The primary interest of my group is mouse genetics and mammary gland tumorigenesis using animal model systems. We have been studying three groups of genes, including functions of fibroblast growth factor receptors (FGFRs), Smad genes, and breast tumor suppressor gene (BRCA1). We are currently focusing on functional analysis of BRCA1 in cell cycle checkpoint, genetic stability, aging and tumorigenesis. Breast cancer is the most common cancer and the second leading cause of cancer mortality in women, with approximately one in 9 being affected over their lifetime. In the past several years, we have introduced a series of mutations-including a null mutation, an isoform mutation, and a conditional mutation-into the mouse BRCA1 locus. Mutational analyses at both cellular and whole animal levels demonstrated that the primary function of BRCA1 is to maintain genome integrity through its control over the G2-M cell cycle checkpoint and centrosome duplication. BRCA1 mutations result in genetic instability, which then activates cellular protection mechanisms, including cell-cycle checkpoints and programmed cell death, to eliminate the mutant cells. This is why BRCA1 mutant cells fail to grow in culture. On the other hand, the genetic instability in BRCA1 mutant cells theoretically increases mutation rates of all genes, including tumor suppressors and oncogenes, which ultimately overcomes the proliferation defects caused by the BRCA1 loss and results in tumor formation. We are continuing to study mechanisms of BRCA1 associated tumorigenesis and seeking efficient ways to prevent the transformation process from happening.

Agency
National Institute of Health (NIH)
Institute
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
Type
Intramural Research (Z01)
Project #
1Z01DK056001-06
Application #
6984022
Study Section
(GDDB)
Project Start
Project End
Budget Start
Budget End
Support Year
6
Fiscal Year
2004
Total Cost
Indirect Cost
Name
U.S. National Inst Diabetes/Digst/Kidney
Department
Type
DUNS #
City
State
Country
United States
Zip Code
Lahusen, Tyler J; Deng, Chu-Xia (2015) SRT1720 induces lysosomal-dependent cell death of breast cancer cells. Mol Cancer Ther 14:183-92
Cao, Liu; Xu, Xiaoling; Cao, Longyue L et al. (2007) Absence of full-length Brca1 sensitizes mice to oxidative stress and carcinogen-induced tumorigenesis in the esophagus and forestomach. Carcinogenesis 28:1401-7
Tominaga, Y; Wang, A; Wang, R-H et al. (2007) Genistein inhibits Brca1 mutant tumor growth through activation of DNA damage checkpoints, cell cycle arrest, and mitotic catastrophe. Cell Death Differ 14:472-9
Kim, Sang Soo; Cao, Liu; Lim, Sung-Chul et al. (2006) Hyperplasia and spontaneous tumor development in the gynecologic system in mice lacking the BRCA1-Delta11 isoform. Mol Cell Biol 26:6983-92
Xu, Xiaoling; Kobayashi, Shogo; Qiao, Wenhui et al. (2006) Induction of intrahepatic cholangiocellular carcinoma by liver-specific disruption of Smad4 and Pten in mice. J Clin Invest 116:1843-52
Wang, X; Zhou, Y-X; Qiao, W et al. (2006) Overexpression of aurora kinase A in mouse mammary epithelium induces genetic instability preceding mammary tumor formation. Oncogene 25:7148-58
Deng, Chu-Xia (2006) BRCA1: cell cycle checkpoint, genetic instability, DNA damage response and cancer evolution. Nucleic Acids Res 34:1416-26
Park, Changwon; Lavine, Kory; Mishina, Yuji et al. (2006) Bone morphogenetic protein receptor 1A signaling is dispensable for hematopoietic development but essential for vessel and atrioventricular endocardial cushion formation. Development 133:3473-84
De Soto, Joseph A; Deng, Chu-Xia (2006) PARP-1 inhibitors: are they the long-sought genetically specific drugs for BRCA1/2-associated breast cancers? Int J Med Sci 3:117-23
Oppermann, Mona; Mizel, Diane; Huang, George et al. (2006) Macula densa control of renin secretion and preglomerular resistance in mice with selective deletion of the B isoform of the Na,K,2Cl co-transporter. J Am Soc Nephrol 17:2143-52

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