Chromatin reorganization accompanying cellular dedifferentiation is associated with modifications of histone H3, redistribution of HP1, and activation of E2F-target genes

Leor Williams, Jing Zhao, Nadya Morozova, Yan Li, Yigal Avivi, Gideon Grafi

Research output: Contribution to journalArticlepeer-review

87 Scopus citations

Abstract

The remarkable regeneration capacity of plant cells is based on their capability to dedifferentiate. We recently reported that cellular dedifferentiation proceeds through two distinct phases, each accompanied by chromatin decondensation: acquisition of competence for fate switch followed by a signal-dependent reentry into S phase (Zhao et al. [2001] J. Biol. Chem. 276:22772-22778). The purpose of this study was to (1) characterize changes in chromatin factors associated with chromatin decondensation, and (2) study the relationship between chromatin decondensation and transcriptional activation of pRb/E2F-regulated genes. We show that plant cells competent for fate switch display a disruption of nucleolar domain appearance associated with condensation of 18S ribosomal DNA, as well as modifications of histone H3 and redistribution of heterochromatin protein 1 (HP1). We further show that the pRb/ E2F-target genes RNR2 and PCNA are condensed and silent in differentiated leaf cells but become decondensed, although not yet activated, as cells acquire competence for fate switch; transcriptional activation becomes evident during progression into S phase, concomitantly with pRb phosphorylation. We propose that chromatin reorganization is central for reversion of the differentiation process leading to resetting of the gene expression program and activation of silent genes. Developmental Dynamics 228:113-120, 2003.

Original languageEnglish
Pages (from-to)113-120
Number of pages8
JournalDevelopmental Dynamics
Volume228
Issue number1
DOIs
StatePublished - 1 Sep 2003
Externally publishedYes

Keywords

  • Chromatin decondensation
  • Dedifferentiation
  • E2F-target genes
  • HP1
  • Histone H3
  • Plants
  • Regeneration
  • Retinoblastoma protein

ASJC Scopus subject areas

  • Developmental Biology

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