Promoter architecture and enhancer-driven regulation of Cdh1 during MET

IF 3.5 3区 生物学 Q3 CELL BIOLOGY
Neslihan Toyran , Hani Alotaibi
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引用次数: 0

Abstract

E-cadherin (Cdh1) reactivation is a hallmark of the mesenchymal-to-epithelial transition (MET); however, the direct regulatory mechanisms controlling Cdh1 promoter activity remain incompletely understood. Here, we systematically analyzed the responsiveness of the Cdh1 promoter to MET-associated transcription factors using luciferase reporter assays and chromatin immunoprecipitation. An extended Cdh1 promoter fragment exhibited strong basal activity but limited modulation during EMT or MET. Promoter truncation modestly increased basal activity but was insufficient for robust activation. In contrast, integrating a Grhl3-responsive enhancer dramatically enhanced promoter responsiveness, enabling activation by Grhl3 and cooperative enhancement with Hnf4α. Chromatin immunoprecipitation confirmed Grhl3 enrichment at the Cdh1 promoter region during MET, consistent with the enhanced promoter responsiveness observed upon enhancer integration. These findings demonstrate that the dynamic regulation of Cdh1 expression during epithelial plasticity requires coordinated enhancer-promoter interactions and transcription factor recruitment to overcome intrinsic promoter constraints.
MET期间Cdh1的启动子结构和增强子驱动调控
e -钙粘蛋白(Cdh1)再激活是间质向上皮转化(MET)的标志;然而,控制Cdh1启动子活性的直接调控机制仍不完全清楚。在这里,我们系统地分析了Cdh1启动子对met相关转录因子的响应性,使用荧光素酶报告基因检测和染色质免疫沉淀。延长的Cdh1启动子片段在EMT或MET期间表现出很强的基础活性,但调节有限。启动子截断适度地增加了基础活性,但不足以产生强大的激活。相比之下,整合Grhl3响应增强子显著提高了启动子的响应性,使Grhl3激活并与Hnf4α协同增强成为可能。染色质免疫沉淀证实,MET期间,Grhl3在Cdh1启动子区域富集,这与增强子整合后观察到的启动子响应性增强一致。这些发现表明,在上皮可塑性过程中,Cdh1表达的动态调控需要增强子-启动子相互作用和转录因子募集的协调,以克服内在启动子的限制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Experimental cell research
Experimental cell research 医学-细胞生物学
CiteScore
7.20
自引率
0.00%
发文量
295
审稿时长
30 days
期刊介绍: Our scope includes but is not limited to areas such as: Chromosome biology; Chromatin and epigenetics; DNA repair; Gene regulation; Nuclear import-export; RNA processing; Non-coding RNAs; Organelle biology; The cytoskeleton; Intracellular trafficking; Cell-cell and cell-matrix interactions; Cell motility and migration; Cell proliferation; Cellular differentiation; Signal transduction; Programmed cell death.
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