Browse
Submit Data
Databases
API
Help

Dataset Information

0 Views

0 Connections

0 Citations

0 Reanalyses

0 Downloads

Omics score: 0

S-adenosylhomocysteine hydrolase participates in DNA methylation inheritance

ABSTRACT: DNA (cytosine-5) methyltransferase 1 (DNMT1) is essential for mammalian development and maintenance of DNA methylation following DNA replication in cells. The DNA methylation process generates S-adenosyl-L-homocysteine, a strong inhibitor of DNMT1. Here we report that S-adenosylhomocysteine hydrolase (SAHH), the only mammalian enzyme capable of hydrolyzing S-adenosyl-L-homocysteine binds to DNMT1 during DNA replication. SAHH activates DNMT1 in vitro and its overexpression in mammalian cells leads to hypermethylation of the genome, whereas its inhibition by adenosine periodate resulted in hypomethylation of the genome. Hypermethylation was consistent in both gene bodies and repetitive DNA elements leading to both down- and up-regulation of genes. Similarly, hypomethylation led to both up- and down-regulation of genes suggesting methylated regions influence gene expression either positively or negatively. Cells overexpressing SAHH specifically up-regulated metabolic pathway genes and down-regulated PPAR and MAPK signaling pathways genes. Therefore, we suggest that alteration of SAHH level in the cell leads to aberrant DNA methylation, altered metabolite levels and gene expression.

ORGANISM(S): Homo sapiens

PROVIDER: GSE94055 | GEO | 2017/07/01

SECONDARY ACCESSION(S): PRJNA368713

REPOSITORIES: GEO

ACCESS DATA

Json Xml

Similar Datasets

S-adenosylhomocysteine hydrolase participates in DNA methylation inheritance

Project description:DNA (cytosine-5) methyltransferase 1 (DNMT1) is essential for mammalian development and maintenance of DNA methylation following DNA replication in cells. The DNA methylation process generates S-adenosyl-L-homocysteine, a strong inhibitor of DNMT1. Here we report that S-adenosylhomocysteine hydrolase (SAHH/AHCY), the only mammalian enzyme capable of hydrolyzing S-adenosyl-L-homocysteine binds to DNMT1 during DNA replication. SAHH activates DNMT1 in vitro and its overexpression in mammalian cells leads to hypermethylation of the genome, whereas its inhibition by adenosine periodate resulted in hypomethylation of the genome. Hypermethylation was consistent in both gene bodies and repetitive DNA elements leading to both down- and up-regulation of genes. Similarly, hypomethylation led to both up- and down-regulation of genes suggesting methylated regions influence gene expression either positively or negatively. Cells overexpressing SAHH specifically up-regulated metabolic pathway genes and down-regulated PPAR and MAPK signaling pathways genes. Therefore, we suggest that alteration of SAHH level in the cell leads to aberrant DNA methylation, altered metabolite levels and gene expression.

2018-06-06 | PXD006476 | Pride

A mutant DNMT1 enhances tumorigenicity with focal hypermethylation and global hypomethylation

Project description:Site-specific hypermethylation of tumor suppressor genes accompanied by genome-wide hypomethylation are epigenetic hallmarks of malignancy. However, molecular mechanisms that drive these linked changes in DNA methylation remain obscure. DNA methyltransferase 1 (DNMT1), the principle enzyme responsible for maintaining methylation patterns is commonly dysregulated in tumors. Replication foci targeting sequence (RFTS) is an N-terminal domain of DNMT1 that inhibits DNA-binding and catalytic activity, suggesting that RFTS deletion would result in gain of DNMT1 function. However, earlier data suggested that RFTS is required for DNMT1 activity. Here, we determined cellular consequences of RFTS deletion from DNMT1 in immortalized human bronchial epithelial cells. Compared to full-length DNMT1, ectopic expression of DNMT1- ?RFTS caused greater malignant transformation and enhanced promoter methylation that silenced DAPK and DUOX1 gene expression and increased intensity of promoter methylation across the genome. Strikingly, DNMT1-?RFTS also produced genomic hypomethylation and demethylation of Satellite 2 repeat sequences. Because deletion of RFTS is sufficient to induce focal hypermethylation and global hypomethylation in parallel, evidence suggests that the RFTS domain is a target responsible for epigenetic changes in cancer. DNA samples from HBEC3 cells transfected with vector control and HBEC3 cells with full-length and RFTS-deleted DNMT1 were assessed for genome-wide methylation using the microarray-based high resolution HpaII tiny fragment enriched by ligation-mediated PCR (HELP) assay.

