) Genomic instability is a hallmark of cancer cells. Defects in multiple cellular processes, including DNA repair and cell cycle checkpoint control, can give rise to this phenotype. Recent studies have provided evidence for a link between aberrant DNA double-strand break (DSB) repair and inherited forms of cancer. The overall goal of this program project is to elucidate the molecular mechanisms of DSB repair and to examine the regulation of this process by the products of the tumor suppressor genes BRCA1, BRCA2 and ATM. We hypothesize that abnormalities in DSB repair, which may be in the DNA damage sensing mechanisms, signal transduction responses, or in the repair process itself, are an important causative factor in many human cancers. This research program combines biochemical, cellular, and genetic approaches to delineate the assembly and mechanism of action of DSB repair machinery, how tumor suppressor gene products modulate cellular responses to DNA damage, and how inactivation of tumor suppressor genes results in genomic instability, leading to cancer formation. The individual projects will study: (1) the initiation of DSB repair including break processing by the Mre11/Rad50/p95 nuclease and heteroduplex formation by Rad51 and associated proteins; (2) the DNA synthesis and ligation steps that are required for the completion of DSB repair; (3) the modulation of the DSB repair machinery by an ATM-mediated kinase cascade; (4) the modulation of the DNA repair machinery by BRCA1, BRCA2, and two novel protein factors MLB1 and RLB1. The research projects will be supported by core facilities for animal studies, nucleic acid and protein analyses, and imaging, along with an administrative core. These highly integrated projects will interact synergistically to enhance our knowledge of a complex multi-component DNA repair system that plays a critical role in the maintenance of genomic stability. Results from these studies will form the basis for new strategies in cancer detection, prevention, and treatment.

Agency
National Institute of Health (NIH)
Institute
National Cancer Institute (NCI)
Type
Research Program Projects (P01)
Project #
5P01CA081020-02
Application #
6377091
Study Section
Subcommittee G - Education (NCI)
Program Officer
Pelroy, Richard
Project Start
2000-06-05
Project End
2004-05-31
Budget Start
2001-06-01
Budget End
2002-05-31
Support Year
2
Fiscal Year
2001
Total Cost
$1,196,764
Indirect Cost
Name
University of Texas Health Science Center San Antonio
Department
Other Basic Sciences
Type
Schools of Medicine
DUNS #
800772162
City
San Antonio
State
TX
Country
United States
Zip Code
78229
Yang, Hui; Matsumoto, Yoshihiro; Trujillo, Kelly M et al. (2015) Role of the yeast DNA repair protein Nej1 in end processing during the repair of DNA double strand breaks by non-homologous end joining. DNA Repair (Amst) 31:1-10
Daley, James M; Niu, Hengyao; Sung, Patrick (2013) Roles of DNA helicases in the mediation and regulation of homologous recombination. Adv Exp Med Biol 767:185-202
Daley, James M; Sung, Patrick (2013) RIF1 in DNA break repair pathway choice. Mol Cell 49:840-1
Shu, Zhanyong; Vijayakumar, Sangeetha; Chen, Chi-Fen et al. (2004) Purified human SUV3p exhibits multiple-substrate unwinding activity upon conformational change. Biochemistry 43:4781-90
Tan, Wei; Zheng, Lei; Lee, Wen-Hwa et al. (2004) Functional dissection of transcription factor ZBRK1 reveals zinc fingers with dual roles in DNA-binding and BRCA1-dependent transcriptional repression. J Biol Chem 279:6576-87
Ting, Nicholas S Y; Lee, Wen-Hwa (2004) The DNA double-strand break response pathway: becoming more BRCAish than ever. DNA Repair (Amst) 3:935-44
Motycka, Teresa A; Bessho, Tadayoshi; Post, Sean M et al. (2004) Physical and functional interaction between the XPF/ERCC1 endonuclease and hRad52. J Biol Chem 279:13634-9
Utomo, Ahmad; Jiang, Xianzhi; Furuta, Saori et al. (2004) Identification of a novel putative non-selenocysteine containing phospholipid hydroperoxide glutathione peroxidase (NPGPx) essential for alleviating oxidative stress generated from polyunsaturated fatty acids in breast cancer cells. J Biol Chem 279:43522-9
Lin, Horng-Ru; Ting, Nicholas S Y; Qin, Jun et al. (2003) M phase-specific phosphorylation of BRCA2 by Polo-like kinase 1 correlates with the dissociation of the BRCA2-P/CAF complex. J Biol Chem 278:35979-87
Post, Sean M; Tomkinson, Alan E; Lee, Eva Y-H P (2003) The human checkpoint Rad protein Rad17 is chromatin-associated throughout the cell cycle, localizes to DNA replication sites, and interacts with DNA polymerase epsilon. Nucleic Acids Res 31:5568-75

Showing the most recent 10 out of 28 publications