Background 

Bladder cancer is one of the most common cancers in the United States, and environmental exposures, particularly cigarette smoke and workplace chemicals called polycyclic aromatic hydrocarbons (PAHs), contribute to bladder cancer risk. However, the mechanisms through which these exposures damage DNA and contribute to cancer development remain poorly understood. APOBEC3A, an enzyme that normally helps protect against viral infections, can mistakenly damage our own DNA. Its distinctive DNA damage signature is found in most bladder cancers and in some normal-appearing bladder tissue, suggesting that cancer-related changes may begin years before a tumor develops. 

What the Study Will Address 

This study will investigate whether environmental chemical exposures activate APOBEC3A in bladder cells and trigger the DNA damage that contributes to bladder cancer. Researchers will examine whether prolonged chemical exposure activates the enzyme and produces its characteristic DNA damage, use gene-editing technology to determine whether APOBEC3A drives this damage, and validate the findings in a mouse model that closely reflects human bladder biology. 

Why It Matters 

This research could help explain how smoking and occupational chemical exposures contribute to bladder cancer development. By improving our understanding of early cancer-related DNA damage, the findings may help identify individuals at greater risk and inform future strategies to prevent or intercept cancer development, potentially reducing bladder cancer incidence, recurrence, and the need for invasive treatments.