Modified Antisense Oligonucleotides for Sub-Nuclear RNA Knockdown
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Solution Overview
Problem
Functionalizing individual non-coding RNAs (ncRNAs), particularly those localized to cellular sub-organelles like snoRNAs and scaRNAs, has been hindered by the lack of convenient knockout or knockdown approaches in mammals, limiting their biological study and therapeutic application.
Innovation Solution
The use of modified antisense compounds, specifically oligomeric compounds with a 5′-region, a 3′-region, and a central region comprising deoxyribonucleosides, which are complementary to target sub-nuclear RNAs, to reduce their activity without electroporation, thereby modulating their function and affecting RNA processing and cell viability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional antisense oligonucleotides are used to target sub-nuclear RNAs, then the approach is simple in concept, but the delivery efficiency is insufficient and electroporation is required which increases procedural complexity
Solution Approach 1:
The patent modifies the chemical parameters of the oligonucleotide by incorporating specific sugar modifications (2′-O-methoxyethyl, 2′-fluoro, bicyclic sugars) at terminal positions and phosphorothioate backbone modifications. These parameter changes enhance cellular uptake and stability, enabling effective delivery to sub-nuclear compartments without requiring electroporation, thus resolving the contradiction between operational simplicity and knockdown efficiency.
Solution Approach 2:
The invention creates a composite oligonucleotide structure combining multiple modified nucleoside types (2′-MOE, 2′-F, bicyclic sugars) with phosphorothioate linkages. This composite material approach integrates the benefits of different modifications: 2′-MOE for stability, 2′-F for affinity, and phosphorothioate for nuclease resistance, achieving reliable sub-nuclear RNA knockdown through enhanced delivery properties without electroporation.
2Stability of the object's composition
If chemically modified oligonucleotides are used to enhance affinity and resistance to degradation, then the stability and affinity improve, but the complexity of synthesis and modification increases
Solution Approach 1:
The oligonucleotide is segmented into distinct functional regions: a 5′ terminal region with specific modifications (1-3 modified nucleosides), a central region with standard or lightly modified nucleosides (7-15 nucleotides), and a 3′ terminal region with modifications (1-3 modified nucleosides). This segmentation allows concentrated stability enhancements at critical terminal positions while keeping the central region simpler, reducing overall synthesis complexity while maintaining high stability and affinity.
Solution Approach 2:
The patent applies modifications locally at specific positions rather than uniformly throughout the oligonucleotide. The 5′ and 3′ terminal nucleosides receive heavy modification (2′-MOE, 2′-F, bicyclic sugars) where they are most needed for stability and cellular uptake, while internal positions use simpler modifications or none at all. This local quality approach maximizes stability benefits while minimizing synthesis complexity.
3Adaptability or versatility
If standard oligonucleotides are used to target ncRNAs, then the sequence is simple, but the ability to reach sub-nuclear compartments and achieve functional knockdown is insufficient
Solution Approach 1:
The patent changes key parameters of the oligonucleotide including: (1) sugar modifications (2′-O-methoxyethyl, 2′-fluoro, bicyclic sugars) to enhance cellular uptake and sub-nuclear localization; (2) phosphorothioate backbone modifications to improve stability and reduce degradation; (3) specific length parameters (18-30 nucleotides) optimized for sub-nuclear RNA targeting. These parameter changes enable effective sub-nuclear compartment targeting with lower doses, resolving the contradiction between adaptability and quantity required.
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 effectively reduces the activity of target sub-nuclear RNAs, leading to changes in RNA processing, such as methylation of ribosomal RNA, and can impact cell viability and cell cycling, particularly in cancer cells, providing a method for functionalizing these RNAs and developing therapeutic compositions.
Implementation Method 1
contacting the cell with a modified antisense compound complementary to the target sub-nuclear RNA
Data Source
AI summary
The present invention provides compounds and methods for modulating target nucleic acids found in organelles or sub-organelles of cells. The invention includes, but is not limited to compounds and methods that modulate target nucleic acids in a sub-nuclear organelle, such as the nucleolus and/or a cajal body. In certain embodiments, the cell is in an animal.