BCL-x的替代拼接是由RBM25与BCL-x前mRNA中的G-四重复合体结合控制的
Ronan Le Sénéchal1, Marc Keruzoré1, Alicia Quillévéré1
1Univ Brest; Inserm UMR1078; Etablissement Français du Sang (EFS) Bretagne; CHRU Brest, Hôpital Morvan, Laboratoire de Génétique Moléculaire, 22 avenue Camille Desmoulins, F-29200 Brest, France.
Nucleic acids research
|October 9, 2023
概括
研究人员发现,拼接因子RBM25与BCL-x前mRNA中的特定RNA结构 (rG4) 结合. 这种相互作用促进了亲细胞亡的Bcl-xS异型的产生,为癌细胞重新敏感化疗提供了一个新的策略.
科学领域:
- 分子生物学分子生物学
- 在RNA分离过程中.
- 癌症治疗方法 癌症治疗方法
背景情况:
- 在BCL-x前mRNA的替代拼接过程中产生了抗亡的 (Bcl-xL) 和亲亡的 (Bcl-xS) 异型.
- Bcl-x异型的失调与癌症化学抵抗,糖尿病和心脏疾病有关.
- 拼接因子RBM25调节BCL-x的替代拼接,在过度表达时有利于Bcl-xS的产生.
研究的目的:
- 阐明RBM25控制BCL-x替代拼接的机制.
- 确定特定的RNA结构和参与RBM25介导拼接的蛋白质域.
- 探索针对癌症治疗RBM25/BCL-x相互作用的治疗策略.
主要方法:
- RNA结合测试以确认RBM25与BCL-x前mRNA的相互作用.
- 在BCL-x前mRNA中识别RNAG-四重复 (rG4) 结构.
- 对RBM25进行突变分析,以确定关键的功能域 (例如RE动机).
- 对小分子 (G4配体) 对它们对RBM25结合和拼接结果的影响进行选.
主要成果:
- RBM25直接与BCL-x前mRNA中的GQ-2rG4结构结合,该结构位于替代5'拼接位附近.
- 这种RBM25/rG4相互作用对于促进产生亲细胞灭绝性Bcl-xS异型的促进至关重要.
- 对于这种rG4相互作用来说,RBM25的富含氨酸氨酸 (RE) 基因是至关重要的.
- 包括PhenDC3,PhenDH8和PhenDH9在内的G4配体增强RBM25与GQ-2的结合,促进Bcl-xS和亡.
结论:
- RBM25/GQ-2 rG4相互作用代表了一种控制BCL-x替代拼接的新机制.
- 针对这种与小分子的相互作用提供了一个有希望的策略,以诱导癌细胞的亡.
- 这种方法可能会使化学抵抗性瘤对治疗干预重新敏感.
相关概念视频
RNA Splicing
56.5K
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...
56.5K
Alternative RNA Splicing
21.2K
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...
21.2K
Chromatin Structure Regulates pre-mRNA Processing
7.0K
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...
7.0K
Leaky Scanning
5.2K
During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA. Marilyn Kozak discovered that the sequence RCCAUGG (where R...
5.2K
Pre-mRNA Processing: RNA Splicing
5.3K
5.3K
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


