相关实验视频
Updated: Jul 2, 2025

09:20
CRISPR-Mediated Reorganization of Chromatin Loop Structure
Published on: September 14, 2018
12.6K
通过与R循环的直接相互作用,LC3B驱动了与转录相关的同源重组
Junghyun Yoon1,2, Yiseul Hwang1,2, Hansol Yun1,2
1Department of Physiology, Ajou University School of Medicine, Suwon, Gyeonggi 16499, Republic of Korea.
Nucleic acids research
|February 27, 2024
概括
LC3B蛋白对于DNA修复至关重要,促进转录相关同源重组 (TA-HRR) 独立于自. 它与DNA病变和BRCA1相互作用,通过防止转移到易发生错误的途径来确保基因组稳定性.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 细胞生物学 细胞生物学
背景情况:
- 乌比奎丁类修饰剂 (ULM) 涉及到细胞应激反应.
- DNA损伤反应 (DDR) 涉及复杂的途径,以保持基因组完整性.
- 已知自和DNA修复途径相互作用,但仍在发现特定的分子联系.
研究的目的:
- 调查LC3B的作用,一个ULM,在DNA损伤反应.
- 阐明LC3B影响DNA修复途径的机制,特别是转录相关同源重组 (TA-HRR).
- 要确定LC3B在DNA修复中的功能是否依赖于自.
主要方法:
- 先进的DNA损伤和修复测试技术.
- 原生RNA免疫沉与高通量测序 (nRIP-seq) 相结合.
- LC3B 枯竭实验和染色体不稳定性标记的分析 (姐妹染色体交换,染色体间融合).
主要成果:
- LC3B的RNA识别动机 (RRM) 对于促进TA-HRR在DNA病变中的转录活性位点上至关重要,独立于自.
- LC3B直接与DNA损伤中的R环和BRCA1的3'UTR AU丰富元素 (ARE) 结合,影响其稳定性.
- LC3B的枯竭破坏了TA-HRR,导致对非同类末端结合 (NHEJ) 和染色体不稳定性的依赖增加.
结论:
- 在调节转录相关同源重组 (TA-HRR) 中,LC3B发挥着关键的,自独立的作用.
- LC3B与DNA病变和BRCA1的相互作用突出了其在DNA修复中的多方面的功能.
- 这些发现揭示了ULM,DNA修复和基因组稳定性之间的新联系,可能会影响我们对癌症生物学的理解.
相关概念视频
Homologous Recombination
50.5K
The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
50.5K
Conservative Site-specific Recombination and Phase Variation
6.0K
Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
The recognition sites for Cre recombinase called LoxP...
The recognition sites for Cre recombinase called LoxP...
6.0K
Crossing Over
4.4K
Crossing over is the exchange of genetic information between homologous chromosomes during prophase I of meiosis I. Genetic recombination gives rise to allelic diversity in the newly formed daughter cells. In humans, crossing over produces genetically distinct haploid egg and sperm cells that undergo fertilization to produce unique offspring. Before cell division starts, the germ cell’s chromosome(s) undergo duplication in the S phase of the cell cycle. As the cells enter prophase I,...
4.4K
Nucleotide Excision Repair
3.5K
DNA Distortion and Damage
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
3.5K
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
Restarting Stalled Replication Forks
5.8K
DNA replication is initiated at sites containing predefined DNA sequences known as origins of replication. DNA is unwound at these sites by the minichromosome maintenance (MCM) helicase and other factors such as Cdc45 and the associated GINS complex.The unwound single strands are protected by replication protein A (RPA) until DNA polymerase starts synthesizing DNA at the 5’ end of the strand in the same direction as the replication fork. To prevent the replication fork from falling apart,...
5.8K

