Environmental exposure and endogenous metabolism both give rise to the alkylation of DNA, and DNA alkylation represents the major mechanism of action for a number of commonly prescribed cancer chemotherapeutic agents. Thus, assessing how alkylated DNA lesions compromise the flow of genetic information by altering the efficiency and fidelity of DNA replication and transcription and how these lesions are repaired will provide important knowledge for understanding the implications of DNA alkylation in the etiology for developing human diseases. Such knowledge will also form the basis for developing better strategies for cancer chemotherapy. The emphasis of this application is placed on a group of alkylated thymidine lesions which have been shown to persist in mammalian tissues or have been detected at substantially elevated levels in lymphocyte samples of humans exposed to cigarette smoke. We will employ an innovative and multi- pronged approach, including synthetic organic chemistry, mass spectrometry-based bioanalytical chemistry, and molecular biology to achieve a molecular-level understanding about how the under-investigated group of alkylated thymidine lesions impede DNA replication and transcription in cells, and induce mutations in these processes. We will also assess the implications of nucleotide excision repair and base excision repair pathways in the repair of these lesions in cells. The outcome of the proposed research will bring our understanding of this largely overlooked group of alkylated DNA lesions to a significantly higher level.

Public Health Relevance

Humans are exposed to DNA alkylating agents via endogenous metabolism, environmental exposure, and/or cancer chemotherapy. The proposed research will reveal novel knowledge about how alkylated DNA lesions perturb the flow of genetic information by compromising the efficiency and fidelity of DNA replication and transcription and how these lesions are repaired. The outcome of the proposed research will ultimately lead to the discovery of novel risk factors for developing human diseases and novel strategies for cancer chemoprevention.

Agency
National Institute of Health (NIH)
Institute
National Institute of Environmental Health Sciences (NIEHS)
Type
Research Project (R01)
Project #
5R01ES025121-05
Application #
9591714
Study Section
Special Emphasis Panel (ZRG1)
Program Officer
Reinlib, Leslie J
Project Start
2014-11-05
Project End
2020-10-31
Budget Start
2018-11-01
Budget End
2020-10-31
Support Year
5
Fiscal Year
2019
Total Cost
Indirect Cost
Name
University of California Riverside
Department
Chemistry
Type
Earth Sciences/Resources
DUNS #
627797426
City
Riverside
State
CA
Country
United States
Zip Code
92521
Jiang, Ji; Tam, Lok Ming; Wang, Pengcheng et al. (2018) Arsenite Targets the RING Finger Domain of Rbx1 E3 Ubiquitin Ligase to Inhibit Proteasome-Mediated Degradation of Nrf2. Chem Res Toxicol 31:380-387
Du, Hua; Leng, Jiapeng; Wang, Pengcheng et al. (2018) Impact of tobacco-specific nitrosamine-derived DNA adducts on the efficiency and fidelity of DNA replication in human cells. J Biol Chem 293:11100-11108
Wang, Pengcheng; Wang, Yinsheng (2018) Cytotoxic and mutagenic properties of O6-alkyl-2'-deoxyguanosine lesions in Escherichia coli cells. J Biol Chem 293:15033-15042
Wu, Jiabin; Wang, Pengcheng; Wang, Yinsheng (2018) Cytotoxic and mutagenic properties of alkyl phosphotriester lesions in Escherichia coli cells. Nucleic Acids Res 46:4013-4021
Dai, Xiaoxia; Wang, Tianlu; Gonzalez, Gwendolyn et al. (2018) Identification of YTH Domain-Containing Proteins as the Readers for N1-Methyladenosine in RNA. Anal Chem 90:6380-6384
Wu, Jun; Wang, Pengcheng; Li, Lin et al. (2018) Cytotoxic and mutagenic properties of minor-groove O2-alkylthymidine lesions in human cells. J Biol Chem 293:8638-8644
Leng, Jiapeng; Wang, Yinsheng (2017) Liquid Chromatography-Tandem Mass Spectrometry for the Quantification of Tobacco-Specific Nitrosamine-Induced DNA Adducts in Mammalian Cells. Anal Chem 89:9124-9130
Wang, Pengcheng; Amato, Nicholas J; Wang, Yinsheng (2017) Cytotoxic and Mutagenic Properties of C3'-Epimeric Lesions of 2'-Deoxyribonucleosides in Escherichia coli Cells. Biochemistry 56:3725-3732
Xu, Liang; Wang, Wei; Wu, Jiabin et al. (2017) Mechanism of DNA alkylation-induced transcriptional stalling, lesion bypass, and mutagenesis. Proc Natl Acad Sci U S A 114:E7082-E7091
Williams, Nicole L; Wang, Pengcheng; Wu, Jiabin et al. (2016) In Vitro Lesion Bypass Studies of O(4)-Alkylthymidines with Human DNA Polymerase ?. Chem Res Toxicol 29:669-75

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