与DNMT1的RNA相互作用阻断了FMR1位点的DNA甲基化
Veronica Nobile1,2, Benedetta Niccolini1,2,3, Cecilia Pucci1
1Dipartimento di Scienze della Vita e Sanità Pubblica, Sezione di Medicina Genomica, Università Cattolica del Sacro Cuore, Largo F. Vito 1, 00168 Rome, Italy.
NAR molecular medicine
|February 4, 2026
概括
在FMR1基因中非甲基化CGG扩张可以预防脆弱X综合征 (FXS). DNMT1与FMR1mRNA或基因位点结合,调节甲基化,为FXS基因的重新激活提供了目标.
科学领域:
- 遗传学 是一个遗传学.
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 分子生物学分子生物学
背景情况:
- 脆弱X综合征 (FXS) 是由FMR1基因的CGG三重扩张 (>200次重复) 引起的,导致DNA甲基化和基因沉默.
- 由于非甲基化等位基,具有较大的CGG扩张 (>200) 的罕见个体在表型上保持正常,这表明存在保护机制.
研究的目的:
- 为了研究活跃的FMR1转录调节局部DNA甲基化通过mRNA结合DNMT1.1的假设.
- 探索DNMT1作为在FXS中重新激活FMR1基因表达的潜在治疗标.
主要方法:
- 评估了DNMT1与FMR1mRNA和FMR1位点的结合,在转录活跃细胞与FXS细胞之间.
- 使用特定药物调节FMR1转录,并观察到相应的DNMT1结合.
- 在一项概念验证研究中,使用DNMT1抑制的体体证明了FMR1基因的活性.
主要成果:
- 在转录活性细胞中,DNMT1与FMR1mRNA结合,防止局部甲基化.
- 在FXS细胞中,DNMT1与FMR1位点结合,导致基因沉默.
- 用药物调节FMR1转录改变了DNMT1的结合模式.
- 抑制DNMT1的阿普坦酶成功地重新激活了被沉默的FMR1基因.
结论:
- 在FMR1基因调节中,DNMT1起着双重作用,结合mRNA以防止甲基化,或结合局部以沉默转录.
- DNMT1是潜在的治疗策略的关键分子标,旨在在脆弱X综合征中重新激活FMR1表达.
相关概念视频
02:53Ribosomal RNA Synthesis
14.9K
Ribosome synthesis is a highly complex and coordinated process involving more than 200 assembly factors. The synthesis and processing of ribosomal components occurs not only in the nucleolus but also in the nucleoplasm and the cytoplasm of eukaryotic cells.
Ribosome biogenesis begins with the synthesis of 5S and 45S pre-rRNAs by distinct RNA polymerases. The primary transcripts are extensively processed and modified before they are bound and folded by ribosomal proteins and assembly factors,...
Ribosome biogenesis begins with the synthesis of 5S and 45S pre-rRNAs by distinct RNA polymerases. The primary transcripts are extensively processed and modified before they are bound and folded by ribosomal proteins and assembly factors,...
14.9K
02:36RNA Polymerase II Accessory Proteins
11.0K
Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...
11.0K
01:26Locus of Control
224
Locus of control describes how individuals perceive the causes of events in their lives, influencing motivation and well-being. Introduced by Julian Rotter in 1954, it is categorized into internal and external locus of control.Internal Locus of ControlIndividuals with an internal locus of control believe their actions determine outcomes, fostering responsibility, self-efficacy, and motivation. For example, an employee may attribute career success to hard work. Research links this mindset to...
224
01:19Root-Locus Method
514
A cruise control system in a car is designed to maintain a specified speed automatically by adjusting the gas pedal. The system continuously measures the vehicle's speed and makes fine adjustments to the pedal to achieve this goal. The root locus method is particularly useful for understanding how the cruise control system's behavior changes under varying conditions, such as when the car goes uphill, downhill, or faces strong wind resistance.
This system can be represented by a block...
This system can be represented by a block...
514
01:15Construction of Root Locus
419
The construction of a root locus involves several key steps to analyze and visualize the behavior of a system's poles with varying gain. The number of branches in the root locus equals the number of closed-loop poles and is symmetrical about the real axis.
For positive gain values, the root locus exists on the real axis to the left of an odd number of finite open-loop poles or zeros. The root locus starts at the open-loop poles and traces the paths of the closed-loop poles as the gain...
For positive gain values, the root locus exists on the real axis to the left of an odd number of finite open-loop poles or zeros. The root locus starts at the open-loop poles and traces the paths of the closed-loop poles as the gain...
419
01:05Properties of the Root Locus
307
The root locus method is an invaluable tool for analyzing higher-order systems without needing to factor the denominator of the transfer function. A pole of the system is identified when the characteristic polynomial in the transfer function's denominator equals zero.
To determine if a point lies on the root locus, the criterion involves the sum of angles contributed by all poles and zeros to that point. Specifically, this sum must be an odd multiple of 180 degrees. The gain at any point on...
To determine if a point lies on the root locus, the criterion involves the sum of angles contributed by all poles and zeros to that point. Specifically, this sum must be an odd multiple of 180 degrees. The gain at any point on...
307