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LATE-REPLICATING HETEROCHROMATIN IS CHARACTERISED BY DECREASED CYTOSINE METHYLATION IN THE HUMAN GENOME

ABSTRACT: This SuperSeries is composed of the SubSeries listed below.

ORGANISM(S): Homo sapiens

PROVIDER: GSE27538 | GEO | 2011/08/06

SECONDARY ACCESSION(S): PRJNA138555

REPOSITORIES: GEO

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LATE-REPLICATING HETEROCHROMATIN IS CHARACTERISED BY DECREASED CYTOSINE METHYLATION IN THE HUMAN GENOME

Project description:This SuperSeries is composed of the following subset Series: GSE27518: LATE-REPLICATING HETEROCHROMATIN IS CHARACTERISED BY DECREASED CYTOSINE METHYLATION IN THE HUMAN GENOME (expression) GSE27537: LATE-REPLICATING HETEROCHROMATIN IS CHARACTERISED BY DECREASED CYTOSINE METHYLATION IN THE HUMAN GENOME (HELP assay) Refer to individual Series

2011-08-05 | E-GEOD-27538 | biostudies-arrayexpress

LATE-REPLICATING HETEROCHROMATIN IS CHARACTERISED BY DECREASED CYTOSINE METHYLATION IN THE HUMAN GENOME (expression)

Project description:Heterochromatin is believed to be associated with increased levels of cytosine methylation. With the recent availability of genome-wide, high-resolution molecular data reflecting cytosine methylation or heterochromatic organization, such relationships can be explored systematically. As a well-defined surrogate for heterochromatin, we tested the relationship between DNA replication timing and cytosine methylation in two human cell types, unexpectedly finding that the later-replicating, more heterochromatic regions to be less methylated than early-replicating regions. When we integrated gene expression data into the study, we found that regions of increased gene expression were earlier replicating, as previously identified, and that transcription-targeted cytosine methylation (TTCM) in gene bodies accounts for the positive correlation with early replication. A Self-Organising Map (SOM) approach was able to identify genomic regions with early replication and increased methylation but lacking annotated transcripts, which would have been missed in simple two variable analyses and may encode unrecognized intergenic transcripts. We conclude that the relationship of cytosine methylation with heterochromatin is not simple, and depends on whether the genomic context is tandemly-repetitive sequences often found near centromeres, which are known to be heterochromatic and methylated, or the remaining majority of the genome, where cytosine methylation is targeted preferentially to the transcriptionally-active, euchromatic compartment of the genome.

2011-08-06 | GSE27518 | GEO

LATE-REPLICATING HETEROCHROMATIN IS CHARACTERISED BY DECREASED CYTOSINE METHYLATION IN THE HUMAN GENOME (expression)

2011-08-05 | E-GEOD-27518 | biostudies-arrayexpress

Late-replicating heterochromatin is characterized by decreased cytosine methylation in the human genome.

Project description:Heterochromatin is believed to be associated with increased levels of cytosine methylation. With the recent availability of genome-wide, high-resolution molecular data reflecting chromatin organization and methylation, such relationships can be explored systematically. As well-defined surrogates for heterochromatin, we tested the relationship between DNA replication timing and DNase hypersensitivity with cytosine methylation in two human cell types, unexpectedly finding the later-replicating, more heterochromatic regions to be less methylated than early replicating regions. When we integrated gene-expression data into the study, we found that regions of increased gene expression were earlier replicating, as previously identified, and that transcription-targeted cytosine methylation in gene bodies contributes to the positive correlation with early replication. A self-organizing map (SOM) approach was able to identify genomic regions with early replication and increased methylation, but lacking annotated transcripts, loci missed in simple two variable analyses, possibly encoding unrecognized intergenic transcripts. We conclude that the relationship of cytosine methylation with heterochromatin is not simple and depends on whether the genomic context is tandemly repetitive sequences often found near centromeres, which are known to be heterochromatic and methylated, or the remaining majority of the genome, where cytosine methylation is targeted preferentially to the transcriptionally active, euchromatic compartment of the genome.

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LATE-REPLICATING HETEROCHROMATIN IS CHARACTERISED BY DECREASED CYTOSINE METHYLATION IN THE HUMAN GENOME (HELP assay)

2011-08-06 | GSE27537 | GEO

Cell division drives DNA methylation loss in late-replicating domains in primary human cells

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

2022-07-25 | GSE197545 | GEO

Early-replicating heterochromatin.

Project description:Euchromatin, which has an open structure and is frequently transcribed, tends to replicate in early S phase. Heterochromatin, which is more condensed and rarely transcribed, usually replicates in late S phase. Here, we report significant deviation from this correlation in the fission yeast, Schizosaccharomyces pombe. We found that heterochromatic centromeres and silent mating-type cassettes replicate in early S phase. Only heterochromatic telomeres replicate in late S phase. Research in other laboratories has shown that occasionally other organisms also replicate some of their heterochromatin in early S phase. Thus, late replication is not an obligatory feature of heterochromatin.

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