Cell-type deconvolution in epigenome-wide association studies: a review and recommendations

Epigenomics
Andrew E Teschendorff, Shijie C Zheng

Abstract

A major challenge faced by epigenome-wide association studies (EWAS) is cell-type heterogeneity. As many EWAS have already demonstrated, adjusting for changes in cell-type composition can be critical when analyzing and interpreting findings from such studies. Because of their importance, a great number of different statistical algorithms, which adjust for cell-type composition, have been proposed. Some of the methods are 'reference based' in that they require a priori defined reference DNA methylation profiles of cell types that are present in the tissue of interest, while other algorithms are 'reference free.' At present, however, it is unclear how best to adjust for cell-type heterogeneity, as this may also largely depend on the type of tissue and phenotype being considered. Here, we provide a critical review of the major existing algorithms for correcting cell-type composition in the context of Illumina Infinium Methylation Beadarrays, with the aim of providing useful recommendations to the EWAS community.

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Methods Mentioned

BETA
WGBS
RNA-Seq

Software Mentioned

ISVA
EWASher
SVA
EWAS
RUVm
ReFACTor
RefFreeEWAS
CellMix
CIBERSORT
Blueprint

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