CpG islands under selective pressure are enriched with H3K4me3, H3K27ac and H3K36me3 histone modifications.

Abstract:

BACKGROUND:Histone modification is an epigenetic mechanism that influences gene regulation in eukaryotes. In particular, histone modifications in CpG islands (CGIs) are associated with different chromatin states and with transcription activity. Changes in gene expression play a crucial role in adaptation and evolution. RESULTS:In this paper, we have studied, using a computational biology approach, the relationship between histone modifications in CGIs and selective pressure in Homo sapiens. We considered three histone modifications: histone H3 lysine 4 trimethylation (H3K4me3), histone H3 lysine 27 acetylation (H3K27ac) and histone H3 lysine 36 trimethylation (H3K36me3), and we used the publicly available genomic-scale histone modification data of thirteen human cell lines. To define regions under selective pressure, we used three distinct signatures that mark selective events from different evolutionary periods. We found that CGIs under selective pressure showed significant enrichments for histone modifications. CONCLUSION:Our result suggests that, CGIs that have undergone selective events are characterized by epigenetic signatures, in particular, histone modifications that are distinct from CGIs with no evidence of selection.

journal_name

BMC Evol Biol

journal_title

BMC evolutionary biology

authors

Akhtar MM,Scala G,Cocozza S,Miele G,Monticelli A

doi

10.1186/1471-2148-13-145

subject

Has Abstract

pub_date

2013-07-10 00:00:00

pages

145

issn

1471-2148

pii

1471-2148-13-145

journal_volume

13

pub_type

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