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通过ecdysone受体对胰岛素受体基因复杂增强剂进行长距离抑制

Katie Thompson¹, Will Suber², Rachel Nicholas¹

¹Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, Michigan.

bioRxiv : the preprint server for biology

|June 9, 2023

概括

研究人员研究了果中胰岛素受体基因 (INSR) 的调节. 他们发现复杂的内部元素控制基因表达,挑战了INSR作为简单的家政基因的想法.

科学领域:

遗传学和分子生物学:研究胰岛素受体基因 (INSR) 复杂的转录调节.

背景情况:

胰岛素信号通路对发育和新陈代谢至关重要,其调节不当与糖尿病等疾病有关.
虽然INSR变种与代谢条件有关,但其转录调节,特别是内基元素,仍然不太了解.
虽然INSR曾被认为是家庭管理基因,但有证据表明细胞类型的特定和动态调节.

研究的目的:

* 描述Drosophila InR基因位点内的cis调节元件的子结构和调节机制.
* 调查ecdysone受体 (EcR) 和dFOXO转录因子在调节INR表达中的作用.
* 了解INR局部内的多种增强剂的复杂相互作用和作用模式.

主要方法:

*使用露西法酶试验来表征Drosophila S2细胞中的cis调节元件.
*研究了EcR对特定增强剂的直接作用,包括远程抑制.
*分析了dFOXO和20E对单个和相邻增强剂的影响,以评估附加性.

主要成果:

* Ecdysone受体 (EcR) 显示了Enhancer 2的双模调节,在没有20E的情况下抑制,在存在时激活.
* 具有至少475bp的长距离抑制特征,在增强剂作用下.
*dFOXO和20E对调节元件表现出截然不同的影响,它们对相邻增强剂的影响并不总是附加的,这表明了复杂的调节逻辑.

结论:

InR的非编码内基因区域显示动态和细胞类型特定的基因调节,表明复杂的转录电路.
在InR位点内的增强剂作用可以局部化或分布,挑战简单的添加模型.
需要进一步的体内研究来阐明这些元素如何产生微调的,组织特异的表达模式.

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