Unknown,Transcriptomics,Genomics,Proteomics

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TET1 is a maintenance DNA demethylase that prevents methylation spreading in adult cells [DREAM]

ABSTRACT: We report that full length TET1 (TET1-FL) overexpression fails to induce global DNA demethylation in HEK293T cells. The preferential binding of TET1-FL to hypomethylated CpG islands (CGIs) through its CXXC domain leads to its inhibited 5-hydroxymethylcytosine (5hmC) production as methylation level increases. TET1-FL-induced 5hmC accumulates at CGI edges, while TET1 knockdown induces methylation spreading from methylated edges into hypomethylated CGIs. However, TET1 can regulate gene transcription independent of its dioxygenase catalytic function. Thus, our results identify TET1 as a maintenance DNA demethylase that does not purposely decrease methylation levels, but specifically maintains the DNA hypomethylation state of CGIs in adult cells. Digital restriction enzyme analysis of methylation (DREAM) was performed to determine the DNA methylation profiles of HEK293T cells overexpressing mTET1-CD, TET1-CD, mTET1-FL, or TET1-FL. In this approach, genomic DNA is sequentially cut at CCCGGG sites with the methylation sensitive enzyme SmaI (blunt ends) and its methylation-tolerant neoschizomer XmaI (5M-bM-^@M-^YCCGG overhangs), creating different end sequences that represent methylation status of the CCCGGG sites. These end sequences are analyzed by next generation sequencing, and thereafter the methylation status at individual CCCGGG sites across the genome can be determined.

ORGANISM(S): Homo sapiens

SUBMITTER: CHUNLEI JIN

PROVIDER: E-GEOD-44038 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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TET1 is a maintenance DNA demethylase that prevents methylation spreading in differentiated cells.

Jin Chunlei C Lu Yue Y Jelinek Jaroslav J Liang Shoudan S Estecio Marcos R H MR Barton Michelle Craig MC Issa Jean-Pierre J JP

Nucleic acids research 20140529 11

TET1 is a 5-methylcytosine dioxygenase and its DNA demethylating activity has been implicated in pluripotency and reprogramming. However, the precise role of TET1 in DNA methylation regulation outside of developmental reprogramming is still unclear. Here, we show that overexpression of the TET1 catalytic domain but not full length TET1 (TET1-FL) induces massive global DNA demethylation in differentiated cells. Genome-wide mapping reveals that 5-hydroxymethylcytosine production by TET1-FL is inhi ...[more]

PMID: 24875481

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Project description:We describe a simple method, Digital Restriction Enzyme Analysis of Methylation (DREAM), based on sequential DNA digestion with a pair of methylation-blocked and methylation-tolerant neoschizomeric restriction enzymes SmaI/XmaI followed by end repair and ultra-deep sequencing. DREAM provides information on 160,000 unique CpG sites of which 39,000 are in CpG islands, and 33,000 are at transcription start sites (-1 kb to +1 kb) of 13,139 RefSeq genes. We compared DNA methylation values in white blood cells from 4 healthy individuals and found them to be remarkably uniform. Interindividual differences >30% were observed only at 227 of 28,331 (0.8%) of autosomal CCCGGG sites covered by 100+ sequencing reads. Similarly, differences at only 59 sites were observed between the cord and adult blood. Conserved methylation patterns in healthy blood cells contrasted with extensive changes affecting 18-40% of CpG sites in leukemia. The method is cost effective, quantitative (r2=0.93 when compared to bisulfite pyrosequencing), reproducible (r2=0.997), and can detect differences >25% with false positive rate <0.001. Accurate analysis of changes in DNA methylation will be useful in quantifying epigenetic effects of environment and nutrition, correlating developmental epigenetic variation with phenotypes, understanding epigenetics of cancer and chronic diseases, measuring the effects of drugs on DNA methylation or deriving new biological insights into mammalian genomes. Digital restriction enzyme analysis of methylation (DREAM) was performed to determine the DNA methylation profiles of healthy white blood cells from cord blood and adult blood, acute myeloid leukemia bone marrow, and two leukemia cell lines (HEL and K562). In this approach, genomic DNA is sequentially cut at CCCGGG sites with the methylation-sensitive enzyme SmaI (blunt ends) and its methylation-tolerant neoschizomer XmaI (5'CCGG overhangs), creating different end sequences that represent methylation status of the CCCGGG sites. These end sequences are analyzed by next-generation sequencing, and thereafter the methylation status at individual CCCGGG sites across the genome can be determined.

Dataset Information

TET1 is a maintenance DNA demethylase that prevents methylation spreading in adult cells [DREAM]

Publications

TET1 is a maintenance DNA demethylase that prevents methylation spreading in differentiated cells.

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