Related Experiment Video
Updated: Aug 14, 2026
11:37
QTL Mapping and CRISPR/Cas9 Editing to Identify a Drug Resistance Gene in Toxoplasma gondii
Published on: June 22, 2017
Quantitative trait locus (QTL) isogenic recombinant analysis: a method for high-resolution mapping of QTL within a
Johan D Peleman1, Crispin Wye, Jan Zethof
1Keygene N.V., NL-6708 PW, Wageningen, The Netherlands. johan.peleman@keygene.com
Genetics
|August 9, 2005
Summary
This study introduces a faster method for quantitative trait loci (QTL) fine mapping using a single segregating population. It identifies QTL isogenic recombinants (QIRs) for efficient phenotyping, reducing overall research efforts.
Area of Science:
- Genetics and Genomics
- Plant Breeding
- Quantitative Genetics
Background:
- Fine mapping quantitative trait loci (QTL) to a subcentimorgan scale is crucial for understanding complex traits.
- Existing methods often require extensive resources, including the generation of large progenies from inbred lines.
Purpose of the Study:
- To present an alternative, accelerated method for QTL fine mapping.
- To significantly reduce the genotyping and phenotyping efforts required for fine mapping.
Main Methods:
- Initial rough mapping of QTL on a small population subset.
- Selection of QTL isogenic recombinants (QIRs) from a large population (≥1000 plants) using flanking markers.
- QIRs possess recombination within the target QTL interval while maintaining homozygous genotypes elsewhere.
- Subsequent phenotyping focused exclusively on selected QIRs for high-resolution mapping.
Main Results:
- Demonstrated the efficacy of the QIR-based approach for QTL fine mapping.
- Successfully fine-mapped an erucic acid QTL in rapeseed at a subcentimorgan resolution.
- Significant reduction in genotyping and phenotyping workload compared to traditional methods.
Conclusions:
- The proposed method offers a substantial acceleration in QTL fine mapping.
- Focusing on QIRs streamlines the process by concentrating resources on the most informative individuals.
- This approach is applicable for high-resolution mapping of QTL in various plant species.
