Manipulating Plant Self-Incompatibility via TALEN Cleavage
Solution Overview
Problem
Current methods for controlling self-incompatibility in plants, particularly in the Poaceae family, lack effective genetic tools to manipulate self-incompatibility mechanisms, limiting the production of hybrid plants and seed yields in outbreeding crops.
Innovation Solution
The use of genomics and transgenic modification techniques to identify and modify the S and Z genes, employing transcription activator-like effector nucleases (TALENs) or zinc-finger nucleases (ZFNs) to cleave specific sites in the nucleic acid sequence, allowing for the control of fertilization and hybridization by altering the self-incompatibility status of plants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional breeding approaches are used, then hybrid plant production is limited by self-incompatibility mechanisms, but transgenic modification techniques increase device complexity and cost
Solution Approach 1:
The patent extracts and removes the self-incompatibility barrier by using TALENs or ZFNs to cleave specific sites in the S and Z gene nucleic acid sequences. This extraction of the inhibitory genetic elements enables hybrid plant production that would otherwise be blocked by natural self-incompatibility mechanisms.
Solution Approach 2:
The patent introduces intermediary molecules (TALENs or ZFNs) that act as mediators between the desired trait (hybridization capability) and the genetic target (S and Z genes). These intermediary tools enable precise genetic modification without requiring complex complete gene replacement systems.
2Productivity
If self-incompatibility mechanisms are maintained, then natural reproductive control is preserved, but seed yields and hybrid plant production are reduced
Solution Approach 1:
The patent performs preliminary action by modifying the S and Z genes before hybridization occurs. By using TALENs or ZFNs to cleave specific sites in these genes in advance, the self-incompatibility barrier is removed prior to fertilization, enabling both high seed yield and controlled hybridization.
Solution Approach 2:
The patent changes the genetic parameters of the S and Z genes by introducing specific cleavage sites that alter gene function. This parameter change transforms the self-incompatibility phenotype into a compatible state, allowing controlled hybridization while maintaining reproductive reliability through predictable genetic modification.
3Measurement precision
If molecular markers are used for predictive control, then fertilization control precision is improved, but measurement and detection complexity increases
Solution Approach 1:
The patent uses molecular markers as copies or proxies for the actual S and Z gene states. Instead of directly analyzing complex gene sequences, simpler marker molecules are detected that correlate with the genetic modification status, providing predictive control of fertilization with reduced measurement complexity.
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
Enables the production of hybrid plants in higher numbers than conventional breeding approaches, improving seed yields and providing a predictive means for controlling fertilization through molecular markers.
Implementation Method 1
employing transcription activator-like effector nucleases (TALENs) or zinc-finger nucleases (ZFNs) to cleave specific sites in the nucleic acid sequence
Data Source
AI summary
The present invention relates to methods for controlling hybridization in plants and producing hybrid plants. The present invention also relates to nucleic acids encoding amino acid sequences for self-incompatibility (SI) proteins in plants, and the use thereof for the manipulation of SI, including seed production, in plants, particularly of the Poaceae family. The present invention also relates to kits, compositions, constructs and vectors including such nucleic acids, and related polypeptides, regulatory elements and methods. The present invention also relates to expression of self-gamete recognition genes in plants and to related nucleic acids, constructs, molecular markers and methods.