Mechanisms Underlying Tissue Fragility in Ectodermal Dysplasias

外胚层发育不良组织脆性的潜在机制

• 批准号: 9569262
• 负责人: Peter J. Koch
• 金额: $ 45.74万
• 依托单位: UNIVERSITY OF COLORADO DENVER
• 依托单位国家: 美国
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-09-21 至 2022-07-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/9569262
• 关键词: Adhesions; Affect; Antibodies; Binding; Binding Sites; Biologic Characteristic; Biological Assay; Biology; Cell Adhesion; Cell Differentiation process; Cell surface; Cell-Cell Adhesion; Cells; Complement; Complex; Data; Defect; Desmosomes; Development; Disease; Down-Regulation; Ectoderm; Ectodermal Dysplasia; Extracellular Matrix; Gene Expression; Gene Targeting; Genes; Genetic; Genetic Recombination; Goals; Hemidesmosomes; Homeostasis; Human; Impairment; Individual; Inherited; Integrins; Intercellular Junctions; Killer Cells; Lead; Ligands; Link; Mediating; Missense Mutation; Modeling; Molecular; Morphology; Mutation; Pathway interactions; Patients; Phenotype; Proteins; Proteome; Proteomics; Regulator Genes; Regulatory Element; Reporter; Role; SHFM1 gene; Signal Pathway; Signal Transduction; Site; Skin; Skin Abnormalities; Source; Structure; System; Testing; Tissues; base; developmental disease; experimental study; genome editing; induced pluripotent stem cell; innovation; insight; keratinocyte; keratinocyte differentiation; migration; molecular pathology; mouse model; mutant; novel strategies; patient subsets; protein complex; receptor; skin disorder; skin lesion; stem cell technology; therapeutic target; tool; transcription factor; transcriptome

TP63 is a transcription factor required for the normal development and homeostasis of the skin. Missense mutations in the TP63 gene are linked to a subset of severe developmental disorders, termed ectodermal dysplasias. Our application focuses on two of these, ankyloblepharon ectodermal dysplasia and clefting (AEC) and ectrodactyly ectodermal dysplasia and clefting (EEC), as they are each associated with severe skin erosions. Although EEC has historically not been associated with skin abnormalities, they do occur in a subset of patients (we refer to these patients as EEC/S patients). It is currently not clear how TP63-AEC or TP63-EEC/S mutations lead to the observed skin defects, specifically abnormalities in keratinocyte differentiation, cell- cell adhesion, and cell-extracellular matrix adhesion. While a few deregulated genes associated with AEC have been described, essentially nothing is known regarding the disease mechanism underlying EEC/S. The main goal of this application is to elucidate the cellular and molecular defects underlying AEC and EEC/S and to expand our understanding of the role of TP63 in normal keratinocyte biology. Based on our preliminary data, we hypothesize that desmosomal adhesion and hemidesmosomal adhesion are impaired in AEC and EEC/S patient skin, leading to the observed skin fragility. Further, our results suggest that impaired desmosomal signaling contributes to epidermal differentiation defects in patient skin. The current proposal will establish mechanistic insights into the molecular pathology underlying skin fragility in TP63-related ectodermal dypslasias. Further, we will gain new insights into the epidermal function of TP63, which will broaden our understanding of skin biology in general.

TP63 是皮肤正常发育和体内平衡所需的转录因子。 TP63 基因的错义突变与一部分严重发育障碍有关， 称为外胚层发育不良。我们的应用集中于其中的两个，ankyloblepharon 外胚层发育不良和裂开 (AEC) 和外指外胚层发育不良和裂开 （EEC），因为它们都与严重的皮肤糜烂有关。尽管EEC历史上没有 虽然与皮肤异常有关，但它们确实发生在一部分患者中（我们将这些称为 患者作为 EEC/S 患者）。目前尚不清楚 TP63-AEC 或 TP63-EEC/S 突变是如何发生的 导致观察到的皮肤缺陷，特别是角质形成细胞分化、细胞- 细胞粘附和细胞-细胞外基质粘附。虽然一些失调的基因相关 尽管已经描述了 AEC，但基本上对疾病机制一无所知 底层 EEC/S。该应用的主要目标是阐明细胞和 AEC 和 EEC/S 的分子缺陷并扩大我们对 TP63 在正常角质形成细胞生物学中的作用。根据我们的初步数据，我们 假设 AEC 中桥粒粘附和半桥粒粘附受损 EEC/S 患者皮肤，导致观察到皮肤脆弱。此外，我们的结果表明 桥粒信号传导受损会导致患者皮肤的表皮分化缺陷。 当前的提案将为潜在的分子病理学建立机制见解 TP63 相关外胚层发育不良的皮肤脆弱性。此外，我们还将获得新的见解 TP63 的表皮功能，这将拓宽我们对皮肤生物学的总体理解。