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HD2B and HD2C interact with Argonaute 4 to promote tolerance and heterochromatin stabilization during heat stress [BS-Seq]

ABSTRACT: In this study, we show that HD2B/C work with AGO4 to promote heat tolerance

ORGANISM(S): Arabidopsis thaliana

PROVIDER: GSE212020 | GEO | 2023/08/12

REPOSITORIES: GEO

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HD2B and HD2C interact with Argonaute 4 to promote tolerance and heterochromatin stabilization during heat stress [ncRNA-Seq]

Project description:In this study, we show that HD2B/C work with AGO4 to promote heat tolerance

2023-08-12 | GSE212021 | GEO

HD2B and HD2C interact with Argonaute 4 to promote tolerance and heterochromatin stabilization during heat stress [RNA-Seq]

Project description:In this study, we show that HD2B/C work with AGO4 to promote heat tolerance

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HD2B and HD2C interact with Argonaute 4 to promote tolerance and heterochromatin stabilization during heat stress [ChIP-Seq]

Project description:In this study, we show that HD2B/C work with AGO4 to promote heat tolerance

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HD2B and HD2C interact with Argonaute 4 to promote tolerance and heterochromatin stabilization during heat stress

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

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Functional analysis of HD2C in Arabidopsis

Project description:Ribosome biogenesis is a fundamental process required for all cellular activities. Histone deacetylases play critical roles in many biological processes including transcriptional repression and rDNA silencing. However, their function in pre-rRNA processing remains poorly understood. Here, we discovered a previously uncharacterized role of Arabidopsis histone deacetylase HD2C in pre-rRNA processing via both canonical and non-canonical manners. HD2C interacts with HD2B and forms homo- and/or hetero-oligomers in the nucleolus. Depletion of HD2C and HD2B induces a ribosome biogenesis deficiency morphological phenotype and aberrant accumulation of 18S pre-rRNA intermediates. Our genome-wide analysis revealed that HD2C binds and represses the expression of key genes involved in ribosome biogenesis. Using RNA immunoprecipitation and sequencing, we further uncovered a non-canonical mechanism of HD2C directly associating with pre-rRNA and small nucleolar RNAs to regulate rRNA methylation. Together, this study reveals a multifaceted role of HD2C in ribosome biogenesis and provides mechanistic insights into how histone deacetylases modulate rRNA maturation at both transcriptional and post-transcriptional levels.

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Long non-coding RNA produced by RNA polymerase V determines boundaries of heterochromatin

Project description:We report genome-wide detection of long noncoding RNA (lncRNA) generate by Pol V in transcriptional gene silencing in Arabidopsis thaliana. We further show that most of these transcripts are bound by AGO4. RNA immunoprecipitation followed by high-throughput sequencing (RIP-seq) RNA immunoprecipitation with an anti-AGO4 antibody was performed in one biological replicate and included Col-0, nrpe1, and ago4-1; RNA immunoprecipitation with an anti-NRPE1 (largest subunit of Pol V) was performed in two replicates; replicate 1 included Col-0 and nrpe1, replicated two included Col-0, nrpe1, ago4-1, and idn2-1

2016-10-24 | E-GEOD-70290 | biostudies-arrayexpress

Distinct Functions of Argonaute Slicer in siRNA Maturation and Heterochromatin Formation.

Project description:Small-RNA (sRNA)-guided transcriptional gene silencing by Argonaute (Ago)-containing complexes is fundamental to genome integrity and epigenetic inheritance. The RNA cleavage ("Slicer") activity of Argonaute has been implicated in both sRNA maturation and target RNA cleavage. Typically, Argonaute slices and releases the passenger strand of duplex sRNA to generate active silencing complexes, but it remains unclear whether slicing of target nascent RNAs, or other RNAi components, also contributes to downstream transcriptional silencing. Here, we develop a strategy for loading the fission yeast Ago1 with a single-stranded sRNA guide, which bypasses the requirement for slicer activity in generation of active silencing complexes. We show that slicer-defective Ago1 can mediate secondary sRNA generation, H3K9 methylation, and silencing similar to or better than wild-type and associates with chromatin more efficiently. The results define an ancient and minimal sRNA-mediated chromatin silencing mechanism, which resembles the germline-specific sRNA-dependent transcriptional silencing pathways in Drosophila and mammals.

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Drosophila Argonaute-1 is critical for transcriptional cosuppression and heterochromatin formation.

Project description:Argonaute-1 (Ago-1) plays a crucial role in gene regulation and genome stability via biogenesis of small non-coding RNAs. Two "Argonaute" family genes, piwi and Ago-2 in Drosophila are involved in multiple silencing mechanisms in the nucleus, transgene cosuppression, long-distant chromosome interaction, nuclear organization and heterochromatin formation. To investigate whether Ago-1 also plays a similar role, we have generated a series of Ago-1 mutations by excising P element, inserted in the Ago-1 promoter (Ago-1k08121). AGO-1 protein is distributed uniformly in the nucleus and cytosol in early embryos but accumulated predominantly in the cytoplasm during the gastrulation stage. Repeat induced silencing produced by the mini-white (mw) array and transcriptional cosuppression of non-homologous transgenes Adh-w/w-Adh was disrupted by Ago-1 mutation. These effects of Ago-1 are distict from its role in microRNA processing because Dicer-1, a critical enzyme for miRNA biogenesis, has no role on the above silencing. Reduction of AGO-1 protein dislodged the POLYCOMB, EZ (enhancer of zeste) and H3me3K27 binding at the cosuppressed Adh-w transgene insertion sites suggesting its role in Polycomb dependent cosuppression. An overall reduction of methylated histone H3me2K9 and H3me3K27 from the polytene nuclei precisely from the mw promoters was also found that leads to concomitant changes in the chromatin structure. These results suggest a prominent role of Ago-1 in chromatin organization and transgene silencing and demonstrate a critical link between transcriptional transgene cosuppression, heterochromatin formation and chromatin organization. We propose Drosophila Ago-1 as a multifunctional RNAi component that interconnects at least two unrelated events, chromatin organization in the nucleus and microRNA processing in the cytoplasm, which may be extended to the other systems.

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RNA-dependent stabilization of SUV39H1 at constitutive heterochromatin.

Project description:Heterochromatin formed by the SUV39 histone methyltransferases represses transcription from repetitive DNA sequences and ensures genomic stability. How SUV39 enzymes localize to their target genomic loci remains unclear. Here, we demonstrate that chromatin-associated RNA contributes to the stable association of SUV39H1 with constitutive heterochromatin in human cells. We find that RNA associated with mitotic chromosomes is concentrated at pericentric heterochromatin, and is encoded, in part, by repetitive ?-satellite sequences, which are retained in cis at their transcription sites. Purified SUV39H1 directly binds nucleic acids through its chromodomain; and in cells, SUV39H1 associates with ?-satellite RNA transcripts. Furthermore, nucleic acid binding mutants destabilize the association of SUV39H1 with chromatin in mitotic and interphase cells - effects that can be recapitulated by RNase treatment or RNA polymerase inhibition - and cause defects in heterochromatin function. Collectively, our findings uncover a previously unrealized function for chromatin-associated RNA in regulating constitutive heterochromatin in human cells.

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Long non-coding RNA produced by RNA polymerase V determines boundaries of heterochromatin

2016-10-24 | GSE70290 | GEO