Related Experiment Video
Updated: Aug 6, 2026
09:43
Breeding by Design for Functional Rice with Genome Editing Technologies
Published on: January 3, 2025
Breeding better crops: lessons from the homologous recombination pathway
Anastasia Kolesnikova1,2, Andrew Armitage3, Klara Hajdu4
1University of Kent, Giles Lane, Canterbury, Kent, CT2 7NZ, UK. ak5g21@soton.ac.uk.
Summary
Homologous recombination in plants controls DNA crossover events. Understanding this process and its protein network can help breeders enhance crop improvement by manipulating crossover frequencies for beneficial traits.
Area of Science:
- Plant genetics and molecular biology
- Reproductive biology
- Genomic recombination
Background:
- Homologous recombination facilitates DNA exchange during sexual reproduction, creating new genetic combinations.
- The number of crossover events is naturally limited in plants, impacting genetic diversity.
- Crop breeding currently operates within these natural crossover number constraints.
Purpose of the Study:
- To present a comprehensive protein network of homologous recombination in plants.
- To explore how understanding recombination mechanisms can optimize crop improvement.
- To assess current breeding practices related to recombination and discuss future technologies.
Main Methods:
- Compilation of existing research on plant homologous recombination.
- Analysis of protein-protein interactions involved in the recombination pathway.
- Review of breeding strategies and emerging technologies for manipulating crossover frequencies.
Main Results:
- A detailed protein network for plant homologous recombination is provided.
- The study highlights the potential for increased crossover events to generate novel phenotypes.
- Current crop breeding practices and their limitations regarding recombination are discussed.
Conclusions:
- Understanding the homologous recombination network is crucial for plant genetic improvement.
- Manipulating crossover frequencies offers a pathway to accelerate the development of beneficial crop traits.
- Future research should focus on leveraging this knowledge for enhanced crop breeding and adaptation.
Related Concept Videos
02:31Homologous Recombination
The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
02:31Homologous Recombination
The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
01:30Crossing Over
Crossing over is the exchange of genetic information between homologous chromosomes during prophase I of meiosis I. Genetic recombination gives rise to allelic diversity in the newly formed daughter cells. In humans, crossing over produces genetically distinct haploid egg and sperm cells that undergo fertilization to produce unique offspring. Before cell division starts, the germ cell’s chromosome(s) undergo duplication in the S phase of the cell cycle. As the cells enter prophase I, duplicated...
01:34Crossing Over
Unlike mitosis, meiosis aims for genetic diversity in its creation of haploid gametes. Dividing germ cells first begin this process in prophase I, where each chromosome—replicated in S phase—is now composed of two sister chromatids (identical copies) joined centrally.
The homologous pairs of sister chromosomes—one from the maternal and one from the paternal genome—then begin to align alongside each other lengthwise, matching corresponding DNA positions in a process called synapsis.
In order to...
The homologous pairs of sister chromosomes—one from the maternal and one from the paternal genome—then begin to align alongside each other lengthwise, matching corresponding DNA positions in a process called synapsis.
In order to...
02:08Gene Conversion
Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...
02:08Gene Conversion
Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...