters.