Light-Inducible Promoter for Microalgae Gene Expression Control
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Solution Overview
Problem
Current microalgae transgenic technologies face challenges with low transformation and gene expression efficiency, and existing promoters are limited in their applicability, burdening growth processes and having narrow application ranges, especially for regulating gene expression in various organisms.
Innovation Solution
A light-inducible promoter system, including specific nucleotide sequences, is developed to regulate gene expression in microalgae based on light intensity, allowing for efficient production of exogenous proteins without affecting the growth or metabolic processes of microalgae and applicable to various organisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If thermal shock is used to induce gene expression, then gene expression efficiency is improved, but the growth and metabolic processes of algae are burdened
Solution Approach 1:
The patent changes the induction parameter from thermal shock to light irradiation. The light-inducible promoter contains specific nucleotide sequences (SEQ ID NOs: 1-11) that respond to light signals, enabling gene expression induction through light intensity and duration control without thermal stress, thus resolving the contradiction between expression efficiency and organismal burden
Solution Approach 2:
The patent replaces the mechanical/thermal induction system with an optical induction system. By using light-inducible promoters instead of heat-shock promoters, the system substitutes thermal energy with optical energy for gene expression induction, eliminating the harmful thermal effects on algal growth while maintaining effective gene expression control
2Productivity
If promoters derived from specific microalgae are used, then transformation efficiency is improved, but the range of application is narrowed
Solution Approach 1:
The patent creates a universal light-inducible promoter system that can be applied across multiple microalgal species. The promoter contains conserved nucleotide sequences (SEQ ID NOs: 1-11) that function across different species, making it versatile while maintaining high transformation efficiency. This allows the same promoter construct to work in various microalgae types, resolving the contradiction between efficiency and applicability range
3Ease of operation
If conventional promoters are used for gene expression, then expression regulation is achieved, but the complexity of the system increases
Solution Approach 1:
The patent extracts and utilizes the light-responsive elements from natural photosynthetic organisms and integrates them into a simplified promoter construct. The light-inducible promoter contains specific nucleotide sequences (SEQ ID NOs: 1-11) that directly respond to light signals without requiring complex regulatory cascades, thereby simplifying the gene expression system while maintaining effective regulation capability
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 light-inducible promoter system effectively regulates gene expression in microalgae, ensuring high transformation efficiency and wide applicability, with the expression level controlled by light intensity, facilitating the production of exogenous proteins in different microorganisms.
Implementation Method 1
a light-inducible promoter which induces expression of a gene by irradiation of light and regulates an expression level of the gene according to intensity of light
Data Source
AI summary
The present invention relates to a light-inducible promoter and a gene expression system containing the same, and provides: a light-inducible promoter comprising a nucleotide sequence represented by SEQ ID NO: 12; and a method for producing heterologous proteins using the same. Since the light-inducible promoter of the present invention induces the expression of a gene by the irradiation of light and regulates an expression amount of the gene according to an intensity of light, it is possible to conveniently regulate the expression of the gene without straining the growth or metabolic process of an organism. In addition, the present invention can be applied to various types of organisms, and thus has a wide range of application.