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Series GSE70090 Query DataSets for GSE70090
Status Public on Oct 05, 2016
Title Whole genome analysis of the methylome and hydroxymethylome in normal and malignant lung and liver [oxBS-Seq and BS-Seq]
Organism Homo sapiens
Experiment type Methylation profiling by high throughput sequencing
Summary DNA methylation at the 5-postion of cytosine (5mC) is a well-established epigenetic modification which regulates gene expression and cellular plasticity in development and disease. The ten-eleven translocation (TET) gene family is able to oxidize 5mC to 5-hydroxmethylcytosine (5hmC), providing an active mechanism for DNA demethylation, and may also provide its own regulatory function. Here we applied oxidative bisulfite sequencing to generate whole-genome DNA methylation and hydroxymethylation maps at single-base resolution in paired human liver and lung normal and cancer. We found that 5hmC is significantly enriched in CpG island (CGI) shores while depleted in CGS themselves, in particular at active genes, resulting in a 5hmC but not 5mC bimodal distribution around CGI corresponding to H3K4me1 marks. Hydroxymethylation on promoters, gene bodies, and transcription termination regions showed strong positive correlation with gene expression within and across tissues, suggesting that 5hmC is a mark of active genes and could play a role gene expression mediated by DNA demethylation. Comparative analysis of methylomes and hydroxymethylomes at differentially methylated regions (DMRs) revealed that 5hmC is significantly enriched in both tissue specific DMRs (t-DMRs) and cancer specific DMRs (c-DMRs), and 5hmC is negatively correlated with methylation changes, particularly in non-CGI associated DMRs. Analysis of differentially methylated regions (DMRs) in normal and tumor tissues revealed that gain or loss of 5hmC negatively correlated with changes in 5mC, especially on non-CGI associated DMRs, suggesting a profound role for hydroxymethylation in regulation of dynamic DNA demethylation. Together these findings indicate that changes in 5mC as well as in 5hmC and coupled to H3K4me1 correspond to differential gene expression in tissues and matching tumors, revealing an intricate gene expression regulation through interplay of methylome, hydroxymethylome, and histone modifications.
Overall design To explore 5-hydroxymethylation landscape between human normal and tumor tissues
Contributor(s) Li X, Liu Y, Feinberg AP
Citation(s) 27737935
Submission date Jun 22, 2015
Last update date May 15, 2019
Contact name Xin Li
Organization name Sun Yat-sen University
Department School of Medicine
Street address 132 Daxuecheng Outer Ring E Rd
City Guangzhou
State/province Guangdong
ZIP/Postal code 510006
Country China
Platforms (1)
GPL11154 Illumina HiSeq 2000 (Homo sapiens)
Samples (28)
GSM1716957 liver_N1_BS
GSM1716958 liver_N1_oxBS
GSM1716959 liver_T1_BS
This SubSeries is part of SuperSeries:
GSE70091 Whole genome analysis of the methylome and hydroxymethylome in normal and malignant lung and liver
BioProject PRJNA287622
SRA SRP059772

Download family Format
SOFT formatted family file(s) SOFTHelp
MINiML formatted family file(s) MINiMLHelp
Series Matrix File(s) TXTHelp

Supplementary file Size Download File type/resource
GSE70090_RAW.tar 3.5 Gb (http)(custom) TAR (of TXT)
SRA Run SelectorHelp
Raw data are available in SRA
Processed data are available on Series record

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