Homo sapiens
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA189444 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR719269.fastq.gz | Fastqsanger.gz | |||
| SRR719270.fastq.gz | Fastqsanger.gz | |||
| SRR719271.fastq.gz | Fastqsanger.gz | |||
| SRR719272.fastq.gz | Fastqsanger.gz | |||
| SRR719273.fastq.gz | Fastqsanger.gz |
Items per page: 5 1 - 5 of 12 |
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Project description:In Saccharomyces cerevisiae, a single double-strand break (DSB) triggers extensive phosphorylation of histone H2A (known as gammaH2AX) over 50 kb on either side of the DSB. This modification is carried out by either of yeastM-^Rs checkpoint kinases, the ATM homolog, Tel1, or the ATR homolog, Mec1. In G1-arrested cells, where there is very little 5M-^R to 3M-^R processing of DSB ends, only Tel1 promotes this modification. We have recently described a second modification gammaH2B - the phosphorylation of the C terminal T129 locus of histone H2B which is also carried out by both Mec1 and Tel1 kinases. To understand in detail how gamma-H2AX and gamma-H2B spread along the chromosome from a DSB we have undertaken a high-density analysis of their occupancy where there is a DSB on three different chromosomes. gamma-H2AX and gamma-H2B modifications are similar, but there is a marked absence of gamma-H2B near telomeres. We find that there is reduced gamma-H2AX and gamma-H2B modification over strongly transcribed regions, even taking into account the reduced histone occupancy of these genes. When transcription of the galactose-regulated genes GAL1, GAL10, GAL7 are turned off by the addition of glucose, gamma-H2AX is restored within 5 min; when these genes are again induced, gamma-H2AX is rapidly lost. Regions more distal to the GAL genes have markedly reduced gamma-H2AX levels that rise rapidly when transcription is repressed, suggesting that transcription acts as a barrier to the propagation of gamma-H2AX away from the DSB. The restoration of gamma-H2AX in transcribed regions can be carried out by either Mec1 or Tel1, even 7 h after break induction, suggesting that Tel1 remains associated with damaged chromosomes for an extended time. In addition, we show that gamma-H2AX can be transferred in trans, to regions unlinked to the DSB that lie in close proximity the DSB. Specifically, if a DSB is generated 14 kb from CEN2, gamma-H2AX is transferred to regions around all the other centromeres, in keeping with observed close proximity of all centromere-adjacent chromosome arms. This transfer can be observed even in the absence of formaldehyde crosslinking of the samples.
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Project description:Phosphorylation of the histone variant H2AX forms γ-H2AX, which serves as a marker of DNA repair response. Here we provide ChIP-seq-based maps of histone H2AX, γ-H2AX, H2AZ, INO80, SRCAP, and RNA polymerase II in activated T cells. Matched data for H2AX and γ-H2AX in resting T cells and Jurkat cancer T cells are available in GSE25577. CD4+ T cells were stimulated in two different ways (IL-2 alone or IL-2 plus anti-CD3 and anti-CD28), and H2AX, γ-H2AX, H2AZ, INO80, and SRCAP profiles were examined by ChIP-seq
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