Genetic Marker Generation via Random Mutagenesis for Plant Breeding
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Solution Overview
Problem
Marker-assisted selection in plant breeding is hindered by the challenge of identifying relevant markers, especially for traits encoded in regions of low polymorphism or complex quantitative trait loci, where markers may not be unique or closely linked, leading to issues like linkage drag.
Innovation Solution
The method involves de novo generation and introduction of genetic markers through random mutagenesis, allowing for the identification and selection of markers linked to genomic regions of interest, even in areas of low polymorphism, without prior knowledge of the trait's location, thereby fine-mapping the locus and minimizing linkage drag.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If phenotypic screening and selection is used to identify plants with desired traits, then accurate trait evaluation can be achieved, but the process becomes cumbersome and time-consuming as plants must be grown to maturity
Solution Approach 1:
The patent applies preliminary action by introducing mutations and creating genetic markers in advance, before phenotypic evaluation is needed. These pre-established markers can then be used for rapid selection without waiting for plants to mature, thus reducing breeding cycle time while maintaining selection accuracy
Solution Approach 2:
The patent uses genetic markers as an intermediary between the trait of interest and the selection process. Instead of directly evaluating the trait phenotype, markers serve as proxies that indicate the presence of desired traits, enabling indirect but accurate selection without time-consuming phenotypic assessment
2Productivity
If markers are used for early stage selection, then breeding efficiency is improved, but relevant markers are difficult to identify especially in regions of low polymorphism or complex QTL
Solution Approach 1:
The patent segments the challenge of marker identification by focusing on creating markers through random mutagenesis in specific genomic regions rather than searching for existing natural polymorphisms. This approach divides the problem into manageable steps: induce mutations, screen for markers, and validate linkage
Solution Approach 2:
The patent applies preliminary action by proactively introducing mutations to create markers before the breeding selection process begins. This eliminates the need to search for pre-existing markers in low-polymorphism regions, as markers are generated de novo through mutagenesis
3Measurement precision
If markers are used to select against linkage drag, then selection precision is improved, but markers must be in close proximity to the trait which limits available options
Solution Approach 1:
The patent applies preliminary action by introducing multiple random mutations across the genome before selection. This creates a pool of potential markers at various distances from target traits, providing versatility in marker selection while ensuring some markers will be in close proximity for precise selection against linkage drag
Solution Approach 2:
The patent uses partial or excessive action by introducing more mutations than strictly necessary. This excess mutagenesis ensures that sufficient markers are created in close proximity to all relevant traits, providing multiple options for precise selection and overcoming the limitation of marker availability
Data Source
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AI summary
The present invention relates to a method for introducing mutations in the nucleotide sequence of a 5' or 3' flanking region of a genomic region of interest in plants by chemical treatment or radiation. These introduced mutations are used to develop genetic markers, which are linked to said genomic region of interest and allow for precise selection thereof. The present invention further relates to a method for generating such genetic markers, a method for detecting a genomic region of interest with said genetic markers as well as to a method for identifying plants comprising such genetic markers.