Jan 20, 2015

Functional normalization of 450k methylation array data improves replication in large cancer studies

Genome Biology
Jean-Philippe FortinKasper D Hansen

Abstract

We propose an extension to quantile normalization that removes unwanted technical variation using control probes. We adapt our algorithm, functional normalization, to the Illumina 450k methylation array and address the open problem of normalizing methylation data with global epigenetic changes, such as human cancers. Using data sets from The Cancer Genome Atlas and a large case-control study, we show that our algorithm outperforms all existing normalization methods with respect to replication of results between experiments, and yields robust results even in the presence of batch effects. Functional normalization can be applied to any microarray platform, provided suitable control probes are available.

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  • Citations113

Citations

Mentioned in this Paper

Protein Methylation
Neoplasms
DNA Methylation
Study of Epigenetics
Methylation
Microarray Platform
Cdna Microarrays
Malignant Neoplasms
Epigenesis, Genetic
Whole Genomic DNA Probes

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