Mitochondrial DAB Dyes for Violet-Excited Live-Cell Imaging

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Solution Overview

Problem

Existing fluorescent mitochondrial stains require genetic manipulation for labeling and lack effective violet-excited dyes, limiting their application in fluorescence microscopy.

Innovation Solution

Development of 2,7-diaminobenzopyrylium (DAB) dyes that accumulate in mitochondria without genetic manipulation, exhibiting violet excitation and improved photostability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If fluorescent mitochondrial stains based on rhodamine and cyanine structures are used, then standard excitation windows (blue, green-yellow, red) are available, but violet excitation (405 nm) is not achieved

Engineering Contradiction:

Improveexcitation wavelengthVSAvoidexcitation window coverage

Core Design Contradiction:

Illumination intensityVSAdaptability or versatility

Solution Approach 1:

The patent modifies the chemical structure of fluorescent dyes by introducing 2,7-diaminobenzopyrylium core with specific substituents (R1-R6 groups) to shift the absorption maximum to violet region (405 nm), enabling excitation at this wavelength while maintaining mitochondrial staining capability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates composite fluorescent probes by combining the 2,7-diaminobenzopyrylium fluorophore with mitochondrial targeting moieties (such as lipophilic cationic groups) to achieve both violet excitation and selective mitochondrial accumulation

Inventive Principle:

Principle #40Composite materials

2Ease of operation

If fluorescent stains that accumulate in mitochondria due to chemical environment differences are used, then imaging without genetic manipulation is enabled, but photostability is insufficient

Engineering Contradiction:

Improvelabeling methodVSAvoidphotostability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent enhances photostability by modifying the dye molecular structure with rigidified scaffolds and electron-donating/withdrawing groups that reduce photoinduced degradation, while maintaining the lipophilic cationic character necessary for mitochondrial accumulation

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent develops small-molecule fluorescent stains that can be applied externally without genetic manipulation, accepting that they may have limited durability but providing sufficient signal for imaging applications through optimized brightness and photostability

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

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

Enables live-cell imaging of mitochondria with enhanced photostability and violet excitation, overcoming the limitations of existing stains.

Implementation Method 1

This unique membrane potential drives the accumulation of lipophilic cations into the matrix or inner membrane

Methodology Applied

Scientific EffectMembrane potential-driven accumulation: Electrostatic Induction

Implementation Method 2

Described herein is a new class of mitochondrial stains based on 2,7-diaminobenzopyrylium (DAB) dyes

Methodology Applied

Scientific EffectFluorescence: Fluorescence

Data Source

PatentUS12528944B2Live-cell fluorescent mitochondrial stains

Publication Date: 2026.01.20 INST HOWARD HUGHES MEDICAL

AI summary

Fluorescent stains are described, which enable imaging of cellular structures without the need for genetic manipulation. Unique diaminobenzopyrylium dyes are disclosed, together with their use as live-cell mitochondrial stains.