HY5 Interacts with the Histone Deacetylase HDA15 to Repress Hypocotyl Cell Elongation in Photomorphogenesis

May 8, 2019Plant physiology

HY5 works with HDA15 to slow stem cell growth during light-driven plant development

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Abstract

HY5 interacts with the histone deacetylase HDA15 to regulate hypocotyl cell elongation in Arabidopsis thaliana.

  • HDA15 acts as a negative regulator of hypocotyl cell elongation under red and far-red light conditions.
  • The enzymatic activity of HDA15 is necessary for inhibiting hypocotyl elongation.
  • HDA15 and HY5 work together to repress the expression of certain genes related to cell wall organization and auxin signaling.
  • Genome-wide transcriptome analysis indicates that HDA15 is essential for HY5's role in repressing hypocotyl elongation-related genes.
  • HY5 recruits HDA15 to target gene promoters, reducing histone H4 acetylation levels in response to light.

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