The histone H3 variant H3.3 regulates gene body DNA methylation in Arabidopsis thaliana
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ABSTRACT:
ORGANISM(S): Arabidopsis thaliana
PROVIDER: GSE97252 | GEO | 2017/04/25
SECONDARY ACCESSION(S): PRJNA381084
REPOSITORIES: GEO
Similar Datasets
Project description:Gene bodies of vertebrates and flowering plants are occupied by histone variant H3.3 and DNA methylation. The origin and significance of these profiles remain largely unknown. The profiles of enrichments in DNA methylation and H3.3 over gene bodies are correlated and both depend similarly on gene transcription levels. This suggests a mechanistic link between H3.3 and gene body methylation. We engineered H3.3 knockdown in Arabidopsis and observed transcription reduction that predominantly affected genes responsive to environmental cues. When H3.3 levels were reduced, gene bodies showed a loss of DNA methylation correlated with transcription levels. To study the origin of changes in DNA methylation profiles when H3.3 levels are reduced, we examined genome wide distributions of several histone H3 marks, H2A.Z, linker histone H1 and nucleosome densities. We observed that in absence of H3.3, H1 distribution increased in gene bodies. This depends on levels of gene transcription. We propose that H3.3 prevents recruitment of H1, which in turn promotes chromatin folding and antagonizes access to DNA methyltransferases responsible for gene body methylation. Thus, gene body methylation is likely shaped by H3.3 dynamics in relation with transcriptional activity.
2017-04-24 | GSE97231 | GEO
Project description:Gene bodies of vertebrates and flowering plants are occupied by histone variant H3.3 and DNA methylation. The origin and significance of these profiles remain largely unknown. The profiles of enrichments in DNA methylation and H3.3 over gene bodies are correlated and both depend similarly on gene transcription levels. This suggests a mechanistic link between H3.3 and gene body methylation. We engineered H3.3 knockdown in Arabidopsis and observed transcription reduction that predominantly affected genes responsive to environmental cues. When H3.3 levels were reduced, gene bodies showed a loss of DNA methylation correlated with transcription levels. To study the origin of changes in DNA methylation profiles when H3.3 levels are reduced, we examined genome wide distributions of several histone H3 marks, H2A.Z, linker histone H1 and nucleosome densities. We observed that in absence of H3.3, H1 distribution increased in gene bodies. This depends on levels of gene transcription. We propose that H3.3 prevents recruitment of H1, which in turn promotes chromatin folding and antagonizes access to DNA methyltransferases responsible for gene body methylation. Thus, gene body methylation is likely shaped by H3.3 dynamics in relation with transcriptional activity.
2017-04-24 | GSE96834 | GEO
Project description:Gene bodies of vertebrates and flowering plants are occupied by histone variant H3.3 and DNA methylation. The origin and significance of these profiles remain largely unknown. The profiles of enrichments in DNA methylation and H3.3 over gene bodies are correlated and both depend similarly on gene transcription levels. This suggests a mechanistic link between H3.3 and gene body methylation. We engineered H3.3 knockdown in Arabidopsis and observed transcription reduction that predominantly affected genes responsive to environmental cues. When H3.3 levels were reduced, gene bodies showed a loss of DNA methylation correlated with transcription levels. To study the origin of changes in DNA methylation profiles when H3.3 levels are reduced, we examined genome wide distributions of several histone H3 marks, H2A.Z, linker histone H1 and nucleosome densities. We observed that in absence of H3.3, H1 distribution increased in gene bodies. This depends on levels of gene transcription.We propose that H3.3 prevents recruitment of H1, which in turn promotes chromatin folding and antagonizes access to DNA methyltransferases responsible for gene body methylation. Thus, gene body methylation is likely shaped by H3.3 dynamics in relation with transcriptional activity.
2017-04-24 | GSE95175 | GEO
Project description:Histone chaperones and chromatin remodelers control nucleosome dynamics, essential for transcription, replication, and DNA repair. The histone chaperone Anti-Silencing Factor 1 (ASF1) plays a central role in facilitating CAF-1-mediated replication-dependent H3.1 deposition and HIRA-mediated replication-independent H3.3 deposition in yeast and metazoans. Whether ASF1 function is evolutionarily conserved in plants is unknown. Here, we show that Arabidopsis ASF1 proteins display an exclusive preference for the H3.3-depositing HIRA complex. Simultaneous mutation of both Arabidopsis ASF1 genes caused a decrease in chromatin density and ectopic H3.1 occupancy at loci typically enriched with H3.3. Genetic, transcriptomic, and proteomic data indicate that ASF1 proteins strongly prefer the HIRA complex over CAF-1. asf1 mutants also displayed an increase in spurious Pol II transcriptional initiation, and showed defects in the maintenance of gene body CG DNA methylation and in the distribution of histone modifications. Furthermore, ectopic targeting of ASF1 caused excessive histone deposition, less accessible chromatin, and gene silencing. These findings reveal the importance of ASF1-mediated H3.3-H4 deposition via the HIRA pathway for proper epigenetic regulation of the genome.