2014-09-30 | E-GEOD-57829 | biostudies-arrayexpress

Small RNA mediated DNA (cytosine-5) methyltransferase 1 inhibition leads to aberrant DNA methylation

Project description:Mammalian cells contain copious amounts of RNA including both coding and non-coding RNA (ncRNA). Generally the ncRNAs function to regulate gene expression at the transcriptional and post-transcriptional level. Among ncRNA, the long ncRNA and small ncRNA can affect histone modification, DNA methylation targeting and gene silencing. Here we show that endogenous DNA methyltransferase 1 (DNMT1) co-purifies with inhibitory ncRNAs. MicroRNAs (miRNAs) binds directly to DNMT1 with high affinity. The binding of miRNAs, such as miR-155, leads to inhibition of DNMT1 enzyme activity. Exogenous miR-155 in cells induces aberrant DNA methylation of the genome, resulting in hypomethylation of low to moderately methylated regions. And small shift of hypermethylation of previously hypomethylated region was also observed. Furthermore, hypomethylation led to activation of genes. Based on these observations, we propose that overexpression of specific miRNAs in human cancer may lead to aberrant DNA methylation and altered gene-expression. Examine of the DNA methylation and mRNA profile of HCT 116 cells transfected by random 23-mer or miR-155 RNA

2015-04-21 | E-GEOD-68027 | biostudies-arrayexpress

RFTS-deleted DNMT1 enhances tumorigenicity with focal hypermethylation and global hypomethylation

Project description:Site-specific hypermethylation of tumor suppressor genes accompanied by genome-wide hypomethylation are epigenetic hallmarks of malignancy. However, molecular mechanisms that drive these linked changes in DNA methylation remain obscure. DNA methyltransferase 1 (DNMT1), the principle enzyme responsible for maintaining methylation patterns is commonly dysregulated in tumors. Replication foci targeting sequence (RFTS) is an N-terminal domain of DNMT1 that inhibits DNA-binding and catalytic activity, suggesting that RFTS deletion would result in gain of DNMT1 function. However, earlier data suggested that RFTS is required for DNMT1 activity. Here, we determined cellular consequences of RFTS deletion from DNMT1 in immortalized human bronchial epithelial cells. Compared to full-length DNMT1, ectopic expression of DNMT1- ΔRFTS caused greater malignant transformation and enhanced promoter methylation that silenced DAPK and DUOX1 gene expression and increased intensity of promoter methylation across the genome. Strikingly, DNMT1-ΔRFTS also produced genomic hypomethylation and demethylation of Satellite 2 repeat sequences. Because deletion of RFTS is sufficient to induce focal hypermethylation and global hypomethylation in parallel, evidence suggests that the RFTS domain is a target responsible for epigenetic changes in cancer.

2014-09-30 | GSE57829 | GEO

Small RNA mediated DNA (cytosine-5) methyltransferase 1 inhibition leads to aberrant DNA methylation

2015-04-21 | GSE68027 | GEO

Hydrogen sulfide mediated persulfidation regulates homocysteine metabolism and enhances ferroptosis in non-small-cell lung cancer

Project description:Ferroptosis, a novel form of regulated cell death triggered by the iron-dependent peroxidation of phospholipids, offers promising penitential for cancer therapy. Hydrogen sulfide (H2S), an endogenous metabolite of the transsulfuration pathway, has been implicated in ferroptosis. However, the precise regulatory mechanisms remain elusive. In this study, we systematically investigated the role of exogenous hydrogen sulfide in ferroptosis regulation in non-small-cell lung cancer (NSCLC). We demonstrated that H2S sensitizes NSCLC to ferroptosis both in vitro and in vivo. Mechanistically, hydrogen sulfide persulfurates the 195th cysteine residue of S-adenosyl homocysteine hydrolase (SAHH), thus impeding the binding of SAHH to its substrate S-adenosyl homocysteine (SAH). Consequently, this inhibition reduces SAHH activity, leading to a decreased homocysteine level. This reduction in homocysteine subsequently results in diminished levels of cysteine and glutathione, particularly under conditions of cystine depletion, which collectively potentiate the occurrence of ferroptosis. Together, our findings unveil H2S as pivotal regulator for homocysteine metabolism, increasing the sensitivity of NSCLC to ferroptosis. Importantly, these findings highlight its potential therapeutic value for enhancing ferroptosis-based cancer therapies for NCSCLC.

