Small-Molecule Grafted Cationic Polymer for Higher Gene Transfection
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Solution Overview
Problem
Existing cationic polymers exhibit low transfection efficiency in delivering nucleic acids into cells.
Innovation Solution
Grafting small molecules onto cationic polymer chains to form hydrogen bonds with nucleic acids, enhancing cellular uptake through endocytosis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional cationic polymers are used for gene transfection, then the basic transfection function is achieved, but the transfection efficiency is low
Solution Approach 1:
The patent applies composite materials by combining cationic polymer chains with small molecule compounds (such as fluorinated aromatic compounds, heterocyclic compounds, or their derivatives) to create a modified cationic polymer. This composite structure integrates the cationic properties of the polymer with the specific functional groups of the small molecules, resulting in enhanced transfection efficiency through improved nucleic acid binding and cellular uptake characteristics
Solution Approach 2:
The patent applies local quality by introducing specific functional groups (such as carboxyl, hydroxyl, amino, or carbonyl groups) at particular positions on the cationic polymer chains. These localized functional groups provide specific interactions with nucleic acids, creating regions of enhanced affinity and interaction that improve overall transfection efficiency without requiring modification of the entire polymer structure
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 cationic polymer achieves a 293F GFP positive rate of 70% or more, indicating improved transfection efficiency.
Implementation Method 1
By grafting small molecules onto the cationic polymer chains, the obtained modified cationic polymer has high transfection efficiency. The small molecules can form hydrogen bonds with nucleic acids
Implementation Method 2
The cationic polymers with positive charges are capable of making DNA into particles or aggregates at physiological pH, and facilitating the DNA binding to cells and entering cells by endocytosis
Data Source
AI summary
Provided is a modified cationic polymer and use thereof. The modified cationic polymer has a structure shown by Formula I or Formula II. The modified cationic polymer provided by the present application has small molecules grafted onto the cationic polymer, and thus the obtained modified cationic polymer has high transfection efficiency.