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Unknown,Transcriptomics,Genomics,Proteomics

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Histone variant H2A.Bbd is associated with active transcription and mRNA processing in human cells

ABSTRACT: Variation in chromatin composition and organization often reflects differences in genome function. Histone variants, for example, replace canonical histones to contribute to regulation of numerous nuclear processes including transcription, DNA repair and chromosome segregation. Here we focus on H2A.Bbd, a rapidly evolving variant found in mammals but not in invertebrates. We report that in human cells, nucleosomes bearing H2A.Bbd form unconventional chromatin structures enriched within actively transcribed genes and characterized by shorter DNA protection and nucleosome spacing. Analysis of transcriptional profiles from cells depleted for H2A.Bbd demonstrated widespread changes in gene expression with a net down-regulation of transcription and disruption of normal mRNA splicing patterns. In particular, we observed changes in exon inclusion rates and increased presence of intronic sequences in mRNA products upon H2A.Bbd depletion. Taken together, our results indicate that H2A.Bbd is involved in formation of a specific chromatin structure that facilitates both transcription and initial mRNA processing. This SuperSeries is composed of the following subset Series: GSE38284: Histone variant H2A.Bbd is associated with active transcription and mRNA processing in human cells [ChIP-Seq] GSE38770: Histone variant H2A.Bbd is associated with active transcription and mRNA processing in human cells [RNA-Seq] GSE38890: Histone variant H2A.Bbd is associated with active transcription and mRNA processing in human cells [mRNA] Refer to individual Series

ORGANISM(S): Homo sapiens

SUBMITTER: Peter Park

PROVIDER: E-GEOD-38771 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Histone variant H2A.Bbd is associated with active transcription and mRNA processing in human cells [ChIP-Seq]

Project description:Variation in chromatin composition and organization often reflects differences in genome function. Histone variants, for example, replace canonical histones to contribute to regulation of numerous nuclear processes including transcription, DNA repair and chromosome segregation. Here we focus on H2A.Bbd, a rapidly evolving variant found in mammals but not in invertebrates. We report that in human cells, nucleosomes bearing H2A.Bbd form unconventional chromatin structures enriched within actively transcribed genes and characterized by shorter DNA protection and nucleosome spacing. Analysis of transcriptional profiles from cells depleted for H2A.Bbd demonstrated widespread changes in gene expression with a net down-regulation of transcription and disruption of normal mRNA splicing patterns. In particular, we observed changes in exon inclusion rates and increased presence of intronic sequences in mRNA products upon H2A.Bbd depletion. Taken together, our results indicate that H2A.Bbd is involved in formation of a specific chromatin structure that facilitates both transcription and initial mRNA processing. Nuclei were digested with Mnase and histone-DNA complexes were isolated with antibody.

2012-07-16 | E-GEOD-38284 | biostudies-arrayexpress

Histone variant H2A.Bbd is associated with active transcription and mRNA processing in human cells [RNA-Seq]

Project description:Variation in chromatin composition and organization often reflects differences in genome function. Histone variants, for example, replace canonical histones to contribute to regulation of numerous nuclear processes including transcription, DNA repair and chromosome segregation. Here we focus on H2A.Bbd, a rapidly evolving variant found in mammals but not in invertebrates. We report that in human cells, nucleosomes bearing H2A.Bbd form unconventional chromatin structures enriched within actively transcribed genes and characterized by shorter DNA protection and nucleosome spacing. Analysis of transcriptional profiles from cells depleted for H2A.Bbd demonstrated widespread changes in gene expression with a net down-regulation of transcription and disruption of normal mRNA splicing patterns. In particular, we observed changes in exon inclusion rates and increased presence of intronic sequences in mRNA products upon H2A.Bbd depletion. Taken together, our results indicate that H2A.Bbd is involved in formation of a specific chromatin structure that facilitates both transcription and initial mRNA processing. RNA-seq was used to examine changes in gene expression upon shRNA-assisted depletion of H2A.Bbd and H2A.Z histone variants in HeLa cells. The cells treated with shRNA with no homology to the human genome were used as control.

