Light-Responsive DNA-Binding Protein for Rapid Gene Expression Control

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Solution Overview

Problem

Current gene regulatory systems in molecular biology rely on chemical inducers that require entry into cells and lack rapid on/off control, making them inefficient for precise and rapid gene expression manipulation in eukaryotic cells.

Innovation Solution

Development of a light-responsive DNA-binding protein (LRDP) comprising a LOV domain and a DNA binding domain from a homologous species, operatively linked to a heterologous transcription activation domain, which activates transcription in response to blue light, allowing for precise and rapid gene expression control.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If chemical inducer molecules are used for gene regulation, then gene expression can be controlled, but the system requires addition of small chemical inducers and cannot turn gene expression on and off rapidly

Engineering Contradiction:

Improvegene expression controlVSAvoidresponse speed

Core Design Contradiction:

Ease of operationVSSpeed

Solution Approach 1:

The patent replaces chemical induction with optical control using a light-responsive DNA-binding protein (LRDP) system. Blue light activates the LOV domain to bind DNA and initiate transcription, while red light deactivates it. This optical substitution eliminates the need for chemical inducers and enables rapid on/off control of gene expression.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent utilizes light wavelength as a controllable parameter to regulate gene expression. By changing the wavelength (blue light for activation, red light for deactivation), the system achieves rapid and reversible control of transcription without chemical additives.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If chemical inducer molecules are used for gene regulation, then gene expression can be activated, but the system lacks rapid on/off switching capability

Engineering Contradiction:

Improvegene expression activationVSAvoidgene expression duration control

Core Design Contradiction:

Adaptability or versatilityVSDuration of action of moving object

Solution Approach 1:

The patent employs periodic illumination with alternating blue and red light to achieve reversible gene expression control. Blue light pulses activate transcription temporarily, while red light pulses terminate it, enabling precise temporal control of gene expression duration through periodic optical stimulation.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The LRDP system transforms static chemical induction into a dynamic, reversible process. The light-responsive protein can rapidly switch between active (blue light) and inactive (red light) states, allowing real-time adjustment of gene expression duration and intensity without chemical residue or delayed termination.

Inventive Principle:

Principle #15Dynamics

3Productivity

If chemical inducers are used, then transcriptional activation can occur, but the system requires external chemical addition and lacks rapid reversibility

Engineering Contradiction:

Improvetranscriptional activation efficiencyVSAvoidtime for inducer addition and effect onset

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The patent expresses the light-responsive DNA-binding protein (LRDP) constitutively in cells beforehand, so that upon blue light illumination, transcription activation occurs immediately without waiting for chemical inducer entry and binding. The protein is already in position to bind DNA and initiate transcription upon light exposure.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent substitutes chemical diffusion and binding processes with direct optical activation. Blue light penetrates cells and instantly activates the LOV domain's DNA-binding capability, eliminating the time required for chemical inducer diffusion, cellular uptake, and target protein binding.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 system enables efficient and reversible activation of gene expression in eukaryotic cells, achieving up to 108-fold transcriptional activation with blue light exposure and quick shut-off after illumination ceases, overcoming limitations of chemical-based systems.

Implementation Method 1

a light responsive DNA binding protein (LRDP) comprising: a LOV domain; and a DNA binding domain (DBD), wherein said LOV domain and DBD are from a homologous species

Methodology Applied

Scientific EffectPhotoreception by LOV domain: Photochromism

Data Source

PatentUS10221422B2Blue light-inducible system for gene expression

Publication Date: 2019.03.05 BOARD OF RGT THE UNIV OF TEXAS SYST

AI summary

The present invention provides methods for light-dependent gene regulation using a light-responsive DNA-binding protein. Also provided are related nucleic acid molecules, and protein molecules, such as those encoding or comprising the light-responsive DNA-binding protein or DNA-binding sites recognizing the light-responsive DNA-binding protein. Kits using the present light-dependent gene regulation system are further provided by the present invention.