The Chornobyl Dogs: Why Scientific Evaluation Must Accompany Population Management.
7 affiliations
- 1Department of Digestive Surgery, Rouen University Hospital, F-76000 Rouen, France.
- 2Espace Régional de Réflexion Éthique, CHU Rouen, F-76000 Rouen, France.
- 3Univ Rouen Normandie, Normandie Univ, Inserm U1245 and Department of Genomic and Personalized Medicine in Cancer and Neurological Disorders, CHU Rouen, F-76000 Rouen, France.
- 4Centre Hospitalier du Rouvray, Service Hospitalo-Universitaire de Psychiatrie, Centre d'Excellence Thérapeutique, F-76300 Sotteville-lès-Rouen, France.
- 5Univ Rouen Normandie, Normandie Univ, Inserm U1245 and Department of Genetics and Reference Center for Developmental Disorders, CHU Rouen, F-76000 Rouen, France.
- 6Department of Biological Sciences, University of South Carolina, Columbia, SC 29208, USA.
- 7Clean Futures Fund, Godfrey, IL 62035, USA.
Abstract
Nearly four decades after the 1986 reactor explosion, several hundred semi-feral dogs persist within the Chornobyl Exclusion Zone. Genomic work has characterised their population structure and shown that radiation-induced mutation does not, on current evidence, drive the differentiation between groups; the cause of that differentiation remains unresolved, and their epigenome has never been examined. These dogs are a potentially valuable model for chronic, low-dose, multi-stressor exposure, not because they are "radiation-adapted", a contested claim, but because they are a human-adjacent, densely sampled, pedigreed mammal for which comparative canine-human tools already exist. Since 2017, a humane sterilisation programme, carried out at the request of and in cooperation with the Ukrainian authorities, has reached near-complete coverage of the established populations. That programme was justified: dogs are formally prohibited in the zone, they injure workers, free-roaming animals inside an operating nuclear facility raise security as well as veterinary concerns, and reproduction was outpacing what the environment could support. Our argument concerns timing rather than policy. The scientific value of this population was never evaluated while it was still breeding, and the archived material that does exist, roughly 400 dogs including parent-offspring trios and repeat-sampled individuals, was assembled for population genetics rather than for the regulatory questions now worth asking. That archive should be analysed for methylation and expression now, as this is the only access to the population as it was. The animals themselves have not gone: several hundred identified dogs are still alive there, so sampling at veterinary contact and the retention of tissue at natural death or clinically indicated euthanasia remain possible, provided they are planned and funded in advance rather than improvised. More generally, the scientific evaluation of a population should accompany the decision to manage it rather than follow it, because sterilisation is not reversible at the population scale and an archive cannot be assembled retrospectively. We set out what such an evaluation requires at the outset of a programme. Its most concrete element asks nothing of the animals: a sterilisation clinic is the only routine access to a free-roaming population under anaesthesia, and the reproductive tissue it removes-the one material capable of addressing germline questions-is discarded as surgical waste.
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BibTeX
@article{tuech2026chornobyl,
title = {{The Chornobyl Dogs: Why Scientific Evaluation Must Accompany Population Management.}},
author = {Jean-Jacques Tuech and Olivier Guillin and Jean Pinson and Gaël Nicolas and Timothy A Mousseau and Jennifer A Betz},
journal = {Animals : an open access journal from MDPI},
year = {2026},
month = sep,
doi = {10.3390/ani16192973},
url = {https://europepmc.org/article/MED/42882942},
note = {CC BY},
}
RIS
TY - JOUR
TI - The Chornobyl Dogs: Why Scientific Evaluation Must Accompany Population Management.
AU - Jean-Jacques Tuech
AU - Olivier Guillin
AU - Jean Pinson
AU - Gaël Nicolas
AU - Timothy A Mousseau
AU - Jennifer A Betz
PY - 2026
DA - 2026/09/22
JO - Animals : an open access journal from MDPI
DO - 10.3390/ani16192973
UR - https://europepmc.org/article/MED/42882942
AB - Nearly four decades after the 1986 reactor explosion, several hundred semi-feral dogs persist within the Chornobyl Exclusion Zone. Genomic work has characterised their population structure and shown that radiation-induced mutation does not, on current evidence, drive the differentiation between groups; the cause of that differentiation remains unresolved, and their epigenome has never been examined. These dogs are a potentially valuable model for chronic, low-dose, multi-stressor exposure, not because they are "radiation-adapted", a contested claim, but because they are a human-adjacent, densely sampled, pedigreed mammal for which comparative canine-human tools already exist. Since 2017, a humane sterilisation programme, carried out at the request of and in cooperation with the Ukrainian authorities, has reached near-complete coverage of the established populations. That programme was justified: dogs are formally prohibited in the zone, they injure workers, free-roaming animals inside an operating nuclear facility raise security as well as veterinary concerns, and reproduction was outpacing what the environment could support. Our argument concerns timing rather than policy. The scientific value of this population was never evaluated while it was still breeding, and the archived material that does exist, roughly 400 dogs including parent-offspring trios and repeat-sampled individuals, was assembled for population genetics rather than for the regulatory questions now worth asking. That archive should be analysed for methylation and expression now, as this is the only access to the population as it was. The animals themselves have not gone: several hundred identified dogs are still alive there, so sampling at veterinary contact and the retention of tissue at natural death or clinically indicated euthanasia remain possible, provided they are planned and funded in advance rather than improvised. More generally, the scientific evaluation of a population should accompany the decision to manage it rather than follow it, because sterilisation is not reversible at the population scale and an archive cannot be assembled retrospectively. We set out what such an evaluation requires at the outset of a programme. Its most concrete element asks nothing of the animals: a sterilisation clinic is the only routine access to a free-roaming population under anaesthesia, and the reproductive tissue it removes-the one material capable of addressing germline questions-is discarded as surgical waste.
SN - 2076-2615
ER -