Bottlebrush Polymer Carriers for Scalable CRISPR Delivery
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Solution Overview
Problem
Current viral vector-based delivery systems for CRISPR therapeutics face challenges such as high costs, lengthy manufacturing times, regulatory hurdles, limited cargo capacity, and safety concerns like carcinogenic mutations and systemic inflammatory responses, necessitating the development of synthetic polymer-based alternatives for efficient and scalable gene delivery.
Innovation Solution
Development of polymeric delivery systems, including polymers of formula (I) and (III), which form complexes with biological agents like nucleic acids and proteins, offering scalable, biocompatible, and low-immunogenic options for intracellular delivery, enhancing transfection efficiency and minimizing toxicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If viral vectors are used to deliver CRISPR payloads, then delivery efficiency is improved, but manufacturing cost and time increase significantly
Solution Approach 1:
The patent replaces expensive, complex viral vectors with inexpensive synthetic polymer carriers that can be manufactured at scale without the regulatory and logistical bottlenecks of viral production. The bottlebrush polymers are designed as single-use delivery vehicles that can be produced cheaply and discarded after delivery, eliminating the need for costly viral vector manufacturing while maintaining delivery functionality.
Solution Approach 2:
The patent modifies the chemical parameters of the polymer carriers by adjusting the side chain length (n), backbone length (m), and substituent groups (W, X, Y, Z, Q1, Q2) to optimize delivery efficiency. By systematically varying these parameters, the invention achieves high delivery performance with synthetic polymers, matching or exceeding viral vector efficiency while avoiding their manufacturing limitations.
2Reliability
If viral vectors are used for gene delivery, then transfection efficiency is improved, but cargo capacity is limited
Solution Approach 1:
The patent achieves high cargo capacity by optimizing the polymer's molecular weight, side chain length, and charge density parameters. The bottlebrush architecture with adjustable n and m values allows the carrier to accommodate large CRISPR payloads including Cas9 protein, gRNA, and donor DNA templates, exceeding the cargo capacity of viral vectors while maintaining transfection efficiency through electrostatic complexation.
3Reliability
If viral vectors are used for therapeutic delivery, then gene delivery capability is achieved, but safety risks increase due to carcinogenic mutations and inflammatory responses
Solution Approach 1:
The patent uses non-integrating synthetic polymer carriers that deliver their cargo and are then cleared from the body without integrating into the genome, eliminating the risk of carcinogenic mutations. The disposable nature of these carriers ensures they perform their delivery function and are discarded safely, avoiding the persistent safety concerns associated with viral vector integration.
Solution Approach 2:
The patent optimizes the polymer's biocompatibility parameters by selecting biodegradable side chains and adjusting the charge density to reduce cytotoxicity. The bottlebrush architecture with specific end groups (Q1, Q2) and hydrophilic substituents (W, X, Y, Z) minimizes immune activation and inflammatory responses while maintaining effective gene delivery capability.
4Productivity
If polymeric delivery systems are used, then manufacturing cost is reduced and scalability is improved, but delivery efficiency decreases compared to viral vectors
Solution Approach 1:
The patent creates composite bottlebrush polymer structures combining hydrophobic backbones with hydrophilic side chains, cationic and anionic groups, and functional end groups. This composite architecture enables the polymer to form stable complexes with CRISPR payloads while facilitating cellular uptake and endosomal escape, achieving high delivery efficiency that matches viral vectors despite the advantages of synthetic polymer manufacturing.
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 polymeric delivery systems provide efficient intracellular delivery of CRISPR payloads, overcoming limitations of viral vectors by ensuring safety, scalability, and cost-effectiveness while reducing immune activation and cellular toxicity.
Implementation Method 1
In aqueous physiological solutions, cationic polymers can spontaneously bind with negatively charged pDNA and form interpolyelectrolyte complexes
Data Source
AI summary
This invention relates generally to Bottlebrush polymeric delivery systems. The present polymeric delivery systems may be complexed with biological agents, including nucleic acids, peptides, proteins, or small molecules, for delivery to cells. In particular, the present polymeric delivery systems may be used for delivery of Cas protein in gene editing.