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Replacement of Arabidopsis H2A.Z with human H2A.Z orthologs reveals extensive functional conservation and limited importance of the N-terminal tail sequence for Arabidopsis development (ChIP-Seq)

ABSTRACT: Replacement of Arabidopsis H2A.Z with human H2A.Z orthologs reveals extensive functional conservation and limited importance of the N-terminal tail sequence for Arabidopsis development (ChIP-Seq)

PROVIDER: PRJNA1096696 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR28566017_1.fastq.gz	Fastqsanger.gz
	SRR28566017_2.fastq.gz	Fastqsanger.gz
	SRR28566018_1.fastq.gz	Fastqsanger.gz
	SRR28566018_2.fastq.gz	Fastqsanger.gz
	SRR28566019_1.fastq.gz	Fastqsanger.gz

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Replacement of Arabidopsis H2A.Z with human H2A.Z orthologs reveals extensive functional conservation and limited importance of the N-terminal tail sequence for Arabidopsis development (ChIP-Seq)

Project description:To investigate the functional conservation of H2A.Z histones during eukaryotic evolution we transformed h2a.z deficient plants with three human H2A.Z proteins to assess their ability to rescue the mutant defects. We discovered that human H2A.Z.1 and H2A.Z.2.1 fully complement the phenotypic abnormalities of h2a.z plants even though Arabidopsis and human H2A.Z N-terminal tail sequences are divergent, while the brain-specific splice variant H2A.Z.2.2 has a dominant-negative effect in wild-type plants. Furthermore, H2A.Z.1 almost completely re-establishes normal H2A.Z chromatin occupancy in h2a.z plants and restores the expression of more than 84 % of misexpressed genes. Finally, our hypothesis that the N-terminal tail of Arabidopsis H2A.Z is not crucial for its overall function was supported by the ability of N-terminal end truncations of Arabidopsis HTA11 to largely rescue the defects of h2a.z mutants.

2024-05-13 | GSE263312 | GEO

Replacement of Arabidopsis H2A.Z with human H2A.Z orthologs reveals extensive functional conservation and limited importance of the N-terminal tail sequence for Arabidopsis development (WT, h2a.z, h2a.z + AtHTA11 RNA-Seq)

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2024-05-13 | GSE263311 | GEO

Replacement of Arabidopsis H2A.Z with human H2A.Z orthologs reveals extensive functional conservation and limited importance of the N-terminal tail sequence for Arabidopsis development

Project description:Replacement of Arabidopsis H2A.Z with human H2A.Z orthologs reveals extensive functional conservation and limited importance of the N-terminal tail sequence for Arabidopsis development

| PRJNA1096687 | ENA

| PRJNA1096691 | ENA

| PRJNA1096692 | ENA

Replacement of Arabidopsis H2A.Z with human H2A.Z orthologs reveals extensive functional conservation and limited importance of the N-terminal tail sequence for Arabidopsis development

Project description:This SuperSeries is composed of the SubSeries listed below.

2024-05-13 | GSE263313 | GEO

Project description:In eukaryotes, DNA wraps around histones to form nucleosomes, which are compacted into chromatin. DNA-templated processes, including transcription, require chromatin disassembly and reassembly mediated by histone chaperones. Additionally, distinct histone variants can replace core histones to regulate chromatin structure and function. Although replacement of H2A with the evolutionarily conserved H2A.Z via the SWR1 histone chaperone complex has been extensively studied, in plants little is known about how a reduction of H2A.Z levels can be achieved. Here, we show that NRP proteins cause a decrease of H2A.Z-containing nucleosomes in Arabidopsis under standard growing conditions. nrp1-1 nrp2-2 double mutants show an over-accumulation of H2A.Z genome-wide, especially at heterochromatic regions normally H2A.Z-depleted in wild-type plants. Our work suggests that NRP proteins regulate gene expression by counteracting SWR1, thereby preventing excessive accumulation of H2A.Z.

2020-05-18 | PXD019248 | Pride

Stepwise histone replacement by SWR1 requires dual activation with histone H2A.Z and canonical nucleosome

Project description:Histone variant H2A.Z-containing nucleosomes are incorporated at most eukaryotic promoters. This incorporation is mediated by the conserved SWR1 complex, which replaces histone H2A in canonical nucleosomes with H2A.Z in an ATP-dependent manner. Here, we show that promoter-proximal nucleosomes are highly heterogeneous for H2A.Z in Saccharomyces cerevisiae, with substantial representation of nucleosomes containing one, two, or no H2A.Z molecules. SWR1-catalyzed H2A.Z replacement in vitro occurs in a stepwise and unidirectional fashion, one H2A.Z-H2B dimer at a time, producing heterotypic nucleosomes as intermediates and homotypic H2A.Z nucleosomes as end products. The ATPase activity of SWR1 is specifically stimulated by H2A-containing nucleosomes without ensuing histone H2A eviction. Remarkably, further addition of free H2A.Z-H2B dimer leads to hyperstimulation of ATPase activity, eviction of nucleosomal H2A-H2B and deposition of H2A.Z-H2B. These results suggest that the combination of H2A-containing nucleosome and free H2A.Z-H2B dimer acting as both effector and substrate for SWR1 governs the specificity and outcome of the replacement reaction. Total nucleosomes from MNase-treated nuclear extracts were fractionated by sequential immunoprecipitation into homotypic H2A/H2A (AA), heterotypic H2A/H2A.Z (AZ), and homotypic H2A.Z/H2A.Z (ZZ) nucleosomes.

2010-10-12 | E-GEOD-24618 | biostudies-arrayexpress

Stepwise histone replacement by SWR1 requires dual activation with histone H2A.Z and canonical nucleosome

2010-10-12 | GSE24618 | GEO