在CRX和NRL之间插入的DNA基基特异序列有助于RHODOPSIN表达
Rosa Maritato1, Alessia Medugno1, Emanuela D'Andretta1
1Department of Translational Medicine, University of Naples Federico II, Naples, Italy.
Scientific reports
|November 2, 2024
概括
转录因子 (TF) 和结合位点之间的DNA序列显著控制基因表达. 特定的DNA序列,而不仅仅是TF亲和力,决定了基因活动水平,揭示了新的基因调节层.
科学领域:
- 分子生物学分子生物学
- 遗传学 遗传学 是一个
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
背景情况:
- 基因表达依赖于转录因子 (TFs) 结合DNA cis调节序列.
- TF结合亲和力根据DNA序列组成而变化,影响细胞特异性基因表达.
- 在基因调节中,超出TF结合亲和度的DNA序列结构在基因调节中的作用尚未完全理解.
研究的目的:
- 调查转录因子 (TF) 和cis调控元素之间插入的DNA序列在控制基因表达中的作用.
- 为了确定DNA序列的组成和长度是否有助于TF活性和基因表达水平.
- 探索影响基因表达的cis-regulatory元素中的进化适应.
主要方法:
- 在RHODOPSIN (RHO) 基因促进体中,CRX和NRL转录因子之间的DNA链接序列的突变.
- 在人类和小鼠RHO基因之间交换同类的cis-regulatory元素.
- 准与DNA链接器的直角DNA结合蛋白,以评估它们对RHO表达的影响.
主要成果:
- 在CRX和NRLTF之间,DNA序列的组成和长度极大地控制了RHO基因表达水平.
- 在DNA链接序列中的突变导致了基因表达的不可预测的变异.
- 交换人类和小鼠的RHO cis-regulatory元素导致了相似的,但特定于物种的RHO表达模式.
- 当将DNA结合蛋白导向到DNA链接器时,观察到RHO表达的定向依赖激活或抑制.
结论:
- 除了TF结合部位之外,DNA序列包含了调控信息,这些信息决定了基因表达水平.
- 一个基于DNA的代码,取决于特定的基序和长度,影响TF活动并优化基因表达.
- 这项研究揭示了一种新的基因调节机制,其中DNA链接器本身积极参与控制基因表达.
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