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Series GSE252092

Query DataSets for GSE252092

Status

Public on Jun 12, 2024

Title

The HMG-box module in FACT is critical for suppressing epigenetic variegation of heterochromatin in fission yeast

Organism

Schizosaccharomyces pombe

Experiment type

Expression profiling by array

Summary

Chromatin condensation state is the key for retrieving genetic information. High-mobility group protein (HMG) proteins exhibit DNA-binding and bending activities, playing an important role in the regulation of chromatin structure. We have shown that nucleosomes tightly packaged into heterochromatin undergo considerable dynamic histone H2A-H2B maintenance via the direct interaction between HP1/Swi6 and facilitate chromatin transcription (FACT), which is composed of the Spt16/Pob3 heterodimer and Nhp6. In this study, we analyzed the role of Nhp6, an HMG box protein, in the FACT at heterochromatin. Pob3 mutant strains showed derepressed heterochromatin-dependent gene silencing, whereas Nhp6 mutant strains did not show significant defects in chromatin regulation or gene expression, suggesting that these two modules play different roles in chromatin regulation. We expressed a protein fusing Nhp6 to the C-terminus of Pob3, which mimics the multicellular FACT component Ssrp1. The chromatin-binding activity of FACT increased with the number of Nhp6 fused to Pob3, and the heterochromatin formation rate was promoted more strongly. Furthermore, we demonstrated that this promotion of heterochromatinization inhibited the heterochromatic variegation caused by epe1+ disruption. Heterochromatic variegation can be observed in a variety of regulatory steps; however, when it is caused by fluctuations in chromatin arrangement, it can be eliminated through the strong recruitment of the FACT complex.

Overall design

Gene expression profile at exponentially-growing phase in the fission yeast deletion mutants of rhp6,pob3 and spt4.

Contributor(s)

Takahata S, Taguchi A, Takenaka A, Mori M, Chikashige Y, Tsutsumi C, Hiraoka Y, Murakami Y

Citation(s)

38837646

Submission date

Dec 27, 2023

Last update date

Jun 12, 2024

Contact name

Atsushi Matsuda