一种Drosophila的序列依赖性是一个上下文依赖的转录因子
Lauren J Hodkinson1, Julia Gross2, Casey A Schmidt3
1Genetics and Molecular Biology Graduate Program, Emory University, Atlanta, GA 30322 USA.
bioRxiv : the preprint server for biology
|December 18, 2023
概括
像CLAMP这样的转录因子可以根据它们的位置执行不同的功能. CLAMP使用DNA序列和局部基因组环境来进行特定环境的基因调节.
科学领域:
- 遗传学和基因组学 遗传学和基因组学
- 分子生物学分子生物学
- 基因调节 基因调节
背景情况:
- 单个转录因子可以在不同的基因组位置表现出上下文依赖的功能.
- 了解转录因子如何整合cis序列和基因组语境至关重要,特别是在基因工程应用中.
- 草的转录因子CLAMP在X染色体和基因基因位点结合了类似的cis元素,但招募了不同的辅助因子.
研究的目的:
- 为了研究如何Drosophila转录因子CLAMP实现上下文特定的功能,尽管结合类似的cis元素.
- 阐明CLAMP将cis序列信息与本地基因组背景集成的机制.
- 了解基因编辑技术对非目标效应的影响.
主要方法:
- 对CLAMP结合部位的比较分析.
- 通过CLAMP招募的特定位置因子的识别.
- 研究局部序列和基因组背景在CLAMP功能中的作用.
主要成果:
- 为了确定其功能,CLAMP使用cis元素序列和局部基因组环境.
- 不同的位置招募不同的,CLAMP特定的因素.
- CLAMP的特定环境活动受到蛋白质-蛋白质相互作用和辅因子存在的影响.
结论:
- 转录因子的基因调节高度依赖于基因组背景.
- CLAMP的功能特异性来自于将cis元素识别与本地基因组线索相结合.
- 对这些机制的进一步研究对于理解基因调节和提高基因工程精度至关重要.
相关概念视频
Cis-regulatory Sequences
9.9K
Cis-regulatory sequences are short fragments of non-coding DNA that are present on the same chromosomes as the genes that they regulate. These fragments serve as binding sites for transcriptional regulators, proteins that are responsible for controlling gene transcription and differential gene expression across cell types in eukaryotes. Cis-regulatory sequences can be close to the gene of interest or thousands of bases away in the DNA sequence; however, those sequences that are further away are...
9.9K
Exon Recombination
3.6K
The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes.
Exon shuffling follows “splice frame rules.” Each exon...
Exon shuffling follows “splice frame rules.” Each exon...
3.6K
Cooperative Binding of Transcription Regulators
6.4K
Transcriptional regulators bind to specific cis-regulatory sequences in the DNA to regulate gene transcription. These cis-regulatory sequences are very short, usually less than ten nucleotide pairs in length. The short length means that there is a high probability of the exact same sequence randomly occurring throughout the genome. Since regulators can also bind to groups of similar sequences, this further increases the chances of random binding. Transcriptional regulators form...
6.4K
Position-effect Variegation
6.3K
In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
6.3K
Combinatorial Gene Control
8.4K
Combinatorial gene control is the synergistic action of several transcriptional factors to regulate the expression of a single gene. The absence of one or more of these factors may lead to a significant difference in the level of gene expression or repression.
The expression of more than 30,000 genes is controlled by approximately 2000-3000 transcription factors. This is possible because a single transcription factor can recognize more than one regulatory sequence. The specificity in gene...
The expression of more than 30,000 genes is controlled by approximately 2000-3000 transcription factors. This is possible because a single transcription factor can recognize more than one regulatory sequence. The specificity in gene...
8.4K
RNA Polymerase II Accessory Proteins
9.2K
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...
9.2K


