Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Methylation profiling of lung squamous cell carcinomas vs surrounding normal tissue

ABSTRACT: Methylated genomic fragments from tumor and matching normal DNA were enriched with the methylated-CpG island recovery assay (MIRA); amplified, labeled and hybridized on Agilent CpG island tiling oligo arrays. Samples from tumor were labeled with Cy5 while the matching normal were labeled with Cy3 so that methylation differences can be detected. Keywords: Cancer Comparison of methylation patterns between tumor and matching normal; five patients with stage I lung squamous cell carcinoma

ORGANISM(S): Homo sapiens

SUBMITTER: Tibor Rauch

PROVIDER: E-GEOD-9622 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

High-resolution mapping of DNA hypermethylation and hypomethylation in lung cancer.

Rauch Tibor A TA Zhong Xueyan X Wu Xiwei X Wang Melody M Kernstine Kemp H KH Wang Zunde Z Riggs Arthur D AD Pfeifer Gerd P GP

Proceedings of the National Academy of Sciences of the United States of America 20071227 1

Changes in DNA methylation patterns are an important characteristic of human cancer. Tumors have reduced levels of genomic DNA methylation and contain hypermethylated CpG islands, but the full extent and sequence context of DNA hypomethylation and hypermethylation is unknown. Here, we used methylated CpG island recovery assay-assisted high-resolution genomic tiling and CpG island arrays to analyze methylation patterns in lung squamous cell carcinomas and matched normal lung tissue. Normal tissue ...[more]

PMID: 18162535

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Project description:Using glutathione peroxidase, Gpx1 and Gpx2, double knockout (Gpx1/2-KO) mice as a model of inflammatory bowel disease predisposing to intestinal cancer, we analyzed genome-wide DNA methylation and chromatin changingM-bM-^@M-^Ys in the mouse ileum during chronic inflammation, aging and cancer. We found that inflammation leads to aberrant DNA methylation in Polycomb target genes, with 70% of the ~250 genes methylated in the inflamed tissue being PcG targets in embryonic stem cells and 58% of the methylated genes being marked by H3K27 trimethylation in the ileum of adult wildtype mice. Acquisition of DNA methylation at CpG islands in the ileum of Gpx-1/2-KO mice frequently correlated with loss of H3K27 trimethylation at the same loci. Inflammation-associated DNA methylation occurs preferentially in tissue-specific silent genes and, importantly, is much more frequently represented in tumors than is age-dependent DNA methylation. 60% of aberrant methylation found in tumors is also present in the inflamed tissue. In summary, inflammation creates a signature of aberrant DNA methylation, which is observed later in the malignant tissue and is directed by the PcG complex. In our study we used mice Gpx1/2-ko with B6 and B6.129 genetic background which are characterized by different level of inflammation in ileum and different tumor susceptibility. DNA methylation was analyzed by using MIRA-assisted Microarrays approach. Changing of the DNA methylation in intestinal epithelium during inflammation and tumorgenesis in Gpx1/2-KO mice were compared to healthy control mice with matching age. Aged dependent DNA methylation was study by comparing DNA methylation between 28-days-old healthy control mice with 8-month-old mice. To detect DKO-specific DNA methylation, we compared the changing DNA methylation in liver from Gpx1/2-KO mice with liver from control mice at age 28 days and 8 month. Association of the inflammation dependent DNA methylation with Polycomb targets and loss of H3K27me3 were verified by ChIp-on-ChIp experiments using H3K27me3 antibodies.

Dataset Information

Methylation profiling of lung squamous cell carcinomas vs surrounding normal tissue

Publications

High-resolution mapping of DNA hypermethylation and hypomethylation in lung cancer.

Similar Datasets

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