2022-10-31 | PXD035578 | Pride
Project description:The histone H3 variant H3.3 regulates gene body DNA methylation
| PRJNA379965 | ENA
Project description:This SuperSeries is composed of the following subset Series: GSE16882: Histone H1 binding is restricted by histone variant H3.3 (Nucleosome) GSE16883: Histone H1 binding is restricted by histone variant H3.3 (DamID) GSE16884: Histone H1 binding is restricted by histone variant H3.3 (Expression) GSE19764: Histone H1 binding is restricted by histone variant H3.3 (FAIRE) Refer to individual Series
2009-10-15 | E-GEOD-16885 | biostudies-arrayexpress
Project description:Linker histones are involved in the formation of higher-order chromatin structure. Although linker histones have been implicated in the regulation of specific genes, it still remains unclear what their principal binding determinants are and how their repressive function in vitro can be reconciled with presumed broad binding in vivo. We generated a full genome, high resolution binding map of linker histone H1 in Drosophila Kc cells, using DamID. H1 binds at similar levels across much of the genome, both in classical euchromatin and heterochromatin. Strikingly, there are pronounced dips of low H1 occupancy around transcription start sites of active genes and at many distant cis-regulatory sites. H1 dips are not due to lack of nucleosomes. Rather, all regions with low binding of H1 show enrichment of the histone variant H3.3 which itself has been linked to high nucleosome turnover. Upon knockdown of H3.3, we find that H1 levels increase at sites previously not covered with H1 with a concomitant increase in nucleosome repeat length. These changes are independent of transcriptional changes. Our results show that the H3.3 protein counteracts association of H1 at genomic sites with high rates of histone turnover. This antagonism provides a mechanism to keep diverse genomic sites in an open chromatin conformation. For this study, we generated DamID profiles of histone H1 and RpII18 in Drosophila Kc167 cells. Additionally, we generated H1 profiles in cells treated with RNAi against white, H3.3B, or H3.3A and H3.3B. Nucleosome positioning profiles were generated in untreated cells and cells treated with RNAi against white, H3.3B, or H3.3A and H3.3B. Profiles of expression changes were generated for H3.3B RNAi and H3.3A and H3.3B RNAi. DamID experiments for H1 and RpII18 were performed in Drosophila cell cultures. Samples were hybridized to 380k NimbleGen arrays with 300 bp probe spacing. Formaldehyde-assisted isolation of regulatotry elements (FAIRE) was performed in Drosophila Kc167 cells. Samples were hybridized to 380k NimbleGen arrays with 300 bp probe spacing over non-crosslinked genomic DNA. Nucleosome positioning profiles were made by hybridizing mononucleosomal DNA over MNase digested purified genomic DNA on 380k NimbleGen arrays with 10 bp probe spacing. Expression profiles were made as H3.3 RNAi over white RNAi cohybridizations on spotted INDAC long oligo arrays. Every experiment was done in duplicate in the reverse dye orientation.
2010-06-21 | E-GEOD-16884 | biostudies-arrayexpress
Project description:Linker histones are involved in the formation of higher-order chromatin structure. Although linker histones have been implicated in the regulation of specific genes, it still remains unclear what their principal binding determinants are and how their repressive function in vitro can be reconciled with presumed broad binding in vivo. We generated a full genome, high resolution binding map of linker histone H1 in Drosophila Kc cells, using DamID. H1 binds at similar levels across much of the genome, both in classical euchromatin and heterochromatin. Strikingly, there are pronounced dips of low H1 occupancy around transcription start sites of active genes and at many distant cis-regulatory sites. H1 dips are not due to lack of nucleosomes. Rather, all regions with low binding of H1 show enrichment of the histone variant H3.3 which itself has been linked to high nucleosome turnover. Upon knockdown of H3.3, we find that H1 levels increase at sites previously not covered with H1 with a concomitant increase in nucleosome repeat length. These changes are independent of transcriptional changes. Our results show that the H3.3 protein counteracts association of H1 at genomic sites with high rates of histone turnover. This antagonism provides a mechanism to keep diverse genomic sites in an open chromatin conformation. For this study, we generated DamID profiles of histone H1 and RpII18 in Drosophila Kc167 cells. Additionally, we generated H1 profiles in cells treated with RNAi against white, H3.3B, or H3.3A and H3.3B. Nucleosome occupancy profiles were generated in untreated cells and cells treated with RNAi against white or H3.3A and H3.3B. Profiles of expression changes were generated for H3.3B RNAi and H3.3A and H3.3B RNAi. DamID experiments for H1 and RpII18 were performed in Drosophila cell cultures. Samples were hybridized to 380k NimbleGen arrays with 300 bp probe spacing. Formaldehyde-assisted isolation of regulatotry elements (FAIRE) was performed in Drosophila Kc167 cells. Samples were hybridized to 380k NimbleGen arrays with 300 bp probe spacing over non-crosslinked genomic DNA. Nucleosome positioning profiles were made by hybridizing mononucleosomal DNA over MNase digested purified genomic DNA on 380k NimbleGen arrays with 10 bp probe spacing. Expression profiles were made as H3.3 RNAi over white RNAi cohybridizations on spotted INDAC long oligo arrays. Every experiment was done in duplicate in the reverse dye orientation.
