Functionalized Nanoparticle Delivery of Linear DNA Cassettes in Plants
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Solution Overview
Problem
Current methods for delivering foreign nucleic acid molecules into plant cells are invasive and hindered by the plant cell wall, often resulting in undesirable integration of vector backbone sequences and limited success in genetic transformation, especially for plants with intact cell walls.
Innovation Solution
The use of functionalized linear nucleic acid cassette molecules conjugated to nanoparticles, such as quantum dots or gold nanoparticles, allows for non-invasive delivery into plant cells with intact cell walls, avoiding vector backbone sequences and enabling stable genomic integration of specific gene sequences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If invasive delivery methods (biolistic delivery, microinjection, electroporation, Agrobacterium-mediated transformation) are used to deliver foreign nucleic acid molecules into plant cells, then delivery into walled plant cells can be achieved, but the cell wall must be compromised or invasive procedures performed, causing cellular stress and potential damage
Solution Approach 1:
The patent uses nanoparticles as intermediary carriers to deliver linear nucleic acid cassettes into plant cells. The nanoparticles functionalized with cell-penetrating peptides enable non-invasive uptake of the nucleic acid cargo through the intact cell wall and membrane, avoiding direct invasive procedures while maintaining delivery efficiency
Solution Approach 2:
The patent replaces mechanical invasive delivery methods (biolistic bombardment, microinjection needles, electroporation electric fields) with a biochemical uptake mechanism where functionalized nanoparticles are naturally internalized by plant cells through endocytosis or membrane translocation, substituting mechanical force with biological recognition and uptake processes
2Reliability
If conventional plant transformation techniques (Agrobacterium-mediated transformation) are used, then genetic transformation can be achieved, but vector backbone sequences are integrated into the host genome along with the exogenous genes
Solution Approach 1:
The patent extracts only the essential functional elements (exogenous genes of interest) from the complete plasmid structure, using linear nucleic acid cassettes that contain solely the desired transgenic sequences without vector backbone, origin of replication, or antibiotic resistance markers, thereby eliminating unwanted genomic integration
Solution Approach 2:
The patent segments the nucleic acid delivery system into a minimal functional cassette containing only the necessary exogenous genes and regulatory elements, separating them from the vector backbone sequences that would otherwise be co-integrated into the plant genome during transformation
3Ease of operation
If cell wall stripping is performed before nanoparticle addition to enable nanoparticle delivery, then nanoparticle uptake can occur, but the cell wall integrity is compromised and additional processing steps are required
Solution Approach 1:
The patent changes the surface properties of nanoparticles by functionalizing them with cell-penetrating peptides and hydrophilic coatings, enabling these modified nanoparticles to interact with and penetrate intact plant cell walls and membranes without requiring cell wall removal, thus maintaining cell integrity while achieving uptake
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 method facilitates the stable transformation of plants by delivering specific gene sequences without undesirable nucleic acid sequences, achieving high transformation frequencies and fertile transgenic plants with desired traits, such as herbicide tolerance, without the need for invasive techniques or vector backbone integration.
Implementation Method 1
the cells take up the nanoparticles and begin expressing genes encoded on the DNA
Implementation Method 2
Carboxylic acid- or amine-coated QDs can be cross-linked to molecules containing a thiol group
Implementation Method 3
by using standard bioconjugation protocols
Implementation Method 4
An alternative way to attach molecules to the surface of QDs is via conjugation of streptavidin-coated QDs to biotinylated proteins, oligonucleotides, or antibodies
Data Source
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AI summary
Methods for introducing a functionalized linear nucleic acid cassette molecule of interest into a plant cell comprising a cell wall include use of nanoparticles. In some embodiments, the cell comprising a cell wall is a cultured plant cell. Methods include genetically or otherwise modifying plant cells and for treating or preventing disease in any plant, especially crop plants. Transgenic plants include a nucleic acid molecule of interest produced by regeneration of whole plants from plant cells transformed with functionalized linear nucleic acid cassette molecules.