2012-07-16 | E-GEOD-38770 | biostudies-arrayexpress

Histone variant H2A.Bbd is associated with active transcription and mRNA processing in human cells [mRNA]

Project description:Variation in chromatin composition and organization often reflects differences in genome function. Histone variants, for example, replace canonical histones to contribute to regulation of numerous nuclear processes including transcription, DNA repair and chromosome segregation. Here we focus on H2A.Bbd, a rapidly evolving variant found in mammals but not in invertebrates. We report that in human cells, nucleosomes bearing H2A.Bbd form unconventional chromatin structures enriched within actively transcribed genes and characterized by shorter DNA protection and nucleosome spacing. Analysis of transcriptional profiles from cells depleted for H2A.Bbd demonstrated widespread changes in gene expression with a net down-regulation of transcription and disruption of normal mRNA splicing patterns. In particular, we observed changes in exon inclusion rates and increased presence of intronic sequences in mRNA products upon H2A.Bbd depletion. Taken together, our results indicate that H2A.Bbd is involved in formation of a specific chromatin structure that facilitates both transcription and initial mRNA processing. Gene expression was measured in two replicates of the HeLa cells expressing H2A.Bbd-FLAG histone, which were treated with shRNA with no homology to the human genome.

2012-07-15 | E-GEOD-38890 | biostudies-arrayexpress

Histone variant H2A.Bbd is associated with active transcription and mRNA processing in human cells [mRNA]

2012-07-16 | GSE38890 | GEO

Histone variant H2A.Bbd is associated with active transcription and mRNA processing in human cells [RNA-Seq]

2012-07-16 | GSE38770 | GEO

Histone variant H2A.Bbd is associated with active transcription and mRNA processing in human cells [ChIP-Seq]

2012-07-16 | GSE38284 | GEO

Histone variant H2A.Bbd is associated with active transcription and mRNA processing in human cells

Project description:Variation in chromatin composition and organization often reflects differences in genome function. Histone variants, for example, replace canonical histones to contribute to regulation of numerous nuclear processes including transcription, DNA repair and chromosome segregation. Here we focus on H2A.Bbd, a rapidly evolving variant found in mammals but not in invertebrates. We report that in human cells, nucleosomes bearing H2A.Bbd form unconventional chromatin structures enriched within actively transcribed genes and characterized by shorter DNA protection and nucleosome spacing. Analysis of transcriptional profiles from cells depleted for H2A.Bbd demonstrated widespread changes in gene expression with a net down-regulation of transcription and disruption of normal mRNA splicing patterns. In particular, we observed changes in exon inclusion rates and increased presence of intronic sequences in mRNA products upon H2A.Bbd depletion. Taken together, our results indicate that H2A.Bbd is involved in formation of a specific chromatin structure that facilitates both transcription and initial mRNA processing. This SuperSeries is composed of the SubSeries listed below.

2012-07-16 | GSE38771 | GEO

Homo sapiens

Project description:Histone variant H2A.Bbd is associated with active transcription and mRNA processing in human cells [mRNA]

| PRJNA169141 | ENA

Project description:Histone variant H2A.Bbd is associated with active transcription and mRNA processing in human cells

| PRJNA168645 | ENA

Genome-wide maps of chromatin state in NCCIT cells

Project description:H2B mono-ubiquitylation is required for multiple methylations of both H3K4 and H3K79 and has been implicated in gene expression from yeast to human. However, molecular crosstalk between H2BUb1 and other modifications, especially H3K4 and H3K79 methylations, remains unclear in vertebrates. To understand the functional role of H2BUb1, genome-wide histone modification patterns were measured in human cells. This study proposes dual roles of H2BUb1 that are both H3 methylation dependent and independent. First, H2BUb1 is a 5'-enriched active transcription mark and is co-occupied with H3K79 methylations in actively transcribed regions. Importantly, this study found a unique role of H2BUb1 in chromatin architecture independent of histone H3 methylations. H2BUb1 is well positioned in exon-intron boundaries of highly expressed exons and is specifically enriched in 5'-biased exons. Furthermore, H2BUb1 demonstrates increased occupancy in skipped exons compared to flanking exons for the human and mouse genome. Our findings suggest that a potentiating mechanism links H2BUb1 to both H3K79 methylations in actively transcribed regions and the exon-intron structure of highly expressed exons through the regulation of nucleosome dynamics during transcription elongation. We generated high-throughput sequencing (ChIP-seq) data for genome-wide occupancy of H2BUb1, nucleosome, H3K4me3, H3K36me3, H379me1/2/3, H3Ac, and mRNA in human embryonic carcinoma cells. We performed ChIP-seq for seven different histone modifications, MNase-seq, mRNA-seq (two replications), and inputDNA-seq in NCCIT cell lines (human embryonic carcinoma cell lines). We also performed mRNA-seq for RNF20-siRNA transfected NCCIT cells, where H2BUb1 signals decreased.

2012-03-07 | E-GEOD-25882 | biostudies-arrayexpress

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