Analysis of Drosophila salivary glands and Kc cells with depleted levels of linker histone H1 [Affymetrix Expression]
Ontology highlight
ABSTRACT:
ORGANISM(S): Drosophila melanogaster
SUBMITTER: Sandeep Wontakal
PROVIDER: E-GEOD-44398 | biostudies-arrayexpress |
REPOSITORIES: biostudies-arrayexpress
Publications
Drosophila H1 regulates the genetic activity of heterochromatin by recruitment of Su(var)3-9.
Lu Xingwu X Wontakal Sandeep N SN Kavi Harsh H Kim Byung Ju BJ Guzzardo Paloma M PM Emelyanov Alexander V AV Xu Na N Hannon Gregory J GJ Zavadil Jiri J Fyodorov Dmitry V DV Skoultchi Arthur I AI
Science (New York, N.Y.) 20130401 6128
Eukaryotic genomes harbor transposable elements and other repetitive sequences that must be silenced. Small RNA interference pathways play a major role in their repression. Here, we reveal another mechanism for silencing these sequences in Drosophila. Depleting the linker histone H1 in vivo leads to strong activation of these elements. H1-mediated silencing occurs in combination with the heterochromatin-specific histone H3 lysine 9 methyltransferase Su(var)3-9. H1 physically interacts with Su(va ...[more]
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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.
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