Browse
Submit Data
Databases
API
Help

Dataset Information

0 Views

0 Connections

0 Citations

0 Reanalyses

0 Downloads

Omics score: 0

Bias in Gene-Set Analysis Applied to High-throughput Methylation Data

ABSTRACT: Gene set analysis as it is typically applied to genome-wide methylation assays is severely biased as a result of differences in the numbers and sizes of CpG islands associated with different classes of genes. We demonstrate this bias using published data from a study of differential methylation in lung cancer and a data set we generated to study methylation changes in patients with long-standing ulcerative colitis and show that several of the gene sets that appear enriched would also be identified with randomized data. We also report a method to correct the bias. Application of the corrected method to the lung cancer and ulcerative colitis data sets provides novel and potentially interesting biological insights into the role of methylation in cancer development and chronic inflammation.

ORGANISM(S): Homo sapiens

PROVIDER: GSE39188 | GEO | 2012/07/13

SECONDARY ACCESSION(S): PRJNA170467

REPOSITORIES: GEO

ACCESS DATA

Json Xml

Similar Datasets

Bias in Gene-Set Analysis Applied to High-throughput Methylation Data

Project description:Gene set analysis as it is typically applied to genome-wide methylation assays is severely biased as a result of differences in the numbers and sizes of CpG islands associated with different classes of genes. We demonstrate this bias using published data from a study of differential methylation in lung cancer and a data set we generated to study methylation changes in patients with long-standing ulcerative colitis and show that several of the gene sets that appear enriched would also be identified with randomized data. We also report a method to correct the bias. Application of the corrected method to the lung cancer and ulcerative colitis data sets provides novel and potentially interesting biological insights into the role of methylation in cancer development and chronic inflammation. We used Agilent Human CpG Island microarrays to compare methylation patterns in sigmoid colon tissue between five individuals suffering from ulcerative colitis and five healthy age-matched controls.

2012-07-12 | E-GEOD-39188 | biostudies-arrayexpress

DNA methylation in peripheral blood from individuals with Crohns' disease or ulcerative colitis and normal controls

Project description:Genome wide DNA methylation profiling of Crohn's disease, ulcerative colitis, and normal peripheral blood samples. The Illumina Infinium HumanMethylation450 BeadChip v1.1 was used to obtain DNA methylation profiles across 482,421 CpGs in peripheral blood samples. Samples came from 17 Crohn's disease affected, 11 ulcerative colitis affected, and 20 normal individuals. Within these samples were three twin sets discordant for Crohn's disease and three twin sets discordant for ulcerative colitis.

2012-04-05 | GSE32148 | GEO

DNA methylation in peripheral blood from individuals with Crohns' disease or ulcerative colitis and normal controls

2012-04-04 | E-GEOD-32148 | biostudies-arrayexpress

Establishment of epigenetic approach to identify high risk patients of colorectal cancer in ulcerative colitis

Project description:Primary outcome(s): Diagnostic accuracy of DNA methylation analysis for ulcerative colitis patients complicated with colorectal cancer using rectal mucosa from ulcerative colitis

| 2651254 | ecrin-mdr-crc

DNA methylation in a discovery cohort of colon mucosa samples from individuals with Crohns' disease or ulcerative colitis and normal controls

Project description:Genome wide DNA methylation profiling of Crohn's disease, ulcerative colitis, and normal colon mucosa samples. The Illumina Infinium HumanMethylation450 BeadChip v1.1 was used to obtain DNA methylation profiles across 482,421 CpGs in colon mucosa samples. Samples came from 10 Crohn's disease affected, 4 ulcerative colitis affected, and 10 normal individuals. One ulcerative colitis sample was assayed before and after treatment with 6-mercaptopurine and mesalamine.

2013-06-01 | GSE32146 | GEO

DNA methylation in a validation cohort of colon mucosa samples from individuals with Crohns' disease or ulcerative colitis and normal controls

Project description:Genome wide DNA methylation profiling of Crohn's disease, ulcerative colitis, and normal colon mucosa samples. The Illumina Infinium HumanMethylation450 BeadChip v1.1 was used to obtain DNA methylation profiles across 482,421 CpGs in colon mucosa samples. Samples came from 5 Crohn's disease affected, 5 ulcerative colitis affected, and 12 normal individuals. One ulcerative colitis sample was assayed before and after treatment with infliximab and mesalamine.

2015-01-01 | GSE42921 | GEO

IBD200: Multi-omics of IBD Severity Study

Project description:This study contains multiple -omic data sets. As a follow up to a study on 40 Ulcerative Colitis patients (MSV000082094), 210 fecal samples were analyzed through proteomics using Tandem Mass Tag (TMT) MS3 quantitation. Samples include both Ulcerative Colitis and Crohn's disease patients with healthy volunteers for context. Fecal samples were also analyzed by metabolomics through LCMS2 on a Bruker Maxis qTOF.

2020-11-23 | MSV000086509 | MassIVE

DNA methylation in colon mucosa samples from individuals with Crohns' disease or ulcerative colitis and normal controls

Project description:Genome wide DNA methylation profiling of Crohn's disease, ulcerative colitis, and normal colon mucosa samples. The Illumina Infinium HumanMethylation450 BeadChip v1.1 was used to obtain DNA methylation profiles across 482,421 CpGs in colon mucosa samples. Samples came from 9 Crohn's disease affected, 5 ulcerative colitis affected, and 10 normal individuals. Bisulfite converted DNA from the 24 samples were hybridized to the Illumina Infinium HumanMethylation450 BeadChip v1.1

2013-06-01 | E-GEOD-32146 | biostudies-arrayexpress

Genome-wide methylation approach identifies a novel hypermethylated gene panel in ulcerative colitis

Project description:Genome wide DNA methylation profiling of three normal (N) and eight ulcerative colitis (UC) samples as well as one human colon cancer cell (HCT116) . The Illumina Infinium 450k Human DNA methylation platform was used to obtain DNA methylation profiles across approximately 480,000 CpGs.

2017-02-11 | GSE81211 | GEO

Homo sapiens

Project description:Methylation profiling in Ulcerative colitis

| PRJNA138209 | ENA