Modified Cationic Polymer Grafting for Stronger Nucleic Acid Uptake
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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
1Reliability
If cationic polymers are used as transfection reagents to transport DNA into cells, then DNA binding and cellular uptake are facilitated through positive charges, but transfection efficiency remains low
Solution Approach 1:
The patent applies composite materials by combining cationic polymer chains with grafted small molecule compounds to create a modified transfection reagent. The small molecules are covalently attached to the polymer backbone, forming a composite structure that integrates the DNA-binding capability of cationic polymers with the transfection-enhancing properties of small molecules, thereby resolving the low transfection efficiency issue
Solution Approach 2:
The patent implements local quality by grafting small molecules at specific locations on the cationic polymer chains. This localized modification allows different regions of the transfection reagent to perform different functions: the cationic polymer backbone provides DNA binding through positive charges, while the grafted small molecules enhance cellular uptake, creating functional heterogeneity that improves overall transfection efficiency
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 polymers achieve a 293F GFP positive rate of 70% or more, indicating improved transfection efficiency.
Implementation Method 1
Because amide bonds or thioamide bonds contained in the modified cationic polymer can form hydrogen bonds with heteroatoms on nucleic acids, the nucleic acid molecules are further compressed
Implementation Method 2
facilitating the DNA binding to cells and entering cells by endocytosis
Data Source
Figure 1
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.