2023-12-04 | PXD047493 | iProX

Reversible SAHH inhibitor protects against glomerulonephritis in lupus-prone NZB/NZW F1 mice by modulating α-actinin-4 associated skeleton organization of podocytes

Project description:Glomerulonephritis is one of the major complications and causes of death in systemic lupus erythematosus (SLE). Podocytes can be injured in many forms of glomerular disease, characteristic changes are actin cytoskeleton reorganization of involved foot process. ACTN4, encodes α-actinin-4, an actin-binding and crosslinking protein localized to podocytes in renal glomerulus. Abnormal expression of α-actinin-4 in mice leads to proteinuria and podocyte damage. DZ2002, a reversible S-adenosyl-L-homocysteine hydrolase (SAHH) inhibitor with immunosuppressive properties and potent therapeutic activity against various autoimmune diseases in mice. Here, we found that DZ2002 could significantly ameliorate nephritis of lupus-prone mice. Our results showed that DZ2002 decreased the accumulation of α-actinin-4, inhibited expression of integrin-linked kinase and downstream phosphorylation of β1-integrin.

2019-11-12 | PXD010059 | Pride

Binding of 14-3-3 reader proteins to phosphorylated DNMT1 facilitates aberrant DNA methylation and gene expression

Project description:Mammalian DNA (cytosine-5) methyltransferase 1 (DNMT1) is essential for maintenance methylation. Phosphorylation of Ser143 (pSer143) stabilizes DNMT1 during DNA replication. Here, we show 14-3-3 is a reader protein of DNMT1pSer143. In mammalian cells 14-3-3 colocalizes and binds DNMT1pSer143 post-DNA replication. The level of DNMT1pSer143 increased with overexpression of 14-3-3 and decreased by its depletion. Binding of 14-3-3 proteins with DNMT1pSer143 resulted in inhibition of DNA methylation activity in vitro. In addition, overexpression of 14-3-3 in NIH3T3 cells led to decrease in DNMT1 specific activity and was rescued by transfection of DNMT1. Decrease in DNMT1 specific activity led to hypomethylation of the genome. Genes representing cell migration, mobility, proliferation and focal adhesion pathway were hypomethylated and overexpressed. Furthermore, 14-3-3 overexpression also resulted in enhanced cell invasion. Therefore, we suggest that 14-3-3 is a crucial reader of DNMT1pSer143 that regulates DNMT1 level, DNA methylation and altered gene expression that contributes to cell invasion. Examine of the DNA methylation and RNA expression profiles of stable NIH3T3 clones overexressing the 14-3-3ε homologue

2015-09-10 | E-GEOD-72860 | biostudies-arrayexpress

Binding of 14-3-3 reader proteins to phosphorylated DNMT1 facilitates aberrant DNA methylation and gene expression

2015-09-10 | GSE72860 | GEO

S-adenosylhomocysteine hydrolase regulates anterior patterning in Dugesia japonica

Project description:We report RNA-seq results from planarians of Dugesia japonica species which have developed resistance to a S-adenosyl homocysteine hydrolase inhibitor AdOx after prolonged exposure.

2021-11-01 | GSE155645 | GEO

OmicsDI is part of the ELIXIR infrastructure

OmicsDI is an Elixir interoperability service. Learn more ›

OmicsDI Databases

PRIDE
PeptideAtlas
MassIVE
JPOST Repository
Physiome Model Repository

EGA
EVA
ENA
LINCS
PAXDB
Cell Collective

MetaboLights
Metabolomics Workbench
MetabolomeExpress
GNPS
BioModels
FAIRDOMHub

ArrayExpress
dbGaP
ExpressionAtlas
GEO
NODE

Information

Databases
Help
API
Contact us
Code on GitHub
Terms of use
Submit Data