Zwitterionic Nucleic Acid Dyes for Safe Gel Staining
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Nucleic acid dyes used for gel staining pose safety concerns due to their potential mutagenicity and carcinogenicity, and existing alternatives like SYBR Safe may not be safe at higher concentrations, while also being cytotoxic and difficult to remove from nucleic acid samples, which complicates downstream analysis.
Innovation Solution
Development of nucleic acid binding dyes with a molecular weight less than 700 Da, lacking cell permeability, and being fully water soluble, with a zwitterionic structure that balances charges, ensuring safety and effective staining without interfering with nucleic acid recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional nucleic acid dyes like ethidium bromide are used for gel staining, then staining effectiveness is achieved, but mutagenicity and carcinogenicity increase
Solution Approach 1:
The patent modifies the molecular parameters of nucleic acid dyes by introducing zwitterionic groups with balanced positive and negative charges. This parameter change reduces the dyes' ability to penetrate cell membranes while maintaining their binding affinity to nucleic acids, thereby reducing mutagenicity without compromising staining effectiveness
Solution Approach 2:
The patent creates composite dye structures by combining fluorescent cores with zwitterionic substituents. These composite molecules integrate the staining capability of traditional dyes with the safety profile of larger, less permeable molecules, achieving both effectiveness and reduced harm
2Object-affected harmful factors
If dyes with large molecular size are used to reduce cell membrane permeability, then safety improves, but diffusion into polyacrylamide gels is impeded
Solution Approach 1:
The patent optimizes the molecular weight parameter to be less than 700 Da while incorporating zwitterionic groups. This parameter combination allows the dyes to remain small enough for efficient gel diffusion while the zwitterionic character reduces cell membrane permeability, resolving the contradiction between safety and ease of operation
3Measurement precision
If dyes are used at higher concentrations for effective staining, then detection sensitivity improves, but cytotoxicity increases
Solution Approach 1:
The patent changes the charge distribution parameter by incorporating zwitterionic groups with equal positive and negative charges. This modification reduces cytotoxicity at higher concentrations while maintaining detection sensitivity, as the balanced charges reduce harmful interactions with cellular components
4Reliability
If traditional dyes are used for staining, then nucleic acid detection is achieved, but removal from samples for downstream analysis becomes difficult
Solution Approach 1:
The patent employs water-soluble zwitterionic dyes that can be easily removed from nucleic acid samples through simple washing steps. The dyes serve their detection purpose and can be discarded without complicating downstream applications, embodying the disposable principle
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 dyes provide safe and sensitive nucleic acid staining with reduced mutagenicity and cytotoxicity, allowing for effective detection and easy removal from samples, maintaining resolution and versatility in detecting both DNA and RNA.
Implementation Method 1
Nucleic acid binding dyes can be intrinsically nonfluorescent or only weakly fluorescent by themselves but may become highly fluorescent upon binding to nucleic acids
Implementation Method 2
Binding of the dyes may take the mode of intercalation, where the dye may insert itself in between two adjacent nucleic acid base pair
Implementation Method 3
or it may take the mode of minor groove binding, where the dye may reside in the minor groove of a double-stranded nucleic acid
Data Source
AI summary
The invention provides compounds, including fluorescent nucleic acid dyes, and methods for use including nucleic acid detection. Further provided are kits, instruments and systems comprising compounds of the invention or adapted for use with compounds of the invention or other nucleic acid dyes.