替代拼接调节了RIF1 C终端域的染色体相互作用和相分离
Adenine Si-Hui Koo1, Weiyan Jia1, Sang Hwa Kim1
1Department of Human Oncology, University of Wisconsin School of Medicine and Public Health, 1111 Highland Ave, Madison, WI 53705, USA.
bioRxiv : the preprint server for biology
|November 18, 2024
概括
RIF1 (RAP1相互作用因子) 的替代拼接会产生不同的变体,影响DNA修复和基因组组织. 细胞周期,DNA损伤和特定的剪接因子调节了exon 32的包含,影响了RIF1的功能.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 遗传学 是一个遗传学.
背景情况:
- RIF1 (RAP1相互作用因子) 对于DNA修复,复制和核组织至关重要.
- 由于Exon 32 (Ex32) 的替代拼接,RIF1存在两个拼接变体,RIF1-Long (RIF1-L) 和RIF1-Short (RIF1-S),这是由于Exon 32 (Ex32) 的替代拼接.
- Ex32编码在RIF1 C终端域中的,可能调节蛋白质功能.
研究的目的:
- 调查RIF1.1.中的Ex32替代拼接规则.
- 描述RIF1-L和RIF1-S异型之间的功能差异.
- 了解替代拼接如何影响RIF1在基因组保护中的作用.
主要方法:
- 在各种条件下 (DNA损伤,细胞循环) 分析Ex32含量水平.
- 确定调节Ex32拼接的拼接因子 (例如,SRSF1,PTBP1,SRSF3).
- 异形特异性蛋白质组学和生物化学试验,以比较RIF1-L和RIF1-S.
主要成果:
- 通过DNA损伤和瘤发生抑制了Ex32的纳入,在G2/M阶段达到峰值.
- 拼接因子SRSF1,PTBP1和SRSF3直接调节Ex32的拼接.
- RIF1-L显示了与MDC1的增强关联,并加强了它对DNA损伤部位的招募.
- RIF1异型表现出明显的相分离和由CDK1酸化调节的染色素结合特性.
结论:
- 调节RIF1RIF1的替代拼接Exon 32微调RIF1的功能,以响应细胞线索.
- RIF1-L和RIF1-S异型具有影响DNA修复和基因组组织的独特特性.
- 替代拼接是控制RIF1在维护基因组完整性的多方面的作用的关键机制.
相关概念视频
Chromatin Structure Regulates pre-mRNA Processing
6.9K
In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
The chromatin structure, especially...
The chromatin structure, especially...
6.9K
Alternative RNA Splicing
21.0K
Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
21.0K
RNA Splicing
56.0K
Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...
56.0K
Chromatin Structure and RNA Splicing
2.7K
2.7K
Pre-mRNA Processing: RNA Splicing
5.2K
5.2K
Conservative Site-specific Recombination and Phase Variation
5.9K
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...
5.9K


