ArticleGenome biology2026
3D epigenome architecture orchestrates cis and trans regulation of flowering time in rice.
Article in Genome biology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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1 citing paper in PubMed.
- 3D epigenome architecture orchestrates cis and trans regulation of flowering time in rice.Genome biology · 2026Article
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24 authors.
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Abstract
backgroundTrimethylation of histone H3 lysine 27 (H3K27me3) confers a repressive chromatin state and is dynamically deposited and removed to regulate gene expression throughout plant growth and development. Nevertheless, the three-dimensional epigenome architecture linked to H3K27me3 and its regulatory role in controlling rice development remain unclear.
resultsHere, we employ long-read ChIA-PET to map the genome topology associated with H3K27me3 in rice, identifying hundreds of repressive chromatin spatial clusters within chromosomes. The T-DNA insertional mutagenesis of EMBRYONIC FLOWER 2b (OsEMF2b) leads to disruption of H3K27me3-associated chromatin interaction networks. Notably, we discover that the three key flowering time loci, Early heading date 1 (Ehd1) and Heading date 3a (Hd3a)/Rice Flowering Locus T1 (RFT1) form an inter-chromosomal repressive chromatin spatial cluster as a cis-interaction hub. Further investigation reveals that Ghd7, Ghd8, and Hd1 undergo liquid-liquid phase separation and bind to Ehd1-Hd3a/RFT1 repressive chromatin spatial cluster as trans flowering regulators.
conclusionOur findings elucidate a multi-dimensional topological framework of H3K27me3-associated loci in rice and identify a spatial flowering gene cluster regulated by the phase-separated repressor complex of Ghd7, Ghd8, and Hd1. These results expand our knowledge of the structural basis of the three-dimensional genome governing the transcriptional coordination of florigens in rice.
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