Uncoupling antisense-mediated silencing and DNA methylation in the imprinted Gnas cluster.

Abstract:

:There is increasing evidence that non-coding macroRNAs are major elements for silencing imprinted genes, but their mechanism of action is poorly understood. Within the imprinted Gnas cluster on mouse chromosome 2, Nespas is a paternally expressed macroRNA that arises from an imprinting control region and runs antisense to Nesp, a paternally repressed protein coding transcript. Here we report a knock-in mouse allele that behaves as a Nespas hypomorph. The hypomorph mediates down-regulation of Nesp in cis through chromatin modification at the Nesp promoter but in the absence of somatic DNA methylation. Notably there is reduced demethylation of H3K4me3, sufficient for down-regulation of Nesp, but insufficient for DNA methylation; in addition, there is depletion of the H3K36me3 mark permissive for DNA methylation. We propose an order of events for the regulation of a somatic imprint on the wild-type allele whereby Nespas modulates demethylation of H3K4me3 resulting in repression of Nesp followed by DNA methylation. This study demonstrates that a non-coding antisense transcript or its transcription is associated with silencing an overlapping protein-coding gene by a mechanism independent of DNA methylation. These results have broad implications for understanding the hierarchy of events in epigenetic silencing by macroRNAs.

journal_name

PLoS Genet

journal_title

PLoS genetics

authors

Williamson CM,Ball ST,Dawson C,Mehta S,Beechey CV,Fray M,Teboul L,Dear TN,Kelsey G,Peters J

doi

10.1371/journal.pgen.1001347

subject

Has Abstract

pub_date

2011-03-01 00:00:00

pages

e1001347

issue

3

eissn

1553-7390

issn

1553-7404

journal_volume

7

pub_type

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