Complementary T-Strands for Site-Directed Plant Genome Integration
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Solution Overview
Problem
Agrobacterium-mediated plant transformation often results in random integration of transgenes, which can be deleterious and affect gene expression due to position effects, necessitating a method for templated gene editing and site-directed integration.
Innovation Solution
The use of Rhizobiales cells capable of forming complementary T-strands, with specific border DNA sequences and vector configurations to initiate synthesis of sense and anti-sense oriented T-strands, facilitating targeted integration of sequences into plant genomes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Agrobacterium-mediated transformation is used to transfer transgenes into plant cells, then transformation efficiency is improved, but random integration of transgenes occurs causing position effects and deleterious effects
Solution Approach 1:
The patent applies preliminary action by designing vectors with pre-configured complementary T-strands that are synthesized in advance with specific orientations. The first and second T-strands are prepared with complementary sequences and opposite orientations (sense and anti-sense) before transformation, enabling them to anneal and form double-stranded DNA at the target site, thus guiding precise integration rather than random insertion.
Solution Approach 2:
The patent uses complementary T-strands as intermediaries to mediate between the Agrobacterium transformation system and the plant genome. These T-strands serve as a bridging mechanism that carries the transgene sequence of interest and facilitates site-directed integration through complementary base pairing, acting as an intermediary that converts random integration into targeted integration.
2Ease of manufacture
If random integration of transgenes occurs in plant genome, then transformation process is simple, but gene expression is affected due to position effects
Solution Approach 1:
The patent applies parameter changes by modifying the molecular parameters of the T-strand structure. Instead of using a single T-strand configuration, the invention uses two T-strands with complementary sequences and specific orientations (sense and anti-sense). This structural parameter change enables the T-strands to anneal and form stable double-stranded DNA at the integration site, ensuring reliable gene expression by placing the transgene in a controlled genomic context rather than subject to random position effects.
3Manufacturing precision
If site-directed integration is implemented using complementary T-strands, then integration precision is improved, but vector complexity increases
Solution Approach 1:
The patent applies merging by combining the functions of multiple T-strands into a single vector system. The first and second T-strands, along with their respective border sequences (RB1-LB1 and RB2-LB2), are integrated into the vector design to work together as a unified system. This merging of multiple functional elements into a coordinated vector structure achieves site-directed integration while managing complexity through functional integration rather than separate components.
Data Source
AI summary
The present disclosure is in the field of plant transformation. The disclosure provides methods for increasing the rate of site-directed integration of a sequence of interest in plants. The disclosure also provides methods for increasing the efficiency of Rhizobiales-mediated plant transformation.