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AtINO80 represses photomorphogenesis by modulating nucleosome density and H2A.Z incorporation in light-related genes.

Proc Natl Acad Sci U S A. 2020 Dec 29;117(52):33679-33688. Epub 2020 Dec 14
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摘要


Photomorphogenesis is a critical developmental process bridging light-regulated transcriptional reprogramming with morphological changes in organisms. Strikingly, the chromatin-based transcriptional control of photomorphogenesis remains poorly understood. Here, we show that the Arabidopsis (Arabidopsis thaliana) ortholog of ATP-dependent chromatin-remodeling factor AtINO80 represses plant photomorphogenesis. Loss of AtINO80 inhibited hypocotyl cell elongation and caused anthocyanin accumulation. Both light-induced genes and dark-induced genes were affected in the atino80 mutant. Genome-wide occupancy of the H2A.Z histone variant and levels of histone H3 were reduced in atino80 In particular, AtINO80 bound the gene body of ELONGATED HYPOCOTYL 5 (HY5), resulting in lower chromatin incorporations of H2A.Z and H3 at HY5 in atino80 Genetic analysis revealed that AtINO80 acts in a phytochrome B- and HY5-dependent manner in the regulation of photomorphogenesis. Together, our study elucidates a mechanism wherein AtINO80 modulates nucleosome density and H2A.Z incorporation and represses the transcription of light-related genes, such as HY5, to fine tune plant photomorphogenesis.

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