相关实验视频
Updated: Feb 2, 2026

13:04
Overexpressing Long Noncoding RNAs Using Gene-activating CRISPR
Published on: March 1, 2019
9.3K
激活RNA与调解器结合,以增强染色体结构和转录
Fan Lai1, Ulf A Orom, Matteo Cesaroni
1The Wistar Institute, 3601 Spruce Street, Philadelphia, Pennsylvania 19104, USA.
Nature
|February 19, 2013
概括
激活长非编码RNAs (lncRNAs) 招募中介复合体来激活邻近的基因. 这种相互作用对基因调节至关重要,并且在疾病中受损,突出显示了中介在ncRNA-a功能中的作用.
科学领域:
- 基因组学就是基因组学.
- 分子生物学分子生物学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
背景情况:
- 基因组研究揭示了许多非蛋白质编码的转录,包括长非编码RNA (lncRNAs).
- 虽然 lncRNAs 已知具有表观遗传作用,如X染色体不活化,但它们的多样性功能仍在研究中.
- 一个特定的类,ncRNA激活 (ncRNA-a),通过cis介导机制激活邻近的基因.
研究的目的:
- 为了阐明增强剂类ncRNA-a功能的精确机制.
- 确定转录辅助激活器复合组件在ncRNA依赖基因激活中的作用.
- 研究ncRNA-a与基因调节中的中介体复合体之间的相互作用.
主要方法:
- 人类HEK293细胞中已知的转录激活因子的消耗.
- 异质记者测定用于评估依赖RNA的转录激活.
- 在体内研究涉及调解者招募,染色体定位和酶活性测试.
- 染色体构造捕获用于分析ncRNA-a位点和目标基因之间的DNA循环.
主要成果:
- 调解器复合组件的耗尽显著降低了ncRNA-a诱导的转录.
- 介质复合体在体内被招募到ncRNA-a目标基因中,调节它们的表达.
- ncRNA-a与中介相互作用,影响其染色质局部化和素H3血清10激酶活性.
- 与疾病相关的调解者复合体显示与激活ncRNAs的相互作用减少.
- 媒介体或ncRNA-a的耗尽破坏了ncRNA-a位置和目标基因之间的DNA循环.
结论:
- 人类中间体复合体作为激活ncRNAs的传感器.
- 中介和激活ncRNA之间的关联对基因调节至关重要.
- 损伤介质和激活ncRNA相互作用与人类疾病有关.
相关概念视频
Eukaryotic Transcription Activators
12.8K
Transcription activators are proteins that promote the transcription of genes from DNA to RNA. In most cases, these proteins contain two separate domains ‒ a domain that binds to DNA and a domain for activating transcription; however, in some cases, a single domain is responsible for both binding and activation of transcription, as seen in the glucocorticoid receptor and MyoD.
The binding domains are capable of recognizing and interacting with regulatory sequences on the DNA. These...
The binding domains are capable of recognizing and interacting with regulatory sequences on the DNA. These...
12.8K
Transcription Elongation Factors
13.9K
Transcription elongation is a dynamic process that alters depending upon the sequence heterogeneity of the DNA being transcribed. Hence, it is not surprising that the elongation complex's composition also varies along the way while transcribing a gene.
The transcription elongation is regulated via pausing of RNA polymerase on several occasions during transcription. In bacteria, these halts are necessary because the transcription of DNA into mRNA is coupled to the translation of that mRNA...
The transcription elongation is regulated via pausing of RNA polymerase on several occasions during transcription. In bacteria, these halts are necessary because the transcription of DNA into mRNA is coupled to the translation of that mRNA...
13.9K
Prokaryotic Transcriptional Activators and Repressors
25.5K
The organization of prokaryotic genes in their genome is notably different from that of eukaryotes. Prokaryotic genes are organized, such that the genes for proteins involved in the same biochemical process or function are located together in groups. This group of genes, along with their regulatory elements, are collectively known as an operon. The functional genes in an operon are transcribed together to give a single strand of mRNA known as polycistronic mRNA.
Transcription of prokaryotic...
Transcription of prokaryotic...
25.5K
lncRNA - Long Non-coding RNAs
9.9K
In humans, more than 80% of the genome gets transcribed. However, only around 2% of the genome codes for proteins. The remaining part produces non-coding RNAs which includes ribosomal RNAs, transfer RNAs, telomerase RNAs, and regulatory RNAs, among other types. A large number of regulatory non-coding RNAs have been classified into two groups depending upon their length – small non-coding RNAs, such as microRNA, which are less than 200 nucleotides in length, and long non-coding RNA...
9.9K
siRNA - Small Interfering RNAs
18.6K
Small interfering RNAs, or siRNAs, are short regulatory RNA molecules that can silence genes post-transcriptionally, as well as the transcriptional level in some cases. siRNAs are important for protecting cells against viral infections and silencing transposable genetic elements.
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the...
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the...
18.6K
Spreading of Chromatin Modifications
9.5K
The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
Writers
The writer...
Writers
The writer...
9.5K

