Ionizing Radiation and Ultraviolet Light Irradiation-Associated DNA Damage Increasing Genomic Instability Risk

Area of Science:

• Genetics
• Molecular Biology
• Cancer Research

Background:

• Genomic instability, characterized by structural variants (SVs) and single nucleotide variants (SNVs), is a hallmark of cancer.
• While DNA repair deficiencies (e.g., BRCA1/2 mutations) are linked to cancer, many tumors exhibit instability without known defects in canonical repair pathways.
• Exogenous factors like ionizing radiation (IR) and ultraviolet (UV) light are known inducers of DNA damage and mutagenesis.

Purpose of the Study:

• To review current knowledge on how IR and UV irradiation induce DNA damage.
• To elucidate the specific DNA lesions generated by IR and UV that contribute to genomic instability.
• To explain the mechanisms by which these lesions promote mutagenesis in cancer-driver genes.

Main Methods:

• This review synthesizes existing research findings from experimental studies and literature.
• It focuses on the types of DNA damage induced by IR and UV light.
• The review examines the link between DNA damage, repair pathways, and subsequent mutagenesis.

Main Results:

• IR and UV light induce diverse DNA lesions, including DNA double-strand breaks (DSBs), which can lead to SVs if repaired erroneously.
• Specific types of DNA damage generated by IR and UV contribute significantly to genomic instability.
• These lesions can directly or indirectly cause mutations within critical cancer-driver genes.

Conclusions:

• IR and UV irradiation are significant contributors to cancer-associated genomic instability and mutagenesis.
• Understanding the specific DNA damage types and their mutagenic consequences is essential for comprehending cancer development.
• Further research into these mechanisms may reveal novel therapeutic targets for radiation-induced or DNA repair-deficient cancers.