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SUV420H2 over-expression affects on gene expression in human breast cancer MDA-MB-231 cells

ABSTRACT: Analysis of breast cancer MDA-MB-231 cells stably over-expressing SUV420H2, a histone H4K20 methyltransferase. Several genes were significantly up- or down-regulated. Results provide insight into the molecular mechanism by which H4K20me3 contributes to gene expression.

ORGANISM(S): Homo sapiens

PROVIDER: GSE55947 | GEO | 2015/04/15

SECONDARY ACCESSION(S): PRJNA241445

REPOSITORIES: GEO

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SUV420H2 over-expression affects on gene expression in human breast cancer MDA-MB-231 cells

Project description:Analysis of breast cancer MDA-MB-231 cells stably over-expressing SUV420H2, a histone H4K20 methyltransferase. Several genes were significantly up- or down-regulated. Results provide insight into the molecular mechanism by which H4K20me3 contributes to gene expression. SUV420H2 stably over-expressing MDA-MB-231 cells were cloned. Then total RNA was extracted from the SUV420H2 over-expressing cells and the parental MDA-MB-231 cells.

2015-04-15 | E-GEOD-55947 | biostudies-arrayexpress

SUV420H2 over-expression affects on gene expression in human breast cancer MDA-MB-231 cells [MAA13355]

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SUV420H2 over-expression affects on gene expression in human breast cancer MDA-MB-231 cells [MAA13355]

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Loss of SUV420H2-dependent chromatin compaction drives right-sided colon cancer progression [CGH]

Project description:Epigenetic processes regulating gene expression contribute markedly to epithelial cell plasticity in colorectal carcinogenesis. The lysine methyltransferase SUV420H2 comprises an important regulator of epithelial plasticity and is primarily responsible for trimethylation of H4K20 (H4K20me3). Loss of H4K20me3 has been suggested as a hallmark of human cancer due to its interaction with DNMT1. However, the role of Suv4-20h2 in colorectal cancer is unknown.

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H4K20me3 methyltransferase SUV420H2 shapes the chromatin landscape of pluripotent embryonic stem cells

Project description:Heterochromatin, which is a densely packed chromatin state that is transcriptionally silent, is a critical regulator of gene expression. However, it is unclear how the repressive histone modification, H4K20me3, or the histone methyltransferase, SUV420H2, regulate embryonic stem (ES) cell fate by patterning the epigenetic landscape. Here, we report that depletion of SUV420H2 leads to a near complete loss of H4K20me3 genome-wide, dysregulated gene expression, and delayed ES cell differentiation. SUV420H2-bound regions are enriched with repetitive DNA elements, which are de-repressed in SUV420H2 knockout ES cells. Moreover, SUV420H2 regulation of H4K20me3-marked heterochromatin controls chromatin architecture, including fine-scale interactions between gene regulatory elements in pluripotent ES cells. SUV420H2 plays a critical role in stabilizing the three-dimensional (3D) chromatin landscape of ES cells, where loss of SUV420H2 results in A/B compartment switching, perturbed chromatin insulation, and altered chromatin interactions of pericentric heterochromatin, indicative of localized decondensation. In addition, depletion of SUV420H2 resulted in compromised interactions between H4K20me3 and gene regulatory regions. Together, these findings describe a novel role for SUV420H2 in regulating the chromatin landscape of ES cells.

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The Histone Methyltransferase SUV420H2 Regulates Brown and Beige Adipocyte Thermogenesis

Project description:Activation of brown adipose tissue (BAT) thermogenesis increases energy expenditure and alleviates obesity. Epigenetic regulation has emerged as a key mechanism underlying BAT development and function. To study the epigenetic regulation of BAT thermogenesis, we surveyed the expression of epigenetic enzymes that catalyze histone modifications in developmental beige adipocytes and found a unique expression pattern of suppressor of variegation 4-20 homolog 2 (Drosophila) (Suv420h2), a histone methyltransferase that preferentially catalyzes the tri-methylation at histone H4 lysine 20 (H4K20me3), a hallmark of gene silencing. Here we discovered that Suv420h2 expression parallels that of UCP1 expression in brown and beige adipocytes and that SUV420H2 knockdown significantly reduces, whereas SUV420H2 overexpression significantly increases UCP1 levels in brown adipocytes. Suv420h2 knockout (H2KO mice exhibit impaired cold-induced thermogenesis and are prone to diet-induced obesity. In contrast, mice with specific overexpression of Suv420h2 in adipocytes display enhanced cold-induced thermogenesis and are resistant to diet-induced obesity. Further study showed that Suv420h2 catalyzes H4K20 trimethylation at eukaryotic translation initiation factor 4E-binding protein 1 (4E-BP1) promoter, leading to down-regulated expression of 4E-BP1, a negative regulator of the translation initiation complex. This in turn up-regulates PGC1α protein levels, which is associated with increased expression of thermogenic program. We conclude that Suv420h2 is a key regulator of brown/beige adipocyte development and thermogenesis.

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H4K20me3 methyltransferase SUV420H2 regulates pluripotent embryonic stem cells [ChIP-seq]

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