由TTN相关神经肌肉疾病中的拼接突变引起的异常mRNA处理
Guangyu Wang1, Wenjing Wu1, Xiaoqing Lv1
1Department of Neurology and Research Institute of Neuromuscular and Neurodegenerative Diseases, Qilu Hospital of Shandong University, Jinan, Shandong, 250012, China.
Journal of human genetics
|July 5, 2023
概括
两个新的TTN基因突变导致异常的mRNA拼接,导致罕见的神经肌肉疾病,如先天性肌肉病 (CM). 这扩大了 TTN 相关疾病的已知拼接突变谱.
科学领域:
- 遗传学 遗传学 是一个
- 分子生物学分子生物学
- 神经学 神经学
背景情况:
- TTN基因的突变与各种神经肌肉疾病有关,包括衰退的远端肌肉病和先天性肌肉病 (CM).
- 由TTN突变引起的异常mRNA拼接是一个已知的机制,但以前只发现了五种这样的拼接突变.
- 了解这些突变对于诊断和潜在治疗这些罕见疾病至关重要.
研究的目的:
- 调查两名患有TTN相关的自体逆向神经肌肉疾病的个体的临床,病理和遗传特征.
- 识别和描述TTN基因中导致异常mRNA拼接的新突变.
- 扩大对TTN基因与神经肌肉疾病相关联的拼接突变谱的理解.
主要方法:
- 对两个受影响个体进行临床检查和详细的表型鉴定.
- 肌肉病理学分析以评估组织变化.
- 基因分析,包括内基突变的鉴定.
- cDNA分析以证实已识别的突变对mRNA剪接的影响.
主要成果:
- 在TTN基因中发现了两种新的内突变:c.107377+1 G>C在内突362和c.19994-2 A>G在内突68.
- 这种c.107377+1 G>C突变导致了整个内子362.2的保留.
- c.19994-2 A>G 突变导致了exon 69最初的11个基对的跳过.
结论:
- 在TTN中发现的内基突变会导致特定的异常mRNA拼接事件.
- 这些发现扩大了TTN相关神经肌肉疾病中已知的拼接缺陷范围.
- 这项研究有助于更全面地了解TTN相关肌肉病变的遗传基础.
相关概念视频
Alternative RNA Splicing
21.4K
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...
21.4K
Nonsense-mediated mRNA Decay
10.7K
The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
10.7K
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
Nuclear Export of mRNA
7.7K
Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...
7.7K
Translation
15.0K
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 Life
Proteins are...
Translation Produces the Building Blocks of Life
Proteins are...
15.0K
Mutations
83.8K
Overview
83.8K


