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Chromatin Regulation of Epithelial Progenitor Cell Self-Renewal by Pygo2

Pygo2 对上皮祖细胞自我更新的染色质调节

基本信息

批准号：
7895610
负责人：
Xing Dai
金额：
$ 33.66万
依托单位：
UNIVERSITY OF CALIFORNIA-IRVINE
依托单位国家：
美国
项目类别：
财政年份：
2009
资助国家：
美国
起止时间：
2009-07-17 至 2011-06-30
项目状态：
已结题

来源：
https://reporter.nih.gov/project-details/7895610
关键词：
Adult Affinity Chromatography Animals Binding Biochemical Biological Biological Assay Biological Models Biological Process Cancer Etiology Cell Cycle Cell Proliferation Cell Size Cell model Cells Chromatin Complex Data Defect Development Disease Drosophila genus Epigenetic Process Epithelial Epithelial Cells Family Gene Activation Gene Expression Gene Family Gene Targeting Genes Genetic Goals Histone H3 Homeostasis Homologous Gene In Situ In Vitro Knock-out Knowledge Label Life Link Lysine MCF10A cells Maintenance Malignant - descriptor Malignant Neoplasms Mammals Mammary gland Measures Mediating Methyltransferase Modeling Molecular Molecular Target Mus Natural regeneration Nuclear Organism Population Proliferating Proteins Regulation Reporter Research Reverse Transcriptase Polymerase Chain Reaction Role SET Domain Signal Transduction Skin Stem cells Technology Testing Therapeutic Intervention Thinking Tissues Transgenic Mice Work base cancer cell cancer therapy cell type chromatin immunoprecipitation chromatin modification design empowered histone modification human disease inhibitor/antagonist insight interdisciplinary approach interest malignant breast neoplasm mammary epithelium mouse model mutant novel overexpression paralogous gene postnatal precursor cell progenitor promoter prototype research study self-renewal stem stem cell therapy therapeutic target

项目摘要

Many epithelial tissues such as mammary glands can self-renew continuously in adult life. During development and regeneration, a pool of epithelial stem/progenitor cells proliferate and differentiate to generate multiple cell types. The long-term goal of our research is to use a multidisciplinary approach to study both genetic and epigenetic mechanisms that control the formation, maintenance, and differentiation of these stem/progenitor cells. This proposal focuses on investigating the role of mouse pygopus 2 (Pygo2) gene, which encodes an epigenetic activator, using mammary stem/progenitor cells as a model system. The first specific aim is to identify critical downstream targets of Pygo2 in mammary stem/progenitor cells. Stem/progenitor cell-enriched populations will be prepared from mammary epithelia of normal and Pygo2-deficient animals for transcriptional profiling and RT-PCR analysis to identify Pygo2-responsive genes. In situ expression, chromatin immunoprecipitation and reporter assays will then be performed to test whether Pygo2 directly activates putative stem/progenitor cell-specific genes and whether Pygo2 increases histone H3 K4 trimetylation at these target loci. The second specific aim is to test the hypothesis that Pygo2 functions in mammary stem/progenitor cell self-renewal by binding to K4-di- and tri-methylated histone H3 (H3K4me2/3, active marks of chromatin) and SET domain histone H3 K4 methyltransferase (HMT) complexes. Wild-type and mutant Pygo2 proteins deficient in H3K4me2/3 and/or HMT binding will be tested in progenitor cell expansion assays. Tandem affinity purification and mass spectrometric protein identification will be performed to identify the specific HMT and its associating factors in mammary progenitor cells. The significance of the proposed studies are several-fold: 1) they will aid our understanding of how normal development and homeostasis of epithelial stem/progenitor cells is regulated at genetic and epigenetic levels; 2) such knowledge will provide a framework for our thinking on epithelial cancers, as cancer cells are known to re-activate developmentally important genes in an adult setting; 3) knowledge on novel molecular interactions involving Pygo2 may implicate possible targets for therapeutic intervention of epithelial diseases or cancers of a stem/progenitor cell origin.

许多上皮组织，如乳腺，可以在体内不断自我更新。成人生活。在发育和再生过程中，上皮干细胞/祖细胞库细胞增殖和分化以产生多种细胞类型。长期目标是我们的研究是使用多学科方法来研究遗传和表观遗传控制这些细胞的形成、维持和分化的机制干/祖细胞。该提案重点研究小鼠尾部的作用 2 (Pygo2) 基因，使用乳腺干/祖细胞编码表观遗传激活剂细胞作为模型系统。第一个具体目标是确定关键的下游目标乳腺干/祖细胞中的 Pygo2。富含干细胞/祖细胞的群体将从正常和 Pygo2 缺陷动物的乳腺上皮中制备转录谱和 RT-PCR 分析以鉴定 Pygo2 响应基因。原位然后将进行表达、染色质免疫沉淀和报告分析测试 Pygo2 是否直接激活假定的干细胞/祖细胞特异性基因 Pygo2 是否会增加这些目标位点的组蛋白 H3 K4 三甲基化。第二个具体目的是检验 Pygo2 在乳腺干/祖细胞中发挥作用的假设通过结合 K4-二甲基化和三甲基化组蛋白 H3（H3K4me2/3，活性染色质标记）和 SET 结构域组蛋白 H3 K4 甲基转移酶 (HMT) 复合物。缺乏 H3K4me2/3 和/或 HMT 的野生型和突变型 Pygo2 蛋白结合将在祖细胞扩增测定中进行测试。串联亲和纯化并进行质谱蛋白质鉴定以鉴定特定的乳腺祖细胞中的 HMT 及其相关因子。的意义拟议的研究有几个方面：1）它们将帮助我们了解正常情况如何上皮干细胞/祖细胞的发育和稳态在遗传上受到调节和表观遗传水平； 2）这些知识将为我们的思考提供一个框架上皮癌，因为已知癌细胞会重新激活对发育至关重要的细胞成人环境中的基因； 3) 有关 Pygo2 的新型分子相互作用的知识可能暗示上皮疾病治疗干预的可能目标或干细胞/祖细胞起源的癌症。