Open AccessRemoving unwanted variation in a differential methylation analysis of Illumina HumanMethylation450 array data
Author(s) -
Jovana Maksimovic,
Johann A. Gag-Bartsch,
Terence P. Speed,
Alicia Oshlack
Publication year - 2015
Publication title -
nucleic acids research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 9.008
H-Index - 537
eISSN - 1362-4954
pISSN - 0305-1048
DOI - 10.1093/nar/gkv526
Subject(s) - biology , dna methylation , methylation , computational biology , variation (astronomy) , genetics , genome , gene , gene expression , physics , astrophysics
Due to their relatively low-cost per sample and broad, gene-centric coverage of CpGs across the human genome, Illumina's 450k arrays are widely used in large scale differential methylation studies. However, by their very nature, large studies are particularly susceptible to the effects of unwanted variation. The effects of unwanted variation have been extensively documented in gene expression array studies and numerous methods have been developed to mitigate these effects. However, there has been much less research focused on the appropriate methodology to use for accounting for unwanted variation in methylation array studies. Here we present a novel 2-stage approach using RUV-inverse in a differential methylation analysis of 450k data and show that it outperforms existing methods.