title: Removing unwanted variation in a differential methylation analysis of Illumina HumanMethylation450 array data.
abstract: 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.
authors.affiliation: Murdoch Childrens Research Institute, Royal Children's Hospital, Parkville, VIC 3052, Australia.
authors.forename: Jovana
authors.initials: J
authors.lastname: Maksimovic
authors.affiliation: Department of Statistics, University of California, Berkeley, CA 94705, USA.
authors.forename: Johann A
authors.initials: JA
authors.lastname: Gagnon-Bartsch
authors.affiliation: Bioinformatics Division, Walter and Eliza Hall Institute, Parkville, VIC 3052, Australia Department of Statistics, University of California, Berkeley, CA 94705, USA Department of Mathematics and Statistics, The University of Melbourne, VIC 3010, Australia terry@wehi.edu.au.
authors.forename: Terence P
authors.initials: TP
authors.lastname: Speed
authors.affiliation: Murdoch Childrens Research Institute, Royal Children's Hospital, Parkville, VIC 3052, Australia Department of Genetics, The University of Melbourne, VIC 3010, Australia alicia.oshlack@mcri.edu.au.
authors.forename: Alicia
authors.initials: A
authors.lastname: Oshlack
mesh_terms: D000293:Adolescent; D000369:Aged, 80 and over; D000375:Aging / Q000235:genetics; D019175:DNA Methylation; D005260:Female; D014644:Genetic Variation; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D009369:Neoplasms / Q000235:genetics; D020411:Oligonucleotide Array Sequence Analysis / Q000379:methods*; D012907:Smoking / Q000235:genetics