title: Sequence-level mechanisms of human epigenome evolution.
abstract: DNA methylation and chromatin states play key roles in development and disease. However, the extent of recent evolutionary divergence in the human epigenome and the influential factors that have shaped it are poorly understood. To determine the links between genome sequence and human epigenome evolution, we examined the divergence of DNA methylation and chromatin states following segmental duplication events in the human lineage. Chromatin and DNA methylation states were found to have been generally well conserved following a duplication event, with the evolution of the epigenome largely uncoupled from the total number of genetic changes in the surrounding DNA sequence. However, the epigenome at tissue-specific, distal regulatory regions was observed to be unusually prone to diverge following duplication, with particular sequence differences, altering known sequence motifs, found to be associated with divergence in patterns of DNA methylation and chromatin. Alu elements were found to have played a particularly prominent role in shaping human epigenome evolution, and we show that human-specific AluY insertion events are strongly linked to the evolution of the DNA methylation landscape and gene expression levels, including at key neurological genes in the human brain. Studying paralogous regions within the same sample enables the study of the links between genome and epigenome evolution while controlling for biological and technical variation. We show DNA methylation and chromatin divergence between duplicated regions are linked to the divergence of particular genetic motifs, with Alu elements having played a disproportionate role in the evolution of the epigenome in the human lineage.
authors: The Roslin Institute, The University of Edinburgh, Midlothian, United Kingdom prenderj@gmail.com james.prendergast@roslin.ed.ac.uk.
authors: James G D
authors: JG
authors: Prendergast
authors: The Roslin Institute, The University of Edinburgh, Midlothian, United Kingdom.
authors: Emily V
authors: EV
authors: Chambers
authors: MRC Human Genetics Unit, MRC Institute of Genetics and Molecular Medicine, University of Edinburgh, Western General Hospital, United Kingdom.
authors: Colin A M
authors: CA
authors: Semple
mesh_terms: D020087:Alu Elements / Q000235:genetics; D020816:Amino Acid Motifs; D019070:Cell Lineage; D002843:Chromatin / Q000235:genetics*; D019175:DNA Methylation; D057890:Epigenomics; D019143:Evolution, Molecular; D005786:Gene Expression Regulation; D006801:Humans
chemical_list: D002843:Chromatin
keywords: chromatin; duplication; epigenome; evolution; methylation; paralogous