Rapid reprogramming of epigenetic and transcriptional profiles in mammalian culture systems
Ontology highlight
ABSTRACT:
ORGANISM(S): Mus musculus
SUBMITTER: Colm Nestor
PROVIDER: E-MTAB-3176 | biostudies-arrayexpress |
REPOSITORIES: biostudies-arrayexpress
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Project description:Through the analysis of mouse liver tumours promoted by distinct routes (DEN exposure alone, DEN exposure plus non-genotoxic insult with phenobarbital and non-alcoholic fatty liver disease); we report that the cancer associated hyper-methylated CGI events in mice are also predicated by silent promoters that are enriched for both the DNA modification 5-hydroxymethylcytosine (5hmC) and the histone modification H3K27me3 in normal liver. During cancer progression these CGIs undergo hypo-hydroxymethylation, prior to subsequent hyper-methylation; whilst retaining H3K27me3. A similar loss of promoter-core 5hmC is observed in Tet1 deficient mouse livers indicating that reduced Tet1 binding at CGIs may be responsible for the epigenetic dysregulation observed during hepatocarcinogenesis. Consistent with this reduced Tet1 protein levels are observed in mouse liver tumour lesions. As in human, DNA methylation changes at CGIs do not appear to be direct drivers of hepatocellular carcinoma progression in mice. Instead dynamic changes in H3K27me3 promoter deposition are strongly associated with tumour-specific activation and repression of transcription. Our data suggests that loss of promoter associated 5hmC in diverse liver tumours licences DNA methylation reprogramming at silent CGIs during cancer progression. 5-mc is a well establisehd epigenetic mark typically related to gene silencing events. Phenobarbital (PB) is a well studied non-genotoxic carcinogen with roles in epigenetic perturbation. We profile 5mC in both control mouse livers as well as in the livers of 12 week PB treated mice. We also profile 5mC in liver tumours arising in the presence of long term PB exposure (35 week: resulting in Ctnnb1 mutated tumours) to a Ha-Ras liver tumour which arose without PB. Samples: 2 control and 2 PB exposed mouse livers, 3 liver tumours resulting from long term PB exposrue and 1 liver tumour arising without PB
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Project description:5-hmC is an epigenetic modification of the DNA base cytosine with roles in gene silencing events, imprinting and X inactivation. Phenobarbital (PB) is a well studied non-genotoxic carcinogen with roles in epigenetic perturbation. We profile 5hmC in both control mouse livers as well as in the livers of 1 day PB treated mice. 5hmC is largely found to reside in the bodies of active genes and promoter levels are perturbed upon PB induced gene activation events. 5-hmC is assocated with promoters fo silent genes. Upon PB exposire a handfull of genes are induced which reveal decreases in promoter 5hmC levels comparison of 5-hmC profiles in 5 control and 5 PB exposed mouse livers (dose: 1day PB)
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Project description:5-mC is an epigenetic modification of the DNA base cytosine with roles in gene silencing events, imprinting and X inactivation. Phenobarbital (PB) is a well studied non-genotoxic carcinogen with roles in epigenetic perturbation. We profile 5mC in both control mouse livers as well as in the livers of 91 day PB treated mice. 5mC is largely found to reside in the bodies of active genes and promoter levels are perturbed upon PB induced gene activation events. 5-mC is assocated with promoters fo silent genes. Upon PB exposire a handfull of genes are induced which reveal decreases in promoter 5mC levels comparison of 5-mC profiles in 5 control and 5 PB exposed mouse livers (dose: 91day PB)
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Project description:5-hmC is an epigenetic modification of the DNA base cytosine with roles in gene silencing events, imprinting and X inactivation. Phenobarbital (PB) is a well studied non-genotoxic carcinogen with roles in epigenetic perturbation. We profile 5hmC in both control mouse livers as well as in the livers of 91 day PB treated mice. 5hmC is largely found to reside in the bodies of active genes and promoter levels are perturbed upon PB induced gene activation events. 5-hmC is assocated with promoters fo silent genes. Upon PB exposire a handfull of genes are induced which reveal decreases in promoter 5hmC levels comparison of 5-hmC profiles in 5 control and 5 PB exposed mouse livers (dose: 91day PB)
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Project description:5-hmC is an epigenetic modification of the DNA base cytosine with roles in gene silencing events, imprinting and X inactivation. Phenobarbital (PB) is a well studied non-genotoxic carcinogen with roles in epigenetic perturbation. We profile 5hmC in both control mouse livers as well as in the livers of 7 day PB treated mice. 5hmC is largely found to reside in the bodies of active genes and promoter levels are perturbed upon PB induced gene activation events. 5-hmC is assocated with promoters fo silent genes. Upon PB exposire a handfull of genes are induced which reveal decreases in promoter 5hmC levels comparison of 5-hmC profiles in 5 control and 5 PB exposed mouse livers (dose: 7day PB)
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