Related Experiment Video
Updated: Nov 18, 2025
In Vitro Selection of Engineered Transcriptional Repressors for Targeted Epigenetic Silencing
Published on: May 5, 2023
Therapeutic promise of engineered nonsense suppressor tRNAs
Joseph J Porter1, Christina S Heil1, John D Lueck1,2
1Department of Pharmacology and Physiology, University of Rochester Medical Center, Rochester, New York, USA.
Abstract:
Nonsense mutations change an amino acid codon to a premature termination codon (PTC) generally through a single-nucleotide substitution. The generation of a PTC results in a defective truncated protein and often in severe forms of disease. Because of the exceedingly high prevalence of nonsense-associated diseases and a unifying mechanism, there has been a concerted effort to identify PTC therapeutics. Most clinical trials for PTC therapeutics have been conducted with small molecules that promote PTC read through and incorporation of a near-cognate amino acid. However, there is a need for PTC suppression agents that recode PTCs with the correct amino acid while being applicable to PTC mutations in many different genomic landscapes. With these characteristics, a single therapeutic will be able to treat several disease-causing PTCs. In this review, we will focus on the use of nonsense suppression technologies, in particular, suppressor tRNAs (sup-tRNAs), as possible therapeutics for correcting PTCs. Sup-tRNAs have many attractive qualities as possible therapeutic agents although there are knowledge gaps on their function in mammalian cells and technical hurdles that need to be overcome before their promise is realized. This article is categorized under: RNA Processing > tRNA Processing Translation > Translation Regulation.
Insights
Nonsense mutations cause disease by creating premature termination codons (PTCs). Suppressor tRNAs (sup-tRNAs) offer a promising therapeutic strategy to correct these mutations by recoding PTCs with the correct amino acid.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- Nonsense mutations, often caused by single-nucleotide substitutions, lead to premature termination codons (PTCs).
- PTCs result in truncated, non-functional proteins, frequently causing severe genetic diseases.
- The high prevalence of nonsense-associated diseases necessitates the development of effective therapeutics.
Purpose of the Study:
- To review nonsense suppression technologies, focusing on suppressor tRNAs (sup-tRNAs), as potential therapeutics for PTCs.
- To highlight the need for PTC therapeutics that can correct mutations across diverse genomic contexts.
- To discuss the advantages and challenges of using sup-tRNAs for treating PTC-related disorders.
Main Methods:
- Review of existing literature on nonsense mutations and PTC therapeutics.
- Focus on suppressor tRNA (sup-tRNA) technology for nonsense suppression.
- Discussion of challenges and knowledge gaps regarding sup-tRNA function in mammalian cells.
Main Results:
- Small molecules promoting read-through are common PTC therapeutics but have limitations.
- Suppressor tRNAs (sup-tRNAs) show potential for recoding PTCs with the correct amino acid.
- A single therapeutic agent capable of treating multiple PTCs is a significant goal.
Conclusions:
- Sup-tRNAs possess attractive qualities as therapeutic agents for nonsense-associated diseases.
- Further research is needed to address knowledge gaps in sup-tRNA function in mammalian systems.
- Overcoming technical hurdles is crucial for realizing the therapeutic potential of sup-tRNAs.
More Related Videos
Related Concept Videos
02:27Nonsense-mediated mRNA Decay
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
02:27Nonsense-mediated mRNA Decay
02:30siRNA - Small Interfering RNAs
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the...
01:23Types of RNA
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA...
01:20Types of RNA
RNA Performs Diverse...
02:15Experimental RNAi