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<p>Histone post-translational modifications (PTMs) interact in complex ways to regulate chromatin structure and gene expression. To investigate this interplay, we analyze ChIP-seq and RNA-seq data from knock-out mutants lacking enzymes responsible for H3K4me2/3, H3K9me3, or H3K27me3 in the phytopathogenic fungus <i>Pyricularia oryzae</i>. Loss of specific PTMs alters other PTMs and gene expression in a compartment-specific manner, with distinct effects across H3K4me2-rich euchromatin (EC), H3K27me3-rich facultative heterochromatin (fHC), H3K9me3-rich constitutive heterochromatin (cHC), and centromeres. We identify two distinct fHC subcompartments: K4-fHC, adjacent to EC, and K9-fHC, adjacent to cHC. Both contain poorly conserved genes, but K9-fHC harbors more transposable elements, while K4-fHC is more enriched for genes upregulated during infection, including effector-like genes. H3K27me3 levels in K4-fHC respond to changes in other PTMs, especially H3K9me3, and to environmental conditions. These findings suggest that K4-fHC functions as a reservoir of genes highly responsive to chromatin context and environmental cues.</p>

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Analysis of histone modification interplay reveals two distinct domains in facultative heterochromatin in Pyricularia oryzae

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月22日

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  • Thach A. Dang,
  • Atsumi Morimoto,
  • Natsuki Kobayashi,
  • Kieu Pham,
  • Ken-ichi Ikeda,
  • Hitoshi Nakayashiki

摘要

Histone post-translational modifications (PTMs) interact in complex ways to regulate chromatin structure and gene expression. To investigate this interplay, we analyze ChIP-seq and RNA-seq data from knock-out mutants lacking enzymes responsible for H3K4me2/3, H3K9me3, or H3K27me3 in the phytopathogenic fungus Pyricularia oryzae. Loss of specific PTMs alters other PTMs and gene expression in a compartment-specific manner, with distinct effects across H3K4me2-rich euchromatin (EC), H3K27me3-rich facultative heterochromatin (fHC), H3K9me3-rich constitutive heterochromatin (cHC), and centromeres. We identify two distinct fHC subcompartments: K4-fHC, adjacent to EC, and K9-fHC, adjacent to cHC. Both contain poorly conserved genes, but K9-fHC harbors more transposable elements, while K4-fHC is more enriched for genes upregulated during infection, including effector-like genes. H3K27me3 levels in K4-fHC respond to changes in other PTMs, especially H3K9me3, and to environmental conditions. These findings suggest that K4-fHC functions as a reservoir of genes highly responsive to chromatin context and environmental cues.