Modified CENPC Protein Haploid Induction in Crop Breeding
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Solution Overview
Problem
Current methods for producing haploid and doubled haploid plants are time-consuming and costly, and existing techniques such as microspore culture are not effective for all crop species, with limited success in inducing uni-parental genome elimination using modified CenH3 proteins.
Innovation Solution
Introduction of CENPC proteins with specific active mutations, such as G to T nucleotide modifications leading to H amino acid insertion, D to K amino acid modification, and N to Y amino acid modification, which induce haploid offspring when crossed with wild-type plants, allowing for the production of doubled haploid plants through genome doubling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If microspore culture methods are used to produce haploid plants, then haploid plants can be obtained in some crops, but the process is costly and time-consuming and does not work in many crops
Solution Approach 1:
The invention changes the molecular parameters of the CENPC protein by introducing specific amino acid modifications (H at position 553, D to K at position 554, N to Y at position 555, M to V at position 556) to create a haploid-inducing variant that works across multiple crop species, resolving the contradiction between production efficiency and species adaptability
Solution Approach 2:
The invention replaces the mechanical/tissue culture-based microspore culture method with a molecular/biological approach using modified CENPC proteins to induce haploid formation, thereby eliminating the need for complex culture systems and improving both efficiency and applicability
2Productivity
If modified CenH3 proteins are used to induce uni-parental genome elimination, then haploid plants can be produced, but the method has only been demonstrated in model plants and not in crop plants
Solution Approach 1:
The invention modifies the CENPC protein parameters with specific amino acid changes that are functional in crop plants, extending the applicability from model plants to economically important crops while maintaining haploid induction efficiency
Solution Approach 2:
The modified CENPC protein achieves universal functionality across different plant species including crops, serving as a multi-functional tool for haploid induction in diverse genetic backgrounds
3Manufacturing precision
If extensive selfing is performed to reduce heterozygosity, then homozygosity can be achieved, but the process requires at least 7 generations and is time-consuming
Solution Approach 1:
The modified CENPC protein performs the preliminary action of inducing genome elimination and haploid formation before selfing is required, allowing direct production of homozygous doubled haploid plants and eliminating the need for multiple generations of selfing
Solution Approach 2:
The invention skips the time-consuming intermediate generations of selfing by directly producing haploid plants that can be doubled to achieve homozygosity in one generation, thereby rushing through the traditional multi-generational breeding process
Data Source
AI summary
It was found that plants comprising modified CENPC protein comprising one or more active mutations which affect the functioning of CENPC protein yet allow plants expressing said modified CENPC protein to be viable, are able to induce haploid offspring after a cross to or with a wild type plant comprising a endogenous CENPC protein. The invention relates to generation of haploid and doubled haploid plants.