PtrhAT Gene Modification for Lignin and Sugar Release
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Solution Overview
Problem
Current technologies lack the ability to flexibly modulate the expression of MYB46, a key regulator of secondary cell wall biosynthesis and lignin production in plants, limiting the production of plant-based flavonoids, biofuels, and pathogen-resistant strains.
Innovation Solution
Genetically modifying plants to express or inactivate the PtrhAT gene, using CRISPR/Cas system or other genome editing methods, to alter lignin content and sugar release by modifying the DNA binding activity of the PtrhAT protein.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If MYB46 expression is upregulated to increase lignin biosynthesis, then lignin content increases, but flexibility to modulate expression is limited
Solution Approach 1:
The patent introduces PtrhAT as an intermediary repressor protein that binds to the MYB46 promoter to indirectly regulate MYB46 expression. Instead of directly manipulating MYB46, the system uses PtrhAT as a mediator that can be controlled through its DNA binding activity, providing flexible modulation of lignin biosynthesis through an intermediate regulatory layer.
Solution Approach 2:
The patent employs genome editing to modify the DNA binding activity parameter of PtrhAT protein. By changing this specific molecular parameter (DNA binding affinity), the system achieves flexible control over MYB46 expression levels and consequently over lignin content, transforming a binary on/off control into a tunable system.
2Adaptability or versatility
If genome editing methods like CRISPR/Cas are used to modify PtrhAT, then flexibility to modulate lignin biosynthesis is improved, but device complexity increases
Solution Approach 1:
The patent extracts and modifies only the critical DNA binding domain of PtrhAT using genome editing, rather than attempting to control the entire complex regulatory network. By isolating and editing this specific functional element, the system achieves flexible modulation of lignin biosynthesis while minimizing the complexity burden of the overall genetic system.
3Quantity of substance
If PtrhAT DNA binding activity is increased to repress MYB46, then lignin content decreases, but sugar release is adversely affected
Solution Approach 1:
The patent creates a dynamic regulatory system where PtrhAT's DNA binding activity can be precisely adjusted to achieve the desired balance between lignin content and sugar release. By making the repressor activity tunable rather than fixed, the system can dynamically optimize both parameters according to specific application requirements, resolving the trade-off between these two important properties.
Data Source
AI summary
This disclosure provides genetically modified plants, plant cells and plant tissues that show modified lignin content and/or sugar release as compared to a wild type control plant which was not genetically modified. In addition, the disclosure provides methods of regulating lignin content and sugar release in a plant. The disclosure also provides methods of producing bioproducts using the genetically modified plants of the instant disclosure.