Integration of systems and synthetic biology to advance development of human tissues ex vivo

快速发展的干细胞生物工程和有机化合物技术领域面临着关键挑战：a)干细胞 衍生组织在发育上停滞不前，表现为胎儿期的表型b)它们通常缺乏 来自不同胚层的血管内皮细胞和基质细胞c)缺乏工具集 定量评估细胞或组织的特性和d)引导形态发生事件朝向其天然成体 表型。在这项提案中，我们将通过进行综合合成生物学和 系统生物学方法。我们最近利用人的IPSCs在体外产生了新的人胎肝有机化合物。 我们的方法需要通过在细胞中过表达GATA6转录因子来对人IPSCs进行基因工程 含碱性成纤维细胞生长因子和转化生长因子-β的多能培养液。通过这一策略，我们展示了人类内胚层的发展 和中胚层、细胞间的通讯、共分化和自组织培养成多个 细胞型胎肝器质。我们将利用这种组织作为开发和解决生物技术的独特试验台。 有机化合物体外成熟、评估和工程方面的挑战。通过本提案的目标1，我们 将开发和验证一套遗传工具集，以驱动多细胞组织的细胞命运重新编程。 通过目标2，我们将建立一个计算平台，以定量评估肝脏有机物质和识别 转录调控因子对特定阶段发育的影响：我们致力于改进和评估 人体体外有机物，干细胞生物工程的两个关键挑战。成功地完成这项工作 研究将产生一个假设驱动的框架，用于合理工程和干细胞来源的进展 体外组织。我们的研究还将产生接近成人肝脏的合成肝组织。它 减少对动物实验的依赖，增加获得精炼人体组织的机会。

The rapidly evolving field of stem cell bioengineering and organoids technology face key challenges: a) stem cell derived tissues are stalled developmentally and show fetal-stage phenotypes b) they often lack key subsets of vascular endothelial and stromal cells derived from different germ layers c) There is a lack of toolset to quantitatively assess cell or tissue identity and d) to guide morphogenetic events towards their native adult phenotypes. In this proposal, we will address these issues by undertaking an integrative synthetic biology and systems biology approach. We recently generated novel human fetal liver organoids ex vivo using human iPSCs. Our approach entails genetic engineering of human iPSCs via overexpression of GATA6 transcription factor in pluripotent media with bFGF and TGF-β. Through this strategy, we showed development of human endodermal and mesodermal, intercellular communications, co-differentiation and self-organization of cultures into a multi- cell type fetal liver organoid. We will employ this tissue as a unique testbed to develop and address biotechnology challenges for in vitro maturation, assessment and engineering of organoids. Through aim 1 of this proposal we will develop and validate a set of genetic toolset to drive cell-fate reprogramming of the multicellular tissue. Through aim 2, we will establish a computational platform to quantitatively assess liver organoids and to identify transcriptional regulators of stage specific development IMPACT: We tackle improvement and assessment of human organoids ex vivo, two key challenges in stem cell bioengineering. The successful completion of this study will result in a hypothesis-driven framework for rational engineering and advancement of stem cell-derived tissues ex vivo. Our study will also generate synthetic liver tissues with close proximity to adult human liver. It reduces dependence on animal experiments and increases access to refined human tissues.