Pre-mRNA Branch Point Modification for Gene Silencing
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Solution Overview
Problem
Current gene silencing techniques, such as antisense oligodeoxyribonucleic acids (ODNs) and RNA interference (RNAi), face limitations including high concentration requirements, immune responses, unintended toxic side effects, and inefficacy in targeting pre-mRNA transcripts, particularly those with alternative splicing sites, which hinders their use in therapeutic applications.
Innovation Solution
A method involving a chimeric adenovirus plasmid that facilitates the identification and modification of the branch point in pre-mRNA transcripts, allowing for selective 2′-O-methylation to prevent splicing and translation, and the use of engineered snoRNAs to guide RNA modifications, enabling precise targeting of splicing sites and codon modifications to bypass nonsense mutations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If antisense ODNs are used for gene silencing, then gene expression can be repressed, but high concentrations are required which trigger immune responses and toxic side effects
Solution Approach 1:
The invention changes the chemical parameters of the oligonucleotide by using 2′-O-methyl RNA modifications instead of standard DNA or RNA sequences. This parameter change allows effective gene silencing at much lower concentrations, thereby reducing immune responses and toxic side effects while maintaining reliability
2Quantity of substance
If RNAi is used for gene silencing, then lower concentrations are required compared to ODNs, but it cannot target pre-mRNA transcripts and certain mRNA targets are refractory to silencing
Solution Approach 1:
The invention creates a universal modification system that can target both pre-mRNA and mature mRNA transcripts. By using 2′-O-methyl RNA modifications guided by engineered snoRNAs, the system achieves broad adaptability across different RNA targets while maintaining low concentration requirements, overcoming the limitations of RNAi
3Reliability
If high concentrations of ODNs are used to achieve effective gene silencing, then silencing efficacy is improved, but unintended toxic side effects and immune responses increase
Solution Approach 1:
The invention changes the chemical parameters of the oligonucleotide by using 2′-O-methyl RNA modifications instead of standard DNA or RNA sequences. This parameter change allows effective gene silencing at much lower concentrations, thereby reducing immune responses and toxic side effects while maintaining reliability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for efficient and specific silencing of genes, including alternatively spliced variants, and correction of nonsense mutations, reducing the risk of unintended consequences and improving therapeutic potential by enabling precise control over gene expression.
Implementation Method 1
The 2′-O-methylation of the pre-mRNA transcript is directed by the guide RNA sequence
Implementation Method 2
facilitates the identification and modification of the branch point in pre-mRNA transcripts
Implementation Method 3
the use of engineered snoRNAs to guide RNA modifications, enabling precise targeting of splicing sites and codon modifications to bypass nonsense mutations
Data Source
AI summary
Methods for affecting mRNA expression or translation through the modification of pre-mRNA or mRNA transcripts are described. In one embodiment of the methods of the present invention, the branch point adenosine of a pre-mRNA transcript is 2′-0-methylated to block splicing and subsequent expression of the protein encoded by the transcript. In another embodiment, a uridine residue in a nonsense stop codon may be modified to pseudouridine, causing the translation machinery to read through the nonsense stop codon and translate a full length protein.