Genomic landscape of DNA repair genes in cancer

Area of Science:

• Genomics
• Cancer Biology
• Molecular Oncology

Background:

• DNA repair gene mutations are common in cancer, but their collective genomic landscape and functional impact remain understudied.
• Understanding these alterations is crucial for identifying cancer drivers and developing targeted therapies.

Purpose of the Study:

• To comprehensively analyze the genomic landscape (mutations, CNVs, expression) of DNA repair genes and indirect caretakers in cancer.
• To identify candidate genes for cancer biomarkers, therapeutic targets, and immunotherapy predictors.

Main Methods:

• Compiled comprehensive gene lists and analyzed mutation, copy number variation (CNV), and expression frequencies using COSMIC and TCGA databases.
• Investigated gene co-occurrence, clinical outcomes, and mutation burden across various cancer types.

Main Results:

• Identified the top 20 most frequent DNA repair genes with mutations, CNVs, or altered expression.
• Observed mutual exclusivity in CNV and expression patterns, with positive correlations between CNV gain/loss and up/down-regulation.
• Found that DNA repair gene mutations often correlate with increased tumor mutation burden, suggesting roles in genomic instability.

Conclusions:

• Genomic alterations in DNA repair genes provide insights into their tumor suppressive or oncogenic functions.
• The observed patterns of mutual exclusivity and correlation support the functional significance of these genomic changes.
• This research offers valuable lists of candidate genes for potential use as biomarkers and therapeutic targets in oncology.