Mitochondrial Herbicide-Resistance Genes for Selectable Plant Transformation
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Solution Overview
Problem
Existing methods for modifying mitochondrial genomes in plants are challenging and require new selectable marker genes to facilitate editing and identification of transformed mitochondria.
Innovation Solution
Introduce a first polynucleotide encoding a variant of a naturally occurring polypeptide with herbicide-resistant enzyme activity into plant or algal mitochondria, followed by expression under herbicide conditions to select for transformed cells with edited mitochondrial genomes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing methods for modifying mitochondrial genomes are used, then mitochondrial transformation can be achieved, but the process is challenging and requires new selectable marker genes
Solution Approach 1:
The patent applies universality by making the herbicide resistance gene serve dual functions: (1) as a selectable marker to identify transformed mitochondria during the transformation process, and (2) as a functional trait that confers herbicide tolerance to the final transgenic plant. This eliminates the need for separate selectable markers and reduces overall system complexity while maintaining reliable transformation selection.
2Adaptability or versatility
If herbicide-resistant polypeptide variants are introduced into mitochondria, then herbicide resistance is achieved, but the method requires precise identification and selection of transformed cells
Solution Approach 1:
The patent applies self-service by using the herbicide resistance trait itself as the selection mechanism. Transformed cells that have incorporated the herbicide-resistant polypeptide variant automatically gain the ability to survive and grow in the presence of herbicide, providing self-indicating selection without requiring additional detection systems or markers. This simplifies the detection and measurement of transformed cells.
Data Source
AI summary
The present disclosure relates to genetically modified cells containing mitochondria that have been transformed with a polynucleotide encoding an herbicide-resistant enzyme, such that the cells can grow in the presence of an inhibitor of the enzyme.