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Updated: Jun 26, 2026
09:43
Breeding by Design for Functional Rice with Genome Editing Technologies
Published on: January 3, 2025
Expression diversity and evolutionary dynamics of rice duplicate genes
Won Cheol Yim1, Byung-Moo Lee, Cheol Seong Jang
1Department of Plant Biotechnology, Dongguk University, Seoul, 100-715, South Korea.
Molecular Genetics and Genomics : MGG
|February 3, 2009
Summary
Rice duplicate genes, formed by ancient polyploidization, show significant expression divergence, especially in metabolism. This supports evolutionary models of gene retention and functional innovation.
Area of Science:
- Genomics
- Evolutionary Biology
- Plant Science
Background:
- Duplicate genes are a primary driver of novel gene functions over evolutionary timescales.
- Gene duplication in rice, largely from paleopolyploidization before Poaceae family speciation, is crucial for understanding its evolutionary trajectory.
Purpose of the Study:
- To investigate the evolutionary dynamics and expression divergence of rice duplicate genes.
- To assess the impact of gene duplication on functional innovation and retention in rice.
Main Methods:
- Utilized a public microarray dataset comprising 155 Gene Expression Omnibus sample plates.
- Employed bioinformatics tools to analyze gene expression patterns and evolutionary metrics of rice duplicate genes.
Main Results:
- Over 57% of old (70 MYA) and 50% of young (7.7 MYA) duplicate gene pairs exhibited expression divergence.
- Metabolism-associated duplicate genes showed significant enrichment for divergence compared to non-divergent pairs.
- Conserved motif numbers declined with increasing expression diversity, supporting subfunctionalization with regulatory motif degeneration.
Conclusions:
- Rice duplicate genes display substantial expression divergence, contributing to functional innovation and retention.
- Evidence suggests subfunctionalization and regulatory motif degeneration play roles in the evolution of duplicate genes.
- High local similarity segments in duplicate genes correlate with higher expression correlation, potentially influencing gene conversion in regulatory regions.
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The seminal work of Ohno in 1970 popularized the idea of gene duplication and divergence. DNA sequence comparison studies reveal that a large portion of the genes in bacteria, archaebacteria, and eukaryotes was generated by gene duplication and divergence, indicating its critical role in evolution.
The duplicated copies of the gene are called Paralogs. Paralogs with similar sequences and functions form a gene family. Across several species, a large number of gene families are characterized.
The duplicated copies of the gene are called Paralogs. Paralogs with similar sequences and functions form a gene family. Across several species, a large number of gene families are characterized.
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Gene families consist of groups of genes proposed to have originated from a common ancestor. Typically these arise through events in which a gene or genes are mistakenly duplicated during cell division. Unlike their parent genes (which are subject to selection pressure to maintain function), these gene copies do not need to preserve their sequences and may evolve at a relatively faster rate.
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The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes.
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