The DREAM complex represses growth in response to DNA damage in Arabidopsis

Life Sci Alliance. 2021 Sep 28;4(12):e202101141. doi: 10.26508/lsa.202101141. Print 2021 Dec.

Abstract

The DNA of all organisms is constantly damaged by physiological processes and environmental conditions. Upon persistent damage, plant growth and cell proliferation are reduced. Based on previous findings that RBR1, the only Arabidopsis homolog of the mammalian tumor suppressor gene retinoblastoma, plays a key role in the DNA damage response in plants, we unravel here the network of RBR1 interactors under DNA stress conditions. This led to the identification of homologs of every DREAM component in Arabidopsis, including previously not recognized homologs of LIN52. Interestingly, we also discovered NAC044, a mediator of DNA damage response in plants and close homolog of the major DNA damage regulator SOG1, to directly interact with RBR1 and the DREAM component LIN37B. Consistently, not only mutants in NAC044 but also the double mutant of the two LIN37 homologs and mutants for the DREAM component E2FB showed reduced sensitivities to DNA-damaging conditions. Our work indicates the existence of multiple DREAM complexes that work in conjunction with NAC044 to mediate growth arrest after DNA damage.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Arabidopsis / genetics*
  • Arabidopsis / growth & development*
  • Arabidopsis Proteins / genetics
  • Arabidopsis Proteins / metabolism*
  • Cell Cycle Checkpoints / genetics
  • DNA Damage / genetics*
  • DNA Repair / genetics
  • E2F Transcription Factors / genetics
  • E2F Transcription Factors / metabolism*
  • Gene Expression Regulation, Plant
  • Mutant Proteins / genetics
  • Mutant Proteins / metabolism*
  • Mutation
  • Plant Roots / genetics
  • Plant Roots / growth & development
  • Plants, Genetically Modified
  • Signal Transduction / genetics*
  • Trans-Activators / genetics
  • Trans-Activators / metabolism*
  • Transcription Factors / metabolism*

Substances

  • Arabidopsis Proteins
  • E2F Transcription Factors
  • E2Fb protein, Arabidopsis
  • Mutant Proteins
  • RBR1 protein, Arabidopsis
  • SOG1 protein, Arabidopsis
  • Trans-Activators
  • Transcription Factors