Epigenetic mechanisms of gene regulation contribute significantly to normal development and disease pathogenesis. Our long-term goal is to understand the epigenetic mechanisms involved in stem cell fate choice, using the development of hematopoietic stem cells (HSCs) from embryonic stem cells (ESCs) as our model. Since HSCs can be derived in vitro by directed differentiation of embryonic stem cells (ESCs), this procedure holds great promise for cell-based therapy of hematological disorders. However, compared to later stages of HSC differentiation that give rise to various blood cell lineages, epigenetic mechanisms controlling HSC fate specification from ESCs are poorly understood, impeding efforts to develop an efficient protocol for in vitro derivation of HSCs. Our preliminary data suggest that dynamic and combinatorial chromatin modifications are critical to this process. This application seeks to obtain a systems-level understanding of epigenetic regulation of HSC fate by coupling wet-lab experiments with computational modeling. Specifically, we propose to understand the dynamic and gene network aspects of epigenetic regulation. To this end, we hypothesize that dynamic combination of chromatin modifications modulates the expression of key regulators of HSC development. First, we will map genome-wide chromatin modifications at different stages of the ESC-to-HSC transition. Second, using computational tools developed in our lab and chromatin state maps, we will predict and experimentally validate regulatory DNA elements acting at different stages of the developmental process. Finally, we will develop a novel computational tool for integrating chromatin state maps with other genomics data to uncover gene pathways controlling HSC fate choice. We believe that these systems-level studies will reveal the basic principles of epigenetic regulation in development. Further, the specific knowledge of epigenetic regulation in HSCs will fill a critical knowledge gap in HSC fate specification.
Embryonic stem cells (ESCs) hold great promise for regenerative medicine because of its ability to give rise to all tissue-specific stem cells in the human body. To fulfill this promise, accurate and efficient protocols are needed to differentiate ESCs to tissue-specific stem cells, such as hematopoietic stem cells. A better understanding of the epigenetic mechanisms governing stem cell fate choice will allow us to develop improved differentiation protocols for the generation of tissue-specific stem cells from ESCs.
|He, Bing; Chen, Changya; Teng, Li et al. (2014) Global view of enhancer-promoter interactome in human cells. Proc Natl Acad Sci U S A 111:E2191-9|
|Ma, Xiaoke; Gao, Long; Tan, Kai (2014) Modeling disease progression using dynamics of pathway connectivity. Bioinformatics 30:2343-50|
|Steinke, Farrah C; Yu, Shuyang; Zhou, Xinyuan et al. (2014) TCF-1 and LEF-1 act upstream of Th-POK to promote the CD4(+) T cell fate and interact with Runx3 to silence Cd4 in CD8(+) T cells. Nat Immunol 15:646-56|
|Teng, Li; He, Bing; Gao, Peng et al. (2014) Discover context-specific combinatorial transcription factor interactions by integrating diverse ChIP-Seq data sets. Nucleic Acids Res 42:e24|
|Li, Yan; Esain, Virginie; Teng, Li et al. (2014) Inflammatory signaling regulates embryonic hematopoietic stem and progenitor cell production. Genes Dev 28:2597-612|
|Dogan, Meeshanthini V; Shields, Bridget; Cutrona, Carolyn et al. (2014) The effect of smoking on DNA methylation of peripheral blood mononuclear cells from African American women. BMC Genomics 15:151|