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Genetic background sets the trajectory of experimental cancer evolution
Sarah J Aitken1,2,3,4,5, Frances Connor6, Christine Feig6
1Center of Molecular and Cellular Oncology, Yale Cancer Center, New Haven, CT, USA. sarah.aitken@yale.edu.
Nature
|July 22, 2026
Summary
Genetic background significantly influences cancer development and progression. Even small genetic differences, similar to human ancestry variations, alter tumor evolution and risk by affecting gene interactions and mutation selection.
Area of Science:
- Genomics
- Cancer Biology
- Evolutionary Medicine
Background:
- Human cancers exhibit significant heterogeneity.
- Studying germline genetics and environment's role in tumor evolution is challenging due to diverse human populations.
- Existing models struggle to isolate genetic from environmental influences on cancer progression.
Purpose of the Study:
- To dissect the impact of germline genetic variation on tumor evolution under controlled conditions.
- To model early tumor evolution across diverse genetic backgrounds.
- To understand how genetic interactions shape cancer progression and risk.
Main Methods:
- Utilized diverged inbred mouse strains to simulate early tumor evolution hundreds of times.
- Controlled for sex, environment, and carcinogenic exposures.
- Generated matched histology, whole-genome, and transcriptome sequences for detailed analysis.
Main Results:
- Identified epistatic interactions between genetic background and somatic mutations driving population-specific disease progression.
- Observed strain-specific selection of driver mutations and occurrence of whole-genome duplication.
- Demonstrated that genetic divergence alters selection pressures, impacting cancer susceptibility and tumor growth rate.
Conclusions:
- Germline genetic background plays a critical role in shaping tumor evolution and cancer risk.
- Even modest genetic variations, comparable to human ancestry differences, profoundly influence cancer development.
- This study provides a framework for understanding genetic influences on cancer trajectories.
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