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SVALKA-POLYCOMB REPRESSIVE COMPLEX2 module controls C-REPEAT BINDING FACTOR3 induction during cold acclimation.

Diego Gómez-Martínez1, Javier Barrero-Gil1, Eduardo Tranque1

  • 1Departamento de Biotecnología Microbiana y de Plantas, Centro de Investigaciones Biológicas Margarita Salas-CSIC, Ramiro de Maeztu 9, 28040 Madrid, Spain.

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|December 21, 2023
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Summary

Plant C-REPEAT BINDING FACTORS (CBFs) enhance cold tolerance. A new study reveals the Polycomb Repressive Complex 2 (PRC2) epigenetically silences CBF3 expression via H3K27me3, guided by SVALKA lncRNA, ensuring proper cold acclimation.

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Area of Science:

  • Plant molecular biology
  • Epigenetics
  • Plant abiotic stress response

Background:

  • C-REPEAT BINDING FACTORS (CBFs) are crucial transcription factors for plant cold tolerance.
  • CBF gene expression is rapidly induced during cold acclimation but mechanisms limiting their expression are unclear.
  • Understanding CBF regulation is vital for improving crop cold hardiness.

Purpose of the Study:

  • To investigate the molecular mechanisms that restrict CBF3 expression during cold acclimation.
  • To identify the role of epigenetic regulation in controlling CBF gene expression.
  • To elucidate the function of SVALKA and Polycomb Repressive Complex 2 (PRC2) in cold response.

Main Methods:

  • Genetic analysis of Arabidopsis thaliana mutants.
  • Molecular biology techniques including ChIP-seq for H3K27me3.
  • Analysis of long noncoding RNA (lncRNA) expression and function.

Main Results:

  • The decline in CBF3 induction during cold acclimation is epigenetically regulated by PRC2.
  • PRC2 deposits the repressive histone mark H3K27me3 at the CBF3 locus, leading to silencing.
  • The cold-inducible lncRNA SVALKA is essential for recruiting PRC2 to CBF3.

Conclusions:

  • A SVALKA-PRC2 regulatory module controls the precise timing of CBF3 expression during cold acclimation.
  • Epigenetic silencing via H3K27me3 is a key mechanism for terminating CBF3 induction.
  • This regulation ensures the proper development of the plant's cold adaptive response.