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Genome-Wide Analysis of the Rice PcG Gene Family and Its Involvement in Salt Response and Development
Ziang Shi1, Jun Cao2, Chuheng Li1
1State Key Laboratory of North China for Crop Improvement and Regulation, North China Key Laboratory for Crop Germplasm Resources of Education Ministry, Key Laboratory of Crop Germplasm Resources of Hebei Province, Hebei Agricultural University, Baoding 071001, China.
Plants (Basel, Switzerland)
|September 13, 2025
Summary
This study identified 15 Polycomb group (PcG) genes in rice, revealing OsPcG5
Area of Science:
- Plant molecular biology
- Epigenetics
- Genomics
Background:
- Polycomb group (PcG) proteins regulate gene silencing via epigenetic mechanisms, including Histone H3 lysine 27 trimethylation (H3K27me3) mediated by the Polycomb Repressive Complex 2 (PRC2).
- PcG proteins are vital for plant development and stress responses, but the rice PcG gene family remains underexplored.
Purpose of the Study:
- To systematically identify and characterize the PcG gene family in rice (Oryza sativa).
- To investigate the potential roles of PcG genes in response to abiotic stress, specifically salt stress.
- To explore the functional significance of PcG genes in rice development and chromatin modification.
Main Methods:
- Genome-wide identification and phylogenetic analysis of PcG genes in rice.
- Structural, conserved motif, collinearity, and Ka/Ks analyses for gene family characterization.
- Promoter element prediction, transcriptome analysis under salt stress, qRT-PCR, subcellular localization, and gene overexpression studies.
Main Results:
- Fifteen OsPcG genes were identified, distributed across 12 chromosomes, and classified into phylogenetic groups.
- Analyses indicated gene family expansion via segmental duplication under purifying selection, with conserved structures and motifs.
- OsPcG5 was identified as a salt-responsive gene, exhibiting dynamic expression and localization in the nucleus and plasma membrane.
- Overexpression of OsFIE2 (a PRC2 component) led to increased H3K27me3 levels and altered plant height, linking it to chromatin modification and development.
Conclusions:
- The study provides a comprehensive catalog of rice PcG genes and insights into their evolutionary history.
- OsPcG5 is a key regulator in response to salt stress, suggesting a role in epigenetic stress adaptation.
- These findings highlight the potential of PcG genes as targets for improving rice salt tolerance through epigenetic modifications.
Keywords:
Oryza sativaOsPcG genesPRC2 complexPolycomb group proteinschromatin modificationepigenetic regulationgene expressionsalt stressMore Related Videos
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