一种工程化的谷氨酸tRNA,用于有效抑制致病性无意义突变
Caitlin Specht1, Alejandro Tapia2, Sarah Penrod3
1Department of Biochemistry and Molecular Biology, Indiana University School of Medicine, Indianapolis, IN 46202, United States.
Nucleic acids research
|June 20, 2025
概括
工程抑制转移RNAs (sup-tRNAs) 可以治疗由无意义突变引起的遗传疾病. 一种新的sup-tRNA,tRNAGluV13,有效地抑制了谷氨酸位点的过早终止子,恢复了蛋白质合成.
科学领域:
- 遗传学 是一个遗传学.
- 分子生物学分子生物学
- 生物化学 生化学
背景情况:
- 导致过早终止子 (PTCs) 的无意义突变导致遗传疾病.
- 目前对这些疾病的治疗方法有限.
- 工程抑制转移RNAs (sup-tRNAs) 提供了一个潜在的治疗策略,通过启用停止子读透.
研究的目的:
- 开发一种有效的sup-tRNA来抑制PTCs在一种常见的突变部位 - - 谷氨酸密码子.
- 证明合理设计的sup-tRNA (tRNAGluV13) 能够恢复全长蛋白质合成的能力.
主要方法:
- 一个新型的sup-tRNA (tRNAGluV13) 的理性设计,准谷氨酸编码子.
- 测试tRNAGluV13在恢复PTCs的记者基因中的蛋白质合成中的效率.
- 在遗传性乳腺和卵巢癌综合征和囊性纤维化病的临床前模型中评估tRNAGluV13.
主要成果:
- tRNAGluV13在抑制谷氨酸密码子中的PTCs方面表现出高效率.
- 在记者基因试验中,sup-tRNA成功地恢复了全长蛋白质合成.
- 在遗传疾病模型中,tRNAGluV13显示了致病性PTCs的功能性救援.
结论:
- 开发的tRNAGluV13显著改善了在谷氨酸密码子的PTC抑制.
- 这一进步有望扩大对一系列遗传疾病的基于sup-tRNA的治疗方法.
- tRNAGluV13代表了治疗常见无意义突变引起的疾病的有希望的候选人.
相关概念视频
02:27Nonsense-mediated mRNA Decay
10.9K
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,...
10.9K
02:31Nuclear Export of mRNA
7.9K
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...
7.9K
01:39Mutations
84.6K
Overview
84.6K
02:23RNA Editing
9.2K
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...
9.2K
02:28Leaky Scanning
5.2K
During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA. Marilyn Kozak discovered that the sequence RCCAUGG (where R...
5.2K
02:26tRNA Activation
20.1K
Aminoacyl-tRNA synthetases are present in both eukaryotes and bacteria. Though eukaryotes have 20 different aminoacyl-tRNA synthetases to couple to 20 amino acids, many bacteria do not have genes for all of these aminoacyl-tRNA synthetases. Despite this, they still use all 20 amino acids to synthesize their proteins. For instance, some bacteria do not have the gene encoding the enzyme that couples glutamine with its partner tRNA. In these organisms, one enzyme adds glutamic acid to all of the...
20.1K