Tissue-specific Hi-C analyses of rice, foxtail millet and maize suggest non-canonical function of plant chromatin domains

Pengfei Dong, Xiaoyu Tu, Haoxuan Li, Jianhua ZHANG, Donald Grierson, Pinghua Li*, Silin Zhong

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

Chromatins are not randomly packaged in the nucleus and their organization plays important roles in transcription regulation, which is best studied in the mammalian models. Using in situ Hi-C, we have compared the 3D chromatin architectures of rice mesophyll and endosperm, foxtail millet bundle sheath and mesophyll, and maize bundle sheath, mesophyll and endosperm tissues. We found that their global A/B compartment partitions are stable across tissues, while local A/B compartment has tissue-specific dynamic associated with differential gene expression. Plant domains are largely stable across tissues, while new domain border formations are often associated with transcriptional activation in the region. Genes inside plant domains are not conserved across species, and lack significant co-expression behavior unlike those in mammalian TADs. Although we only observed chromatin loops between gene islands in the large genomes, the maize loop gene pairs’ syntenic orthologs have shorter physical distances in small genome monocots, suggesting that loops instead of domains might have conserved biological function. Our study showed that plants’ chromatin features might not have conserved biological functions as the mammalian ones.

Original languageEnglish
Pages (from-to)201-217
Number of pages17
JournalJournal of Integrative Plant Biology
Volume62
Issue number2
DOIs
Publication statusPublished - 1 Feb 2020

Scopus Subject Areas

  • Biochemistry
  • Biochemistry, Genetics and Molecular Biology(all)
  • Plant Science

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