Block Copolymer Nanoparticles for Large-Payload Gene Delivery
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Solution Overview
Problem
Current gene delivery systems, including AAVs and non-viral systems like liposomes, face challenges in delivering large genetic payloads, such as the CRISPR/Cas9 system, to specific tissues while avoiding immune responses and ensuring co-delivery of multiple molecules, and they are prone to degradation and poor biocompatibility.
Innovation Solution
Development of block copolymers that form polymer nanoparticles (PNPs) capable of complexing with nucleic acids, featuring specific molecular and structural properties to enhance stability and delivery efficiency, including a first block of poly dimethylaminoethyl methacrylate (DMAEMA) and a second block of alkylacrylate and acrylic acid copolymers, which self-assemble to form nanoparticles for targeted gene delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If AAVs are used for gene delivery, then delivery efficiency to specific tissues is improved, but the ability to deliver large genetic payloads such as CRISPR/Cas9 system is limited
Solution Approach 1:
The block copolymer is divided into distinct functional blocks: a cationic block (poly DMAEMA) for nucleic acid complexation, and a hydrophobic block (poly alkylacrylate-co-acrylic acid) for nanoparticle formation and stability. This segmentation allows each block to independently perform its specialized function, enabling the system to deliver large payloads while maintaining delivery efficiency.
Solution Approach 2:
The invention uses a composite block copolymer structure combining cationic and hydrophobic segments. The cationic poly DMAEMA block provides electrostatic complexation with negatively charged nucleic acids, while the hydrophobic poly alkylacrylate-co-acrylic acid block forms the nanoparticle core and provides structural stability. This composite material approach enables simultaneous achievement of high delivery efficiency and large payload capacity.
2Adaptability or versatility
If multiple large molecules are co-delivered for CRISPR/Cas9 system, then gene editing capability is improved, but delivery system complexity increases
Solution Approach 1:
The invention merges multiple delivery functions into a single block copolymer nanoparticle system. The cationic poly DMAEMA block simultaneously complexes multiple types of nucleic acids (Cas9 mRNA, sgRNA, and donor DNA template), while the hydrophobic block provides unified nanoparticle structure and stability. This merging eliminates the need for separate delivery systems for each component, reducing overall system complexity while maintaining the ability to deliver multiple large molecules for complete CRISPR/Cas9 functionality.
3Ease of manufacture
If non-viral gene delivery systems like liposomes are used, then ease of manufacture is improved, but biocompatibility and stability are worsened
Solution Approach 1:
The invention changes the chemical parameters of the delivery system by using synthetic block copolymers with specific properties: poly DMAEMA provides cationic charge for nucleic acid binding, while poly alkylacrylate-co-acrylic acid provides hydrophobicity for nanoparticle formation. By adjusting the molecular weight, block ratios, and composition of these polymers, the system achieves optimal biocompatibility and stability while remaining relatively simple to manufacture through conventional polymerization techniques.
4Ease of operation
If current non-viral delivery systems are used, then ease of operation is improved, but degradation by enzymes and inability to package multiple large payloads occurs
Solution Approach 1:
The block copolymer forms a flexible nanoparticle structure where the hydrophobic poly alkylacrylate-co-acrylic acid block creates a protective shell around the cationic poly DMAEMA block that complexes the nucleic acids. This flexible nanoparticle shell protects the encapsulated genetic materials from enzymatic degradation while allowing the system to maintain ease of operation through simple formulation and administration.
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 block copolymer nanoparticles effectively encapsulate and deliver genetic materials with high efficiency, maintaining particle size and enhancing transfection efficiency, thereby overcoming the limitations of existing delivery methods.
Implementation Method 1
block copolymers that form polymer nanoparticles (PNPs) capable of complexing with nucleic acids, featuring specific molecular and structural properties to enhance stability and delivery efficiency
Implementation Method 2
The block copolymer nanoparticles effectively encapsulate and deliver genetic materials with high efficiency
Data Source
AI summary
The disclosure relates to block copolymer nanoparticles for in vivo screening and for in vivo therapeutic delivery, and methods thereof. More particularly, the invention relates to polymer nanoparticles, such as reversible addition-fragmentation chain transfer (RAFT) polymer compositions, for delivering nucleotides.