Welfare of Animals in Genetic Research Involving Gene Editing

CRISPR and other gene editing technologies are increasingly used to create animal models for disease research, with welfare implications for edited animals and their offspring.

Key Facts

Gene editing has created thousands of novel animal models for human disease research since CRISPR became available in 2012
Off-target editing effects can cause unexpected phenotypes that cause pain or distress without prior assessment
Edited animals often develop conditions specifically intended to model human disease — a deliberate welfare cost
Germline editing passes welfare-relevant phenotypes to all offspring of edited animals indefinitely
3Rs principles require that gene editing not be used where existing models or non-animal alternatives suffice

Welfare Considerations

Gene editing technologies have dramatically accelerated the creation of animal disease models, and with them, the welfare burden on individual animals. Animals edited to develop painful conditions, to lack immune function, or to carry progressive neurological diseases experience real suffering in service of research goals. The power and precision of gene editing makes this welfare cost easier to justify for genuinely important questions — but also easier to underestimate for incremental ones. Rigorous ethical review that weighs welfare costs against research value is essential.

What You Can Do

Support funding for non-animal alternatives to gene-edited animal models where scientifically feasible
Advocate for mandatory welfare impact assessment for all gene editing animal research proposals
Donate to organizations developing computational and organoid alternatives to gene-edited animal models
Raise awareness of gene editing welfare implications in public discussions of biotechnology