Reverse Breeding for Rapid Homozygous Line Production
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Solution Overview
Problem
Traditional methods for producing homozygous parental lines for hybrid organisms are time-consuming and inefficient, requiring multiple generations of inbreeding and selection, which is particularly challenging for plants and animals due to the complexity of meiotic recombination processes.
Innovation Solution
A method involving the suppression of recombination in heterozygous organisms to produce homozygous lines by preventing or reducing meiotic recombination during the formation of haploid cells, using techniques such as interfering with target genes involved in recombination, chemical treatments, and genetic modification to create homozygous organisms that can be used to produce hybrid offspring efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional inbreeding and selection methods are used to produce homozygous parental lines, then homozygosity is achieved, but the process is time-consuming and inefficient
Solution Approach 1:
The patent inverts the traditional breeding approach by starting with a heterozygous F1 hybrid and working backwards to produce homozygous parental lines, rather than starting with homozygous lines and crossing them. This is achieved by inducing unreduced gametes (2n) from the F1 hybrid, which then self-fertilize to produce homozygous F2 individuals that resemble the original parental lines, thereby dramatically reducing the time required to achieve homozygosity.
Solution Approach 2:
The patent changes the chromosomal parameter by inducing unreduced gametes (2n) instead of normal reduced gametes (n). This parameter change in gamete ploidy level allows the F1 hybrid to produce homozygous offspring directly, bypassing the need for multiple generations of inbreeding and achieving homozygosity in a single generation.
2Manufacturing precision
If multiple generations of inbreeding are performed to produce homozygous lines, then homozygosity increases, but the complexity of meiotic recombination makes the process challenging
Solution Approach 1:
The patent bypasses the complex meiotic recombination process by inverting the breeding direction and using unreduced gametes that undergo mitotic division rather than meiotic recombination. This eliminates the complexity of tracking and managing recombination events across multiple generations while still achieving complete homozygosity.
Solution Approach 2:
The patent replaces the mechanical process of multiple generations of crossing and selection with a biological mechanism involving unreduced gametes and spontaneous homozygosis. This substitution eliminates the need for complex breeding management and phenotypic selection across generations, simplifying the overall process.
3Reliability
If traditional hybrid production methods are used, then hybrid offspring with desired traits are obtained, but extensive inbreeding is required which reduces breeding flexibility
Solution Approach 1:
The patent provides breeding flexibility by allowing the production of multiple different homozygous parental lines from a single F1 hybrid through the unreduced gamete method. Breeders can selectively choose which homozygous lines to develop into new F1 hybrids, enabling rapid adaptation and selection of different trait combinations without being constrained by traditional inbreeding paths.
Data Source
AI summary
A method for efficiently producing homozygous organisms from a heterozygous non-human starting organism, comprising providing of a heterozygous starting organism; allowing the starting organism to produce haploid cells; creating homozygous organisms from the haploid cells thus obtained; and selecting the organisms having the desired set of chromosomes, wherein during production of the haploid cells no recombination occurs in order to obtain a limited number of genetically different haploid cells. Recombination can also be prevented or suppressed.