How do laboratory mice help scientists study human diseases?

Laboratory mice are essential in medical research primarily because their genetic makeup closely resembles that of humans, allowing them to serve as effective models for studying human diseases. Because humans and mice share many genes, researchers can investigate the biological roles of specific genes and how their dysfunction contributes to various conditions, including cancer, diabetes, and Parkinson disease.21

Scientists utilize several key methods to leverage these similarities:

• Genetic Engineering: Through techniques like homologous recombination, researchers create knockout mice by inactivating specific genes to observe the resulting effects on health and development.21
• Disease Modeling: Mice can be modified to carry the same genetic mutations found in human hereditary diseases, enabling the study of disease pathology and the testing of new drug therapies.31
• Efficiency: Their short life cycles allow scientists to observe the progression of diseases and the impact of treatments over an entire lifespan or across multiple generations, which is not feasible with human subjects.24

While these models are vital for scientific progress, the use of animals in research is a significant ethical issue, and researchers are guided by the "three Rs" principle—replacement, reduction, and refinement—to minimize animal suffering.4