Modified dsRNA Motifs for Stronger Target Gene Silencing
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Solution Overview
Problem
There is a need for effective nucleotide or chemical motifs for dsRNA molecules that can efficiently inhibit target gene expression for therapeutic use.
Innovation Solution
The development of dsRNA molecules with specific motifs, including a sense and antisense strand of 15 to 35 nucleotides, featuring phosphorothioate internucleotide linkages, 2′-deoxy modifications, and a double-stranded region of 19 to 25 base pairs, which can inhibit target gene expression through RNA interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional dsRNA molecules are used, then gene expression inhibition can be achieved, but the efficacy is insufficient for therapeutic use
Solution Approach 1:
The patent modifies multiple parameters of the dsRNA molecule including nucleotide sequence composition, strand length (15-35 nucleotides), chemical modifications (phosphorothioate linkages, 2'-deoxy modifications), and secondary structure (duplex region of 19-25 base pairs). These parameter changes optimize the dsRNA for enhanced gene expression inhibition efficacy and therapeutic effectiveness.
Solution Approach 2:
The patent creates a composite dsRNA molecule combining different nucleotide types (sense and antisense strands), chemical linkages (phosphorothioate), and structural motifs (duplex region). This composite structure integrates multiple functional elements to achieve superior gene silencing activity compared to conventional dsRNA.
2Reliability
If dsRNA molecules with specific modifications are designed, then inhibition efficacy is improved, but molecular complexity increases
Solution Approach 1:
The patent applies specific chemical modifications at localized positions within the dsRNA molecule rather than uniformly throughout. Phosphorothioate linkages are placed at specific internucleotide positions, and 2'-deoxy modifications are positioned at specific nucleotide locations, creating local areas of enhanced functionality while maintaining overall molecular manageability.
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 dsRNA molecules effectively inhibit target gene expression, demonstrating efficacy in both in vitro and in vivo applications, including in mice and non-human primates.
Implementation Method 1
RNA interference or 'RNAi' is a term initially coined by Fire and co-workers to describe the observation that double-stranded RNAi (dsRNA) can block gene expression
Implementation Method 2
RISC is known to contain short RNAs (approximately 22 nucleotides) derived from the double-stranded RNA trigger
Data Source
AI summary
One aspect of the present invention relates to double-stranded RNA (dsRNA) agent capable of inhibiting the expression of a target gene. Other aspects of the invention relate to pharmaceutical compositions comprising these dsRNA molecules suitable for therapeutic use, and methods of inhibiting the expression of a target gene by administering these dsRNA molecules, e.g., for the treatment of various disease conditions.