The Effects of CpG Densities around Transcription Start Sites on Sex-Biased Gene Expression in Poecilia reticulata.

Abstract:

:As most genes are shared between females and males, DNA methylation is assumed to play a crucial role in sex-biased gene expression. DNA methylation exclusively occurs at CpG dinucleotides, and therefore, we would expect that CpG density around transcription start sites (TSSs) relate to sex-biased gene expression. Here we investigated the relationship between CpG densities around TSSs and the ratio of gene expression levels between sexes in the guppy (Poecilia reticulata), which displays remarkable sexual dimorphisms. We found that genes with sex-biased gene expression had different CpG densities downstream of TSSs compared with genes lacking sex-biased gene expression. Intriguingly, male-biased expression genes with intermediate CpG density downstream of TSSs exhibited greater differences in gene expression between sexes in the gonad and tail. Our findings suggested the possibility that CpGs around TSSs, especially in the downstream regions, play a crucial role in sex-biased gene expression through DNA methylation.

journal_name

Genome Biol Evol

authors

Tamagawa K,Makino T,Kawata M

doi

10.1093/gbe/evx083

subject

Has Abstract

pub_date

2017-05-01 00:00:00

pages

1204-1211

issue

5

issn

1759-6653

pii

3766286

journal_volume

9

pub_type

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