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Identification of gene regulatory networks that control proliferative and neurogenic competence in mammalian Müller glia

鉴定控制哺乳动物穆勒神经胶质细胞增殖和神经发生能力的基因调控网络

基本信息

批准号：
10029171
负责人：
Seth Blackshaw
金额：
$ 50.53万
依托单位：
JOHNS HOPKINS UNIVERSITY
依托单位国家：
美国
项目类别：
财政年份：
2020
资助国家：
美国
起止时间：
2020-08-01 至 2024-05-31
项目状态：
已结题

来源：
https://reporter.nih.gov/project-details/10029171
关键词：
Adult CRISPR/Cas technology Catalogs Cell Cycle Cells Chromatin Clustered Regularly Interspaced Short Palindromic Repeats Competence Degenerative Disorder Differentiation and Growth Disease Family Gene Expression Gene Expression Profile Generations Genes Gliosis Goals Growth Factor Hour Individual Injury Mammals Mediating Molecular Morphology Muller&apos s cell Mus NFIA gene Natural regeneration Neuroglia Photoreceptors Predictive Factor Process Proliferating Radial Regulator Genes Rest Retina Retinal Diseases Retinal Dystrophy Retinal Photoreceptors Treatment Factor Work Zebrafish base cell type cold blooded vertebrate combinatorial design gene function insight loss of function mutant neurogenesis novel strategies overexpression regenerative regenerative therapy response to injury retinal damage retinal neuron retinal progenitor cell retinal rods therapy development transcription factor

项目摘要

Project Summary Müller glia of cold-blooded vertebrates can re-enter the cell cycle and rise to photoreceptors following retinal injury, while mammals have lost this ability. As part of the NEI Audacious Goals Initiative, we have conducted a ü comprehensive analysis of injury-induced changes in gene expression and chromatin accessibility in zebrafish, chick and mouse M ller glia, allowing us to identify both evolutionarily consüerved and species-specific gene regulatory networks that regulate glial reprogramming. This has identified a set of dedicated gene regulatory networks in mice tühat restrict proliferative and neurogenic competence in M ller glia. We aim to use these findings to gain a more complete insight into the molecular mechanisms that regulate neurogenic competence in mammalian M ller glia, and to develop treatments that can maximize generation of glial-derived photoreceptors while simultaneously not depleting the number of existing glia. To do this, we propose to generate individual loss of function mutants of the top candidate negative regulators of proliferative and ü neurogenic competence using AAV-mediated CRISPR/Cas9 gene disruption. We will first validate efficacy of sgRNAs targeting individual TFs, comprehensively profile chanüges in geüne expression in reactive M ller glia following loss of function of these genes, and characterize the fate of M ller glia-derived cells. We will then conduct combinatorial loss of function of negative regulators of M ller glia reprogramming to enhance generation ü of glial-derived retinal progenitor cells in wildtype and Nfia/b/x-deficient mice. Finally, we will combine CRISPR- mediated loss of function analysis with overexpression of Ascl1, Crx and Nrl to enhance generation of M ller glia-derived rod photoreceptors in both wildtype and dystrophic retina. We predict that these studies may substantially advance cell-based regenerative treatments aimed at restoring retinal photoreceptors lost due to blinding diseases.

项目总结