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Series GSE33233 Query DataSets for GSE33233
Status Public on Jun 13, 2012
Title DNA methylation differences between Newborns and Nonagenarians [PBMNC]
Organism Homo sapiens
Experiment type Methylation profiling by genome tiling array
Summary Human aging implies many phenotypic modifications and an increased susceptibility to many common diseases, phenomena that cannot be fully explained by the constrained genetic setting. An alternative pathway that could explain the age-associated alterations is epigenetic drifts. To address this issue, we performed Whole Genome Bisulfite Sequencing (WGBS) of a newborn and of a centenarian. The centenarian DNA exhibited a significant loss in DNA methylation and a poor correlation in the methylation status of neighboring CpGs throughout the genome. From a gene-regulatory region standpoint, we observed that the DNA hypomethylation events occurred mainly at CpG-poor promoters and in tissue-specific genes, whereas a greater level of DNA methylation was observed in CpG island promoters. Most importantly, we extended the study to a larger cohort of newborn and nonagenarian samples using a 450,000 CpG-site DNA methylation microarray. The 450K DNA methylation approach enabled validation of the WGBS data and revealed additional age-related DNA methylation events. Interestingly, we also observed the DNA methylation fingerprint characteristic of a healthy aged cell in samples from patients with premature-aging disorders such as Hutchinson-Gilford progeria and Werner syndrome. Overall, we suggest that defects in the physiological DNA methylation profile contribute to the process of human aging. As the disease associated cells were immortalized B cells, the effect of EBV immortalization was determined in advance to the study using immortalized and naive B cells.
Overall design DNA was quantified by Quant-iT PicoGreen dsDNA Reagent (Invitrogen) and the integrity was analyzed in a 1.3% agarose gel. Bisulfite conversion of 600 ng of each sample was perform according to the manufacturer's recommendation for Illumina Infinium Assay. Effective bisulphite conversion was checked for three controls that were converted simultaneously with the samples. 4 ul of bisulfite converted DNA were used to hybridize on Infinium HumanMethylation 450 BeadChip, following Illumina Infinium HD Methylation protocol. Chip analysis was performed using Illumina HiScan SQ fluorescent scanner. The intensities of the images are extracted using GenomeStudio (2010.3) Methylation module (1.8.5) software. Methylation score of each CpG is represented as beta value.
Contributor(s) Heyn HA, Esteller M
Citation(s) 22689993
Submission date Oct 26, 2011
Last update date Mar 22, 2019
Contact name Manel Esteller
Organization name IDIBELL
Department PEBC
Lab Cancer Epigenetics
Street address Hospital Duran i Reynals Av. Gran Via s/n km, 2.7
City L'Hospitalet de Llobregat
State/province Barcelona
ZIP/Postal code 08908
Country Spain
Platforms (1)
GPL13534 Illumina HumanMethylation450 BeadChip (HumanMethylation450_15017482)
Samples (19)
GSM822619 Middle_age_1
GSM822620 Middle_age_2
GSM822621 Middle_age_3
BioProject PRJNA156621

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
GSE33233_RAW.tar 183.1 Mb (http)(custom) TAR
GSE33233_signal_intensities.txt.gz 44.8 Mb (ftp)(http) TXT
Processed data included within Sample table

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