Analysis of Mutations and Dysregulated Pathways Unravels Carcinogenic Effect and Clinical Actionability of Mutational...

Area of Science:

• Genomics
• Cancer Biology
• Molecular Oncology

Background:

• Somatic mutations are a hallmark of cancer, accumulating due to various mutational processes.
• The precise role of these processes in driving carcinogenesis is not fully understood.

Purpose of the Study:

• To investigate the causal relationships between mutational processes and somatic mutations across diverse cancer types.
• To identify specific mutational signatures and their impact on cancer genes and pathways.

Main Methods:

• Analysis of somatic mutation data from 5,828 cancer samples across 34 subtypes.
• Inference of causal links between mutational processes and observed mutation patterns.

Main Results:

• Most mutational processes generate recurrent mutations in cancer genes.
• Ultraviolet radiation and error-prone polymerases create numerous non-driver mutations.
• Specific mutations, like IDH1 p.R132H, are linked to distinct mutational processes (e.g., 5-methylcytosine deamination).
• Clock-like processes dysregulate cancer signaling pathways.
• APOBEC activity disrupts DNA repair pathways, correlating with improved survival in bladder cancer patients treated with platinum.

Conclusions:

• Mutational processes significantly influence cancer genome evolution and carcinogenesis.
• APOBEC mutagenesis and homologous recombination deficiency (HRD) synergistically enhance the efficacy of platinum-based therapies.
• Findings provide insights for targeted cancer prevention and treatment strategies.