Embryonic stem cells (ES cells) are pluripotent cells derived from the inner cell mass of the blastocyst-stage embryo. They can be used as a model system to study the molecular basis of pluripotency and fate-specification during early mammalian development. They can also be used to derive various types of cells for disease modeling, drug discovery, and the development of cell-based therapies. However, the success of these studies and applications critically depends on the understanding of the mechanisms that control ES cell self-renewal and differentiation. To systematically study ES cell self-renewal, we have previously carried out a genome-wide siRNA screen in mouse ES cells and successfully identified a list of novel genes that are important self-renewal. We are currently investigating the function of several of these novel genes in ES cells with biochemical, genetic, and genomic approaches. For example, we have recently shown that three of the Cnot family genes form a complex in ES cells and are required for both mouse and human ES cell self-renewal by inhibiting differentiation into extraembryonic lineages. We are now using biochemical and genetic experiments to further study the function of these genes in ES cells, induced pluripotent stem cells, and mouse embryogenesis. Using similar approaches, we are also investigating the roles of other novel self-renewal regulators. Besides the characterization of the above self-renewal factors, we are collaborating with the NTP and use chemical genetic approaches to probe and identify environmental chemicals that may affect human development. We are using human ES cells as an in vitro model to study the developmental toxicity of the environmental compounds, and we hope to gain a better understanding on the impact of environmental factors on human embryogenesis and embryonic development. Finally, we will continue to use functional genetic approaches to study the guided-differentiation of ES cells and the self-renewal of other types of stem cells. We also plan to study the expression and the roles of stem cell genes in cancer. We hope that our studies will facilitate the development of stem cell therapies, and identify novel therapeutic targets or diagnostic markers for cancer treatment. In summary, we use ES cells as a model system to investigate the mechanism of stem cell self-renewal and differentiation. Our studies will lead to a better understanding of developmental biology, and it will contribute to the advance of the therapeutic use of stem cells in regenerative medicine, as well as the use of stem cells in the study of environmental sciences.

Project Start
Project End
Budget Start
Budget End
Support Year
Fiscal Year
Total Cost
Indirect Cost
Zip Code
Bunch, Heeyoun; Lawney, Brian P; Burkholder, Adam et al. (2016) RNA polymerase II promoter-proximal pausing in mammalian long non-coding genes. Genomics 108:64-77
Zhou, Bingying; Wang, Li; Zhang, Shu et al. (2016) INO80 governs superenhancer-mediated oncogenic transcription and tumor growth in melanoma. Genes Dev 30:1440-53
Borkent, Marti; Bennett, Brian D; Lackford, Brad et al. (2016) A Serial shRNA Screen for Roadblocks to Reprogramming Identifies the Protein Modifier SUMO2. Stem Cell Reports 6:704-16
Wang, Li; Hu, Guang (2016) Remodeling super-enhancers and oncogenic transcription. Cell Cycle :1-2
Williams, Lucy H; Fromm, George; Gokey, Nolan G et al. (2015) Pausing of RNA polymerase II regulates mammalian developmental potential through control of signaling networks. Mol Cell 58:311-22
Yang, Pengyi; Zheng, Xiaofeng; Jayaswal, Vivek et al. (2015) Knowledge-Based Analysis for Detecting Key Signaling Events from Time-Series Phosphoproteomics Data. PLoS Comput Biol 11:e1004403
Wang, Li; Du, Ying; Ward, James M et al. (2014) INO80 facilitates pluripotency gene activation in embryonic stem cell self-renewal, reprogramming, and blastocyst development. Cell Stem Cell 14:575-91
Bunch, Heeyoun; Zheng, Xiaofeng; Burkholder, Adam et al. (2014) TRIM28 regulates RNA polymerase II promoter-proximal pausing and pause release. Nat Struct Mol Biol 21:876-83
Cinghu, Senthilkumar; Yellaboina, Sailu; Freudenberg, Johannes M et al. (2014) Integrative framework for identification of key cell identity genes uncovers determinants of ES cell identity and homeostasis. Proc Natl Acad Sci U S A 111:E1581-90
Tang, Shuang; Huang, Gang; Fan, Wei et al. (2014) SIRT1-mediated deacetylation of CRABPII regulates cellular retinoic acid signaling and modulates embryonic stem cell differentiation. Mol Cell 55:843-55

Showing the most recent 10 out of 21 publications