MTF2 and JARID2 function in ESC differentiation
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA656285 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR12424306_1.fastq.gz | Fastqsanger.gz | |||
| SRR12424306_2.fastq.gz | Fastqsanger.gz | |||
| SRR12424307_1.fastq.gz | Fastqsanger.gz | |||
| SRR12424307_2.fastq.gz | Fastqsanger.gz | |||
| SRR12424308_1.fastq.gz | Fastqsanger.gz |
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Project description:The Polycomb Group proteins foster gene repression profiles required for proper development and unimpaired adulthood, and comprise the components of the PRC2 complex including the histone H3 lysine 27 (H3K27) methyltransferase Ezh2. How mammalian PRC2 accesses chromatin is unclear. We find that Jarid2 associates with PRC2 and stimulates its enzymatic activity in vitro. Jarid2 contains a Jumonji C domain, but is devoid of detectable histone demethylase activity. Instead, its artificial recruitment to a promoter in vivo resulted in co-recruitment of PRC2 with resultant increased levels of H3K27me2/3. Jarid2 co-localizes with Ezh2 and MTF2, a homologue of Drosophila Pcl, at endogenous genes in ES cells. Jarid2 can itself bind DNA and its recruitment in ES cells is interdependent with that of PRC2 as Jarid2 knockdown reduced PRC2 at its target promoters, and ES cells devoid of the PRC2 component EED are deficient in Jarid2 promoter access. In addition to the well-documented defects in embryonic viability upon down-regulation of Jarid2, ES cell differentiation is impaired, as is Oct4 silencing. Examination of two factors in ES cells
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Project description:Polycomb repressive complex-2 (PRC2) is a group of proteins that play important role during development and in cell differentiation. PRC2 is a histone-modifying complex that catalyses methylation of lysine 27 of histone H3 (H3K27me3) at differentiation genes leading to their transcriptional repression. JARID2 is a co-factor of PRC2 and is important for targeting PRC2 to chromatin as well as modulating its activity. Here, we show that in many human cells, including human epidermal keratinocytes, JARID2 predominantly exists as a novel low molecular weight form, which lacks the N-terminal PRC2-interacting domain (ΔN-JARID2). We show that ΔN-JARID2 is a cleaved product of full-length JARID2 spanning the C-terminal conserved region consisting of jumonji domains. JARID2 knockout in keratinocytes results in up-regulation of cell cycle genes and repression of many epidermal differentiation genes. Surprisingly, repression of epidermal differentiation genes in JARID2-null keratinocytes can be relieved by expression of ΔN-JARID2 suggesting that this form promotes activation of these genes and has opposing function to that of PRC2 in regulation of differentiation. We propose that a switch from expression of full-length JARID2 to ΔN-JARID2 is important for the up-regulation of genes during differentiation.
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Project description:The Polycomb Group proteins foster gene repression profiles required for proper development and unimpaired adulthood, and comprise the components of the PRC2 complex including the histone H3 lysine 27 (H3K27) methyltransferase Ezh2. How mammalian PRC2 accesses chromatin is unclear. We find that Jarid2 associates with PRC2 and stimulates its enzymatic activity in vitro. Jarid2 contains a Jumonji C domain, but is devoid of detectable histone demethylase activity. Instead, its artificial recruitment to a promoter in vivo resulted in co-recruitment of PRC2 with resultant increased levels of H3K27me2/3. Jarid2 co-localizes with Ezh2 and MTF2, a homologue of Drosophila Pcl, at endogenous genes in ES cells. Jarid2 can itself bind DNA and its recruitment in ES cells is interdependent with that of PRC2 as Jarid2 knockdown reduced PRC2 at its target promoters, and ES cells devoid of the PRC2 component EED are deficient in Jarid2 promoter access. In addition to the well-documented defects in embryonic viability upon down-regulation of Jarid2, ES cell differentiation is impaired, as is Oct4 silencing.
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