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DNA-lesion mapping in mammalian cells
Ahmad Besaratinia1, Gerd P Pfeifer
1Division of Biology, Beckman Research Institute of the City of Hope National Medical Center, Duarte, CA 91010, USA. ania@coh.org
Abstract:
Formation of DNA damage is a crucial event in carcinogenesis. Irreparable DNA lesions have the potential to cause mispairing during DNA replication, thereby giving rise to mutations. Critically important mutations in cancer-related genes, i.e., oncogenes and tumor suppressor genes, are key contributors to carcinogenesis. Theoretically, co-localization(s) of persistent DNA lesions and mutational hotspots in cancer-relevant genes can be used for causality inference. The inferred causality can be validated if a suspected carcinogen can similarly produce corresponding patterns of DNA damage and mutagenesis in vitro and/or in vivo. DNA-lesion footprinting (mapping) in conjunction with mutagenicity analysis is used for investigating cancer etiology. Ligation-mediated polymerase chain reaction (LM-PCR) is a versatile DNA-lesion footprinting technique, which enables sensitive and specific detection of DNA damage, at the level of nucleotide resolution, in genomic DNA. Here, we describe an updated protocol for LM-PCR analysis of the mammalian genome. This protocol can routinely be used for DNA-lesion footprinting of a variety of chemical and/or physical carcinogens in mammalian cells.
Insights
This study details an updated protocol for DNA-lesion footprinting using ligation-mediated polymerase chain reaction (LM-PCR). This method helps identify carcinogen-induced DNA damage patterns and mutations, aiding cancer etiology research.
Area of Science:
- Molecular Biology
- Cancer Research
- Genotoxicology
Background:
- DNA damage is a critical step in cancer development.
- Mutations in oncogenes and tumor suppressor genes drive carcinogenesis.
- Linking DNA damage sites to mutation hotspots can infer causality.
Purpose of the Study:
- To present an updated protocol for DNA-lesion footprinting.
- To enable sensitive and specific detection of DNA damage at nucleotide resolution.
- To investigate cancer etiology by mapping DNA damage and mutagenesis.
Main Methods:
- DNA-lesion footprinting (mapping) combined with mutagenicity analysis.
- Ligation-mediated polymerase chain reaction (LM-PCR) for sensitive DNA damage detection.
- Application of LM-PCR to the mammalian genome for carcinogen analysis.
Main Results:
- The updated LM-PCR protocol provides nucleotide-level resolution of DNA damage.
- The method allows for routine DNA-lesion footprinting of various carcinogens.
- This technique facilitates the study of DNA damage and mutagenesis patterns.
Conclusions:
- The described LM-PCR protocol is a versatile tool for DNA-lesion footprinting in mammalian cells.
- This method aids in understanding the etiological mechanisms of chemical and physical carcinogens.
- It supports the inference and validation of carcinogen-induced causality in cancer development.
