Modified saRNA Molecule Design for Gene Expression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current RNAa therapies face limitations in effectively increasing gene expression while minimizing off-target effects, as traditional small activating RNAs (saRNAs) often result in suboptimal expression levels and significant background activity.
Innovation Solution
Modified saRNAs with mismatches at the 5' terminus of the antisense strand and/or blocking moieties at the 5' terminus of the sense strand are introduced, enhancing gene expression and reducing off-target effects by promoting the use of the antisense strand over the sense strand within the RNAi machinery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional small activating RNAs (saRNAs) are used to increase gene expression, then gene expression is activated, but off-target effects increase and expression levels become suboptimal
Solution Approach 1:
The patent applies local quality by introducing specific modifications at the 5' terminus regions of the saRNA strands. The antisense strand receives a mismatch at its 5' terminus, while the sense strand receives a blocking moiety at its 5' terminus. These localized modifications create asymmetric properties at specific positions without altering the overall saRNA structure, thereby enhancing target gene activation while reducing off-target effects through differentiated local characteristics.
Solution Approach 2:
The patent implements asymmetry by treating the sense and antisense strands differently at their 5' termini. The antisense strand is modified with a mismatch at its 5' terminus to promote loading into the RNA-induced transcriptional activation (RITA) complex, while the sense strand is modified with a blocking moiety at its 5' terminus to prevent unwanted interactions. This asymmetric modification strategy optimizes the functional balance between the two strands, improving gene activation efficiency while minimizing off-target effects.
2Object-affected harmful factors
If saRNA modifications are introduced to reduce off-target effects, then off-target effects decrease, but gene expression activation may be reduced
Solution Approach 1:
The patent applies parameter changes by modifying specific parameters of the saRNA structure: introducing a mismatch at the 5' terminus of the antisense strand and adding a blocking moiety at the 5' terminus of the sense strand. These parameter modifications alter the physical and chemical properties of the saRNA molecules, enabling them to differentiate between target and off-target sequences while maintaining their ability to activate gene expression through the RNA-induced transcriptional activation (RITA) pathway.
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
The modified saRNAs demonstrate a significant increase in gene expression, achieving up to 400% of the control saRNA's ability, while minimizing off-target effects, thereby providing a more targeted and efficient therapeutic approach.
Implementation Method 1
RNA interference (RNAi) is an evolutionally conserved mechanism of gene regulation by which small double-stranded RNA (dsRNA) molecules inhibit translation or degrade complementary mRNA sequences
Implementation Method 2
short dsRNAs have also been shown to induce gene expression in a phenomenon referred to as RNA activation (RNAa)
Data Source
AI summary
Methods, compositions and kits are provided for increasing the expression of a gene product in a cell by contacting the cell with a modified small activating RNA (saRNA) molecule, which provides for an increase in gene expression that is improved over the increase in expression provided by traditional saRNAs. These methods and compositions find use in any application in which an increase in gene expression in a cell is desired.