导致过早终结子的突变会歧视并产生HHT的细胞和临床变异性.
Maria E Bernabéu-Herrero1,2, Dilipkumar Patel1,2, Adrianna Bielowka1,2
1National Heart and Lung Institute, Imperial College London, London, United Kingdom.
Blood
|March 8, 2024
概括
在遗传性出血端膜病 (HHT) 中,过早终止子 (PTC) 解释出血变异性. 在受压力的细胞中,PTC转录水平上升,这表明HHT的新治疗点.
科学领域:
- 遗传学和分子生物学
- 细胞生物学 细胞生物学
- 疾病机制 疾病机制
背景情况:
- 单一性疾病通常通过在因果基因内分组分子亚型来研究.
- 在遗传性出血性远程切除症 (HHT) 中的表型变异性仍然不完全理解.
- 无意中介衰变 (NMD) 的目标是含有转录的过早终止子 (PTC).
研究的目的:
- 研究PTCs在HHT表型变异性中的作用.
- 在NG,ACVRL1和SMAD4中对导致HHT的变异进行分类,基于PTC生成.
- 探索HHT中PTC持久性的细胞后果.
主要方法:
- 分析了三个患有PTC生成变异的患者队列.
- 来自HHT患者的血液外生长内皮细胞 (BOEC) 的培养.
- RNA转录分析,基因表达造型,脉冲追踪实验和无监督的等级聚类.
- 该系统用于评估ATF4诱导和AlphaFold/AlphaMissense用于蛋白质建模.
主要成果:
- 一个基于PTC的分类系统部分解释了HHT出血变异性.
- 含有PTC的转录的低水平 (8-23%) 在HHT BOEC中持续存在.
- 聚合到通用蛋白质术语的HHT BOEC中的差异性基因表达;观察到微妙的蛋白质成熟差异,但没有截断的蛋白质.
- 具有较高PTC持久性的BOEC显示出与增加的细胞应激相一致的模式.
- ENG Q436X变种,但不是 ENG R93X,直接诱导ATF4,一个适应应力基因调节器.
- AlphaMissense根据具体的变种预测了读透替代物的不同致病性.
结论:
- PTC 代表了一种独特的功能丧失变体类别,应该加以区分.
- 在细胞应激条件下,PTC转录水平可能会增加.
- 涉及读透蛋白和应激反应的机制为HTH研究提供了有前途的途径.
相关概念视频
Translation
142.0K
Lesson: Translation
Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
Translation Produces the Building Blocks of...
Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
Translation Produces the Building Blocks of...
142.0K
Mutations
82.2K
Overview
82.2K
Alternative RNA Splicing
21.1K
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...
21.1K
Genome Copying Errors
4.2K
DNA replication is a well-evolved process that copies millions of base pairs with high fidelity during each cell division. Occasionally a wrong base or a long stretch of wrong bases may get added to the daughter strands. If the errors are left unchecked, cells might accumulate several mutations that might endanger their survival. Therefore, the copying errors are checked and repaired at three levels.
4.2K
Mismatch Repair
4.8K
Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
4.8K
RNA Splicing
56.3K
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...
56.3K


