Knockdown of HP1γ in H1792 cells
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ABSTRACT:
PROVIDER: PRJNA436586 | ENA |
REPOSITORIES: ENA
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Project description:For analysis of genes regulated by HP1γ in LUAD, we used microarray analysis to determine the global changes in gene expression upon HP1γ knockdown in H1792 cells and identified distinct sets of up-regulated and down-regulated genes upon depletion of HP1γ.
2018-11-13 | GSE111321 | GEO
Project description:The heterochromatin protein 1 (HP1) family members are canonical effectors and propagators of gene repression mediated by histone H3 lysine 9 (H3K9) methylation. HP1γ exhibits an increased interaction with active transcription elongation-associated factors in embryonic stem cells (ESCs) compared to somatic cells. However, whether this association has a functional consequence remains elusive. Here we find that genic HP1γ colocalizes and enhances enrichment of transcription elongation-associated H3K36me3 rather than H3K9me3. Unexpectedly, sustained H3K36me3 deposition is dependent on HP1γ. HP1γ-deleted ESCs display reduced H3K36me3 enrichment, concomitant with decreased expression at shared genes which function to maintain cellular homeostasis. Both the H3K9me3-binding chromodomain and histone binding ability of HP1γ are dispensable for maintaining H3K36me3 levels. Instead, the chromoshadow together with the hinge domain of HP1γ that confer protein and nucleic acid-binding ability are sufficient because they retain the ability to interact with NSD1, an H3K36 methyltransferase. HP1γ-deleted ESCs have a slower self-renewal rate and an impaired ability to differentiate towards cardiac mesoderm. Our findings reveal a requirement for HP1γ in faithful establishment of transcription elongation in ESCs, which regulates pluripotency.
2020-11-01 | GSE144861 | GEO
Project description:The heterochromatin protein 1 (HP1) family members are canonical effectors and propagators of gene repression mediated by histone H3 lysine 9 (H3K9) methylation. HP1γ exhibits an increased interaction with active transcription elongation-associated factors in embryonic stem cells (ESCs) compared to somatic cells. However, whether this association has a functional consequence remains elusive. Here we find that genic HP1γ colocalizes and enhances enrichment of transcription elongation-associated H3K36me3 rather than H3K9me3. Unexpectedly, sustained H3K36me3 deposition is dependent on HP1γ. HP1γ-deleted ESCs display reduced H3K36me3 enrichment, concomitant with decreased expression at shared genes which function to maintain cellular homeostasis. Both the H3K9me3-binding chromodomain and histone binding ability of HP1γ are dispensable for maintaining H3K36me3 levels. Instead, the chromoshadow together with the hinge domain of HP1γ that confer protein and nucleic acid-binding ability are sufficient because they retain the ability to interact with NSD1, an H3K36 methyltransferase. HP1γ-deleted ESCs have a slower self-renewal rate and an impaired ability to differentiate towards cardiac mesoderm. Our findings reveal a requirement for HP1γ in faithful establishment of transcription elongation in ESCs, which regulates pluripotency.
2020-11-01 | GSE144862 | GEO
Project description:Telomeric Repeat-containing RNA are long non-coding RNAs generated from the telomeres. TERRAs are essential for the establishment of heterochromatin marks at telomeres, which serve for the binding of members of the Heterochromatin Protein 1protein family of epigenetic modifiers involved with chromatin compaction and gene silencing. While HP1γ is enriched on gene bodies of actively transcribed mammalian genes, it is unclear if its transcriptional role is important for HP1γ function in telomere cohesion and telomere maintenance. We aimed to study the effect of mouse HP1γ on the transcription of telomere factors and molecules that can affect telomere maintenance. We investigated the telomere function of HP1γ by using HP1γ deficient mouse embryonic fibroblastsderiving from 13.5 embryonic day embryos compared to their littermate controls. We used gene expression analysis of HP1γ deficient MEFs and validated the molecular and mechanistic consequences of HP1γ loss by telomere FISH, immunofluorescence, RT-qPCR and DNA-RNA Immunoprecipitation. Loss of HP1γ in primary MEFs led to a downregulation of various telomere and telomere-accessory transcripts, including the shelterin protein TRF1. Its downregulation is associated with increased telomere replication stress and DNA damage (γH2AX), effects more profound in females. We suggest that the source for the impaired telomere maintenance is a consequence of increased telomeric DNARNA hybrids and TERRAs arising at and from mouse chromosomes 18 and X. Our results suggest an important transcriptional control by mouse HP1γ of various telomere factors including TRF1 protein and TERRAs that has profound consequences on telomere stability, with a potential sexually dimorphic nature.
2023-08-19 | GSE240434 | GEO
Project description:Cancer development is complicated, it invloves a series of gene expression change. As demonstrated in several reports, HP1γ is upregulated in some types of cancer, and it is essential for cancer development.We want to further clarify HP1γ function in bladder cancer. We used microarrays to determine the gene expression profile in bladder cancer cell line T24 with depletion of HP1γ.
2020-02-20 | GSE95400 | GEO
Project description:HP1γ regulates H3K36 methylation and pluripotency in embryonic stem cells
| PRJNA605165 | ENA
Project description:Using a genome-wide analysis, we demonstrated that HP1γ is selectively required for GC-regulated expression of GR target genes that require G9a and GLP, consistent with our previous finding that automethylated G9a and GLP recruit HP1g to specific genomic GR binding sites.
2018-10-18 | GSE117796 | GEO
Project description:HP1γ regulates H3K36 methylation and pluripotency in embryonic stem cells (ChIP-Seq)
| PRJNA605172 | ENA
Project description:HP1γ regulates H3K36 methylation and pluripotency in embryonic stem cells (RNA-seq)
| PRJNA605171 | ENA
Project description:Temporal and spatial regulation of trimethylation of histone H3 lysine27 (H3K27me3) is crucial for cell lineage commitment and development. Resetting the ground state of H3K27me3 is important for establishing a proper development program of primordial germ cells (PGCs). The mechanisms that regulate global erasure of epigenetic information in the germ line are not well understood. Here we show that HP1γ suppresses the demethylation activity of Utx through direct interaction in vitro and in vivo. Down-regulation of mammalian heterochromatin protein 1 gamma (HP1γ) coincides with transient loss of H3K27me3 in PGCs on Embryonic Day 10.5 (E10.5). Furthermore, transient abolishment of HP1γ promotes the induction of embryonic stem cells into putative PGCs in vitro. These data reveal a cross-talk between HP1γ and Utx in controlling histone H3K27 methylation status, thereby define HP1γ as a molecular regulator of germ cell epigenetic reprogramming.
2017-01-24 | GSE93924 | GEO