在U2 snRNA基因RNU2-2P的突变导致严重的神经发育障碍与突出的
medRxiv : the preprint server for health sciences
|September 16, 2024
概括
编码U2小核RNA的RNU2-2P基因的突变导致神经发育障碍. 这一发现突显了结合体snRNAs在大脑发育和疾病中的作用.
科学领域:
- 遗传学 是一个遗传学.
- 分子生物学分子生物学
- 神经科学是一个神经科学.
背景情况:
- 主要拼接体对细胞功能至关重要,由U1,U2,U4,U5和U6 snRNAs组成.
- RNU4-2 (U4 snRNA) 的突变与普遍存在的单一性神经发育障碍有关.
- 许多神经发育障碍的遗传基础仍然不完全理解.
研究的目的:
- 确定与先前识别的U4 snRNA突变相关的神经发育障碍的遗传原因.
- 研究U2 snRNA基因突变在神经发育障碍中的作用.
主要方法:
- 对受影响个体进行了遗传关联研究.
- 在RNU2-2P中发现并分析了反复出现的de novo单核酸突变.
- 受影响个体的临床表型被系统地记录下来.
主要成果:
- 编码U2 snRNA的RNU2-2P中经常发生的生殖基因突变被确定为导致一种新的神经发育障碍.
- 在RNU2-2P.中确定了15例在特定部位 (核酸位4和35) 的新突变.
- 这种疾病表现为智力障碍,神经发育迟缓,自闭症行为,小头症,低血压,和严重的高通风,具有复杂的发作表型.
结论:
- 在RNU2-2P的生殖基因突变是导致一种独特的神经发育障碍的原因.
- 这项研究加强了主要结合体snRNA在神经发育障碍病因学中的关键作用.
- 这些发现扩大了影响大脑发育的结合体相关遗传疾病的范围.
相关概念视频
RNA Editing
8.9K
RNA editing is a post-transcriptional modification where a precursor mRNA (pre-mRNA) nucleotide sequence is changed by base insertion, deletion, or modification. The extent of RNA editing varies from a few hundred bases, in mitochondrial DNA of trypanosomes, to a just single base, in nuclear genes of mammals. Even a single base change in the pre-mRNA can convert a codon for one amino acid into the codon for another amino acid or a stop codon. This type of re-coding can significantly affect the...
8.9K
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
Nonsense-mediated mRNA Decay
10.6K
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,...
10.6K
Translation
14.7K
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...
14.7K
RNA Splicing
56.2K
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...
56.2K
Inborn Errors of Metabolism
146
Phenylketonuria (PKU) is a protein metabolism disorder characterized by high blood levels of the amino acid phenylalanine. This results from a mutation in the gene responsible for phenylalanine hydroxylase, an enzyme that converts phenylalanine into tyrosine. When this enzyme is deficient, phenylalanine builds up in the blood, leading to symptoms such as vomiting, rashes, seizures, growth deficiency, and severe mental retardation. An early diagnosis and a diet restricting phenylalanine intake...
146


