Corporate Banner
Satellite Banner
ADME Tox
Scientific Community
 
Become a Member | Sign in
Home>News>This Article
  News
Return

Coupling Genome Defence to Epigenetic Reprogramming

Published: Thursday, September 06, 2012
Last Updated: Thursday, September 06, 2012
Bookmark and Share
The work, just published in Development, identifies genes DIRECTLY regulated by DNA methylation.

The promoters of these genes appear to possess a specialised chromatin environment that does not acquire any of the repressive H3K27me3, H3K9me2, H3K9me3 or H4K20me3 histone modifications when silenced by DNA methylation in somatic cells. Intriguingly, this methylation-dependent subset is highly enriched in genes with roles in suppressing Transposable element activity in germ cells.

DNA methylation plays an important role in gene silencing and repressing transposable elements (TEs). During primordial germ cell (PGC) development, DNA methylation marks are erased during extensive epigenetic reprogramming, so how does this demethylation impact gene expression and TE repression in PGCs? Richard Meehan and co-workers show that DNA methylation at the promoters of germline-specific genes couples genome-defence mechanisms to epigenetic reprogramming in mouse PGCs. The researchers identify a set of germline-specific genes that are dependent exclusively on promoter DNA methylation for their silencing; their promoters possess specialised chromatin in somatic cells that does not acquire additional repressive histone modifications. This set, they discover, is enriched in genes involved in suppressing TE activity in germ cells, and the expression of these genes is activated during two phases of DNA demethylation in PGCs. These findings suggest that unique reliance on promoter DNA methylation acts as a highly tuned sensor of global DNA demethylation and allows PGCs to be primed to suppress TEs.

Hackett JA, Reddington JP, Nestor CE, Dunican DS, Branco MR, Reichmann J, Reik W, Surani MA, Adams IR, Meehan RR.
Promoter DNA methylation couples genome-defence mechanisms to epigenetic reprogramming in the mouse germline.
Development. 2012 Oct;139(19):3623-32. PubMed PMID: 22949617.


Further Information

Join For Free

Access to this exclusive content is for Technology Networks Premium members only.

Join Technology Networks Premium for free access to:

  • Exclusive articles
  • Presentations from international conferences
  • Over 3,300+ scientific posters on ePosters
  • More than 5,000+ scientific videos on LabTube
  • 35 community eNewsletters


Sign In



Forgotten your details? Click Here
If you are not a member you can join here

*Please note: By logging into TechnologyNetworks.com you agree to accept the use of cookies. To find out more about the cookies we use and how to delete them, see our privacy policy.

Related Content

Defending Ourselves by Keeping ‘Junk DNA’ Quiet
By genome-wide mapping in two mutant cell lines, the Meehan lab shows that loss of DNA methylation is coincident with specific activation of the IAP endogenous retroposon and the appearance of virus like particles.
Wednesday, January 01, 2014
Unanticipated Consequences of DNA Hypomethylation; Loss and Gain of Polycomb Mediated Transcription Repression in Somatic Cells
By genome-wide mapping of the Polycomb Repressive Complex 2 (PRC2)-signature histone mark, H3K27me3, in DNA methylation-deficient mouse somatic cells, the Meehan lab shows that loss of DNA methylation is coincident with widespread H3K27me3 redistribution.
Monday, April 01, 2013
Tissue of Origin Determines Cancer-associated CpG Island Promoter Hypermethylation Patterns
Meehan, Sproul and co-workers conclude that general aberrant promoter hypermethylation in cancer does not promote tumorigenesis, but instead reinforces transcription repression inherited from pre-cancerous tissue.
Friday, October 05, 2012
Non-Genotoxic Carcinogen Exposure Induces Defined Changes in the 5-Hydroxymethylome
In a genome wide study Meehan, Moggs and MARCAR co-authors examined 5mC and 5hmC profiles of liver in control and phenobarbital treated mice. They observe dynamic and reciprocal changes in the 5mC/5hmC patterns over genes promoters that are transcriptionally up-regulated.
Friday, October 05, 2012
Scientific News
The Fight Against Fungal Infections
A pioneering university research team has recently employed such a system within their laboratory to obtain a greater understanding of the dynamics and progression of C. albicans in vivo using a mouse model.
Fly Study into Therapies for HVP-Induced Cancer
Fruit flies may help scientists understand the mechanism by which HPV can cause cancer as well as identify potential drug treatments.
Exploring Ebola-Malaria Link
Data shows people infected with Ebola were more likely to survive if co-infected with malarial parasite.
Precision Nanobots Target Cancerous Tumours
Researchers achieve breakthrough toward redefining anti-cancer drug administration using nanorobotics.
Characterizing the Mouse Gut Microbiome
Study establishes the first public collection of bacteria from the intestine of mice.
Common Drug Shows Potential as Alzheimer's Cure
A research project has shown that an experimental model of Alzheimer’s disease can be successfully treated with a commonly used anti