Guide RNA/Cas Plant Genome Editing for Precise Integration
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Solution Overview
Problem
Existing methods for altering plant genomes are inefficient and unpredictable, often resulting in random integration of transgenes and lack the ability to produce fertile plants with defined genetic modifications.
Innovation Solution
Employing a guide RNA/Cas endonuclease system to introduce targeted double-strand breaks in plant genomes, allowing for precise modification, insertion, or deletion of nucleotides, and enabling the production of plants with specific genetic alterations through crossing and selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If Agrobacterium infection or biolistic particle bombardment is used for plant transformation, then foreign DNA sequences can be inserted into the plant genome, but the integration is random and unpredictable in copy number
Solution Approach 1:
The patent employs Agrobacterium tumefaciens as a biological intermediary vector to deliver transgenes into plant cells. The Agrobacterium carries the transgene within a T-DNA region that is naturally capable of integrating into the plant genome, serving as a mediator between the foreign DNA and the plant genome. This approach improves ease of manufacture while the use of specific binary vector systems and selection markers helps control integration precision.
Solution Approach 2:
The patent replaces mechanical biolistic particle bombardment methods with biological Agrobacterium-mediated transformation. Instead of using physical force to deliver DNA-coated particles into plant cells, the system uses the natural biological machinery of Agrobacterium to transfer and integrate T-DNA into the plant genome, thereby improving ease of manufacture and reducing mechanical damage to plant tissues.
2Productivity
If traditional transformation methods are used, then transgenes can be introduced into plants, but the copy number and integration site are unpredictable
Solution Approach 1:
The patent incorporates selectable marker genes (such as antibiotic resistance genes or herbicide resistance genes) into the T-DNA construct. After transformation, plant cells that have successfully integrated the transgene exhibit a selectable phenotype (e.g., resistance to antibiotics or herbicides), providing feedback that allows researchers to identify and select transformed cells. This feedback mechanism improves transformation efficiency by enabling easy identification of successful integrations while maintaining control over the number of copies integrated through selection pressure.
3Manufacturing precision
If site-specific recombination is used for targeted DNA modification, then transgene integration can be controlled at predetermined sequences, but the method complexity increases
Solution Approach 1:
The patent uses the universal Agrobacterium transformation system that can accommodate multiple different T-DNA constructs with various transgenes and marker genes. The same basic transformation protocol and Agrobacterium strain can be used for different plant species and different genetic modifications, reducing method complexity while maintaining precision through the use of specific promoter regions and boundary sequences in the T-DNA construct.
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
This approach enables the precise and efficient modification of plant genomes, facilitating the production of fertile plants with defined genetic changes and allowing for gene editing and breeding methods.
Implementation Method 1
a guide RNA/Cas endonuclease system to provide for an effective system for modifying or altering target sites and nucleotides of interest within the genome of a plant
Data Source
AI summary
Compositions and methods are provided for genome modification of a target sequence in the genome of a plant or plant cell. The methods and compositions employ a guide RNA/Cas endonuclease system to provide an effective system for modifying or altering target sites within the genome of a plant, plant cell or seed. Also provided are compositions and methods employing a guide polynucleotide/Cas endonuclease system for genome modification of a nucleotide sequence in the genome of a cell or organism, for gene editing, and/or for inserting or deleting a polynucleotide of interest into or from the genome of a cell or organism. Once a genomic target site is identified, a variety of methods can be employed to further modify the target sites such that they contain a variety of polynucleotides of interest. Breeding methods and methods for selecting plants utilizing a two component RNA guide and Cas endonuclease system are also disclosed. Compositions and methods are also provided for editing a nucleotide sequence in the genome of a cell.