2010-06-23 | E-GEOD-16882 | biostudies-arrayexpress
Project description:Linker histones are involved in the formation of higher-order chromatin structure. Although linker histones have been implicated in the regulation of specific genes, it still remains unclear what their principal binding determinants are and how their repressive function in vitro can be reconciled with presumed broad binding in vivo. We generated a full genome, high resolution binding map of linker histone H1 in Drosophila Kc cells, using DamID. H1 binds at similar levels across much of the genome, both in classical euchromatin and heterochromatin. Strikingly, there are pronounced dips of low H1 occupancy around transcription start sites of active genes and at many distant cis-regulatory sites. H1 dips are not due to lack of nucleosomes. Rather, all regions with low binding of H1 show enrichment of the histone variant H3.3 which itself has been linked to high nucleosome turnover. Upon knockdown of H3.3, we find that H1 levels increase at sites previously not covered with H1 with a concomitant increase in nucleosome repeat length. These changes are independent of transcriptional changes. Our results show that the H3.3 protein counteracts association of H1 at genomic sites with high rates of histone turnover. This antagonism provides a mechanism to keep diverse genomic sites in an open chromatin conformation. For this study, we generated DamID profiles of histone H1 and RpII18 in Drosophila Kc167 cells. Additionally, we generated H1 profiles in cells treated with RNAi against white, H3.3B, or H3.3A and H3.3B. Nucleosome positioning profiles were generated in untreated cells and cells treated with RNAi against white, H3.3B, or H3.3A and H3.3B. Profiles of expression changes were generated for H3.3B RNAi and H3.3A and H3.3B RNAi. DamID experiments for H1 and RpII18 were performed in Drosophila cell cultures. Samples were hybridized to 380k NimbleGen arrays with 300 bp probe spacing. Formaldehyde-assisted isolation of regulatotry elements (FAIRE) was performed in Drosophila Kc167 cells. Samples were hybridized to 380k NimbleGen arrays with 300 bp probe spacing over non-crosslinked genomic DNA. Nucleosome positioning profiles were made by hybridizing mononucleosomal DNA over MNase digested purified genomic DNA on 380k NimbleGen arrays with 10 bp probe spacing. Expression profiles were made as H3.3 RNAi over white RNAi cohybridizations on spotted INDAC long oligo arrays. Every experiment was done in duplicate in the reverse dye orientation.
2010-06-21 | E-GEOD-16883 | biostudies-arrayexpress
Project description:Linker histones are involved in the formation of higher-order chromatin structure. Although linker histones have been implicated in the regulation of specific genes, it still remains unclear what their principal binding determinants are and how their repressive function in vitro can be reconciled with presumed broad binding in vivo. We generated a full genome, high resolution binding map of linker histone H1 in Drosophila Kc cells, using DamID. H1 binds at similar levels across much of the genome, both in classical euchromatin and heterochromatin. Strikingly, there are pronounced dips of low H1 occupancy around transcription start sites of active genes and at many distant cis-regulatory sites. H1 dips are not due to lack of nucleosomes. Rather, all regions with low binding of H1 show enrichment of the histone variant H3.3 which itself has been linked to high nucleosome turnover. Upon knockdown of H3.3, we find that H1 levels increase at sites previously not covered with H1 with a concomitant increase in nucleosome repeat length. These changes are independent of transcriptional changes. Our results show that the H3.3 protein counteracts association of H1 at genomic sites with high rates of histone turnover. This antagonism provides a mechanism to keep diverse genomic sites in an open chromatin conformation. For this study, we generated DamID profiles of histone H1 and RpII18 and a FAIRE profile in Drosophila Kc167 cells. Additionally, we generated H1 profiles in cells treated with RNAi against white, H3.3B, or H3.3A and H3.3B. Nucleosome positioning profiles were generated in untreated cells and cells treated with RNAi against white, H3.3B, or H3.3A and H3.3B. Profiles of expression changes were generated for H3.3B RNAi and H3.3A and H3.3B RNAi. DamID experiments for H1 and RpII18 were performed in Drosophila cell cultures. Samples were hybridized to 380k NimbleGen arrays with 300 bp probe spacing. Formaldehyde-assisted isolation of regulatotry elements (FAIRE) was performed in Drosophila Kc167 cells. Samples were hybridized to 380k NimbleGen arrays with 300 bp probe spacing over non-crosslinked genomic DNA. Nucleosome positioning profiles were made by hybridizing mononucleosomal DNA over MNase digested purified genomic DNA on 380k NimbleGen arrays with 10 bp probe spacing. Expression profiles were made as H3.3 RNAi over white RNAi cohybridizations on spotted INDAC long oligo arrays. Every experiment was done in duplicate in the reverse dye orientation.
2010-05-16 | E-GEOD-19764 | biostudies-arrayexpress