拼接切换反意义的寡核化物 正确的氨酸氧化酶外子11跳过缺陷和救援酶活性在基尿症
Ainhoa Martínez-Pizarro1, Mar Álvarez1, Maja Dembic2
1Centro de Biología Molecular Severo Ochoa UAM-CSIC, IUBM, CIBERER, IdiPaz, Universidad Autónoma de Madrid, Madrid, Spain.
Nucleic acid therapeutics
|April 9, 2024
概括
我们开发了一种新的反感应策略,通过向氨酸氧化酶 (PAH) 基因的错误拼接来纠正氨酸尿症 (PKU). 这种方法对治疗各种PAH拼接缺陷充满希望.
科学领域:
- 遗传学和分子生物学
- 生物化学 生物化学
- 治疗开发的治疗方法
背景情况:
- 基尿症 (PKU) 是由于氨酸氧化酶 (PAH) 缺乏造成的,导致有毒氨酸的积累.
- 在PAH基因中发生的突变,特别是影响外核子11拼接,是PKU的重要原因.
- 结合U1snRNP与新型内核11元素对于正确的外核11定义至关重要.
研究的目的:
- 开发和验证针对11号内子的反意义策略,以纠正PAH错误拼接.
- 识别在PKU变体中恢复正确的前列子11拼接的拼接切换反感小核酸 (SSO).
主要方法:
- 实验室微基因试验被用于确定SSO,以纠正PAH变体中的外跳转.
- 创建了一个具有特定PAH变体 (c.1199+17G>A) 的CRISPR/Cas9生成的肝瘤细胞模型.
- 通过测量外形子11的含量,PAH蛋白水平和SSO转染后的酶活性来评估功能性救援.
主要成果:
- 确定的SSO有效地纠正了多个PAH变体的外跳转缺陷 (c.1199+17G>A,c.1199+20G>C,c.1144T>C,c.1066-3C>T).
- 肝瘤细胞模型准确地复制了患者的拼接缺陷,显示了减少的PAH蛋白和活性.
- 在细胞模型中,SSO治疗增加了外因子11的含量,并恢复了PAH功能.
结论:
- 一个针对 11 个内子序列的反意义策略可以有效地纠正 PAH 11 个外子跳转.
- 一个单一的SSO证明了解决导致PKU的多种异源和内源拼接变体的潜力.
- 这项研究为患有PAH拼接缺陷的PKU患者提供了潜在的治疗方法的概念证明.
相关概念视频
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
Inborn Errors of Metabolism
157
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...
157
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
141.9K
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...
141.9K
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
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


