脊椎肌肉缩I型与新型SMN1拼接变体相关,该变体破坏了功能转录的表达
Christina Votsi1, Pantelitsa Koutsou1, Antonis Ververis1
1Neurogenetics Department, The Cyprus Institute of Neurology and Genetics, Nicosia, Cyprus.
Frontiers in neurology
|October 6, 2023
概括
这项研究确定了一种新的SMN1基因变异,导致婴儿脊髓肌缩 (SMA). 这一发现扩大了已知的SMA引起的遗传改变的范围.
科学领域:
- 遗传学 是一个遗传学.
- 分子生物学分子生物学
- 神经学 神经学
背景情况:
- 脊椎肌肉缩 (SMA) 是一种遗传的神经肌肉疾病.
- 由SMN1基因中的致病变体引起的.
- 大多数SMA病例都涉及到SMN1第7个表因子的同卵性缺失;非缺失变异更罕见,更难以检测.
研究的目的:
- 在患有严重SMA的婴儿中报告一种新的SMN1拼接变异.
- 描述这种变异的遗传和分子后果.
- 有助于理解SMA引起变异的频谱.
主要方法:
- 对于SMN1/2外子剂量的多重结合依赖探头放大 (MLPA).
- 桑格测序和远程PCR用于变种识别.
- 实时PCR用于定性和定量SMN1/2RNA分析.
主要成果:
- 一种新的SMN1拼接位变体 (c.835-8_835-5delinsG) 在化合物异构性中被发现,具有SMN1外因子7/8的删除.
- RNA分析证实,该变种破坏了SMN1的拼接,导致功能性SMN1外子7的缺失.
- 没有检测到功能性SMN1-FL转录,但观察到SMN1-d7和增加的SMN2转录.
结论:
- 已识别的非删除SMN1变异是致病的,扩大了已知的SMA遗传变化的谱.
- 这一案例凸显了检测非删除SMN1变体的重要性.
- 塞浦路斯最新的SMA遗传发现显示,内基因变异的百分比更高.
更多相关视频
06:51Systemic Delivery of MicroRNA Using Recombinant Adeno-associated Virus Serotype 9 to Treat Neuromuscular Diseases in Rodents
Published on: August 10, 2018
7.7K
05:16Characterizing Exon Skipping Efficiency in DMD Patient Samples in Clinical Trials of Antisense Oligonucleotides
Published on: May 7, 2020
6.9K
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
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
Translation
142.1K
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...
142.1K
Satellite Stem Cells and Muscular Dystrophy
2.0K
Satellite stem cells or myosatellite cells are quiescent stem cells that Alexander Mauro first identified in 1961. These cells are located between the sarcolemma, the plasma membrane of muscle fibers, and the basal lamina, the connective tissue sheath covering it. These mononucleated cells are activated in response to muscle injury, can transform into myoblasts, and may form or repair muscle fibers. Myosatellite cells can provide additional myonuclei for muscle regeneration or return to a...
2.0K
Mutations
83.4K
Overview
83.4K
