Actinomycin-Based Near-IR Nucleic Acid Stains for Rapid Cell Cycle Analysis
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Solution Overview
Problem
Current fluorescent dyes like 7-AAD require long incubation times for staining and exhibit high variability in DNA content cell cycle analysis, making them unsuitable for high-throughput applications and rapid analysis.
Innovation Solution
Development of actinomycin-based near IR emitting compounds that selectively and rapidly stain cells with compromised membranes, reducing incubation times and minimizing variability in DNA content cell cycle analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If 7-AAD is used as a nuclear stain, then DNA affinity and fluorescence emission are achieved, but incubation time is prolonged
Solution Approach 1:
The patent modifies the chemical structure of actinomycin D by replacing the phenolic hydroxyl group with various substituents (R1-R6 groups including aromatic rings, heterocycles, and alkyl chains), which changes the molecular parameters to achieve both rapid membrane permeation and strong DNA binding affinity, reducing incubation time from 30 minutes to 5 minutes or less
2Measurement precision
If 7-AAD is used for DNA content cell cycle analysis, then DNA staining is achieved, but measurement variability increases
Solution Approach 1:
The structural modifications to actinomycin D (changing R groups at positions 4a and 12a) alter the binding parameters and stoichiometry, resulting in more uniform DNA staining with reduced coefficient of variation in G0G1 peak measurements, thereby improving reliability of cell cycle analysis
3Object-affected harmful factors
If fluorescent dyes with longer wavelength are used, then background interference is reduced, but detection sensitivity decreases
Solution Approach 1:
The patent creates composite fluorescent structures by combining actinomycin D core with various aromatic and heterocyclic substituents, achieving a balance where the extended conjugation system provides near-infrared emission (reducing background interference) while maintaining strong absorption coefficients and fluorescence quantum yields for sensitive detection
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 actinomycin-based compounds enable rapid staining and analysis, providing low variability in DNA content cell cycle measurements and stability under intense illumination, making them suitable for high-throughput applications and multiplex assays.
Implementation Method 1
The actinomycin-based compounds of the invention selectively and rapidly associate with nucleic acid molecules... exhibit very long wavelength emission bands upon excitation with light of an appropriate wavelength
Implementation Method 2
Certain fluorescent compounds have a strong affinity for DNA and can serve as a fluorescent marker for DNA... 7-AAD can be efficiently excited using standard helium-neon and argon lasers
Data Source
AI summary
Actinomysin-based near IR emitting compounds and methods of their use as nucleic acid stains are provided. The actinomysin-based near IR emitting compounds have the structure:wherein R is H or NH2; R1, R2, R3, and R4 are independently a moiety comprising 1-30 atoms selected from H, O, C, and N, wherein the atoms are in a linear, branched, or cyclic configuration; R3 and/or R4 comprise a quaternary nitrogen atom; and R5 is H, F, or Cl.