Mice are the cornerstone of preclinical research because they combine logistical convenience with biological relevance. Their small size and low maintenance costs make them accessible to laboratories of all scales. In addition, their physiology and genetics are highly conserved with humans, enabling translational insights.
Because mice reproduce rapidly and produce large litters, researchers can acquire high numbers of genetically identical individuals at a fraction of the cost of larger species. The short lifespan of a few years allows longitudinal studies across multiple generations.
More than 90 % of mouse genes are homologous to human genes, and their organ systems mirror human anatomy and function. This genetic overlap underpins the validity of mouse models in studying disease mechanisms, drug responses, and gene–environment interactions.
One of the most powerful tools in mouse research is the creation of genetically engineered strains. “Knockout” mice are engineered to lack a specific gene, allowing scientists to observe the effects of its absence on physiology and pathology. These models have illuminated the roles of many genes in cancer, cardiovascular disease, and neurodegeneration.
Transgenic mice, in which foreign DNA is inserted into the genome, provide another robust platform for modeling human diseases. By expressing human genes or disease‑associated mutations, researchers can replicate disease phenotypes and evaluate therapeutic strategies.
While no animal model can perfectly recapitulate human biology, the convergence of practical, genetic, and physiological advantages makes mice indispensable for biomedical discovery.
