Maize WOX2a Gene Induces Somatic Embryogenesis

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Solution Overview

Problem

Efficient production of transgenic plants remains a major barrier due to recalcitrance in many plant species, which are difficult to transform and regenerate, hindering crop improvement.

Innovation Solution

The use of constructs comprising the WUSCHEL-like homeobox 2a (WOX2A) gene operably connected to a heterologous promoter to induce somatic embryogenesis in plant tissues, specifically in recalcitrant maize lines like B73.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional transformation methods are used on recalcitrant plant species, then transformation efficiency remains low, but the complexity of the transformation process increases

Engineering Contradiction:

Improvetransformation efficiencyVSAvoidtransformation process complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent changes the genetic parameter by introducing WOX2A gene expression to alter the developmental state of plant cells, inducing somatic embryogenesis in recalcitrant species. This parameter change enables transformation in species that were previously difficult to transform, directly improving transformation efficiency without increasing process complexity

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent performs preliminary action by pre-inducing somatic embryogenesis through WOX2A expression before attempting transformation. This preliminary developmental reprogramming creates a more receptive state for subsequent transformation events, improving overall efficiency while maintaining straightforward procedural steps

Inventive Principle:

Principle #10Preliminary action

2Productivity

If heterologous tissue culture response genes are used to induce somatic embryogenesis, then embryo formation is achieved, but deleterious effects occur in the regenerated plants

Engineering Contradiction:

Improvesomatic embryo formationVSAvoiddeleterious effects in regenerated plants

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The patent changes the genetic parameter from heterologous genes to the native WOX2A gene, which is endogenous to maize. This parameter change maintains the ability to induce somatic embryogenesis while eliminating the deleterious effects associated with heterologous gene expression, such as developmental abnormalities and reduced fertility in regenerated plants

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent applies self-service by using the plant's own native WOX2A gene rather than external heterologous genes. This self-service approach ensures compatibility with the plant's natural developmental pathways, avoiding the harmful effects that arise from introducing foreign genetic elements that may not be properly regulated or integrated

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS20250098609A1Maize WOX2a over-expression induces somatic embryo formation

Publication Date: 2025.03.27 WISCONSIN ALUMNI RES FOUND

AI summary

The present invention provides constructs comprising a WUSCHEL-like homeobox 2a (WOX2A) gene operably connected to a heterologous promoter. Also provided are methods of using these constructs to induce somatic embryogenesis in a plant tissue. Plants produced using these methods are also provided. The plants may include maize, wheat, rice, barley, oats, rye, and sorghum.