Base excision repair (BER) is a major pathway that functions to maintain genome stability. During the past few years many human germline and tumor genomes have been sequenced, resulting in the identification of mutations in a number of genes including those that function in BER. However, little is known about these mutations because many of them are rare, precluding population-based genetic studies. The rationale is that functional characterization of these germline and somatic variants will provide important insights into their functions with specific regard to human cancer. The broad, long-term objectives of the proposed research are to determine if there is a link between the presence of variants in the BER genes and human cancer. The other objective is to determine if and how mutations in these genes impact cancer therapy.
The specific aims are 1) To test the hypothesis that human germline and somatic variants of the NEIL1, 2, 3, NTHL1 and OGG1 DNA glycosylases exhibit functional phenotypes related to the etiology of human cancer; 2) To test the hypothesis that germline and somatic variants of the human DNA glycosylases NEIL1, 2, 3, NTHL1, and OGG1 have the potential to impact cancer treatment. Core A, in collaboration with the other projects, will identify variants for functional characterization. Project 1 will characterize variants that exhibit functional and/or structural defects identified in Projects 2, 3, and 4. A combined genetics and cell biology approach will be used to characterize these variants and assess their ability to induce genomic instability, cellular transformation, and to impact responses to chemotherapies. Project 1 will also participate in the characterization of the biological phenotypes of mutants produced in Project 4.

Public Health Relevance

The relevance of these studies is that they have the potential to elucidate molecular mechanisms associated with the development of cancer and with its therapy. The results are likely to be informative in clinical decision- making processes.

National Institute of Health (NIH)
National Cancer Institute (NCI)
Research Program Projects (P01)
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Special Emphasis Panel (ZCA1-RPRB-F (O1))
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University of Vermont & St Agric College
Domestic Higher Education
United States
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Lee, Andrea J; Wallace, Susan S (2016) Visualizing the Search for Radiation-damaged DNA Bases in Real Time. Radiat Phys Chem Oxf Engl 1993 128:126-133
Prakash, Aishwarya; Cao, Vy Bao; Doublié, Sylvie (2016) Phosphorylation Sites Identified in the NEIL1 DNA Glycosylase Are Potential Targets for the JNK1 Kinase. PLoS One 11:e0157860
Cannan, Wendy J; Pederson, David S (2016) Mechanisms and Consequences of Double-Strand DNA Break Formation in Chromatin. J Cell Physiol 231:3-14
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Chen, Jianhong; Morrical, Milagros D; Donigan, Katherine A et al. (2015) Tumor-associated mutations in a conserved structural motif alter physical and biochemical properties of human RAD51 recombinase. Nucleic Acids Res 43:1098-111
Morrical, Scott W (2015) DNA-pairing and annealing processes in homologous recombination and homology-directed repair. Cold Spring Harb Perspect Biol 7:a016444
Prakash, Aishwarya; Doublié, Sylvie (2015) Base Excision Repair in the Mitochondria. J Cell Biochem 116:1490-9
Prakash, Aishwarya; Carroll, Brittany L; Sweasy, Joann B et al. (2014) Genome and cancer single nucleotide polymorphisms of the human NEIL1 DNA glycosylase: activity, structure, and the effect of editing. DNA Repair (Amst) 14:17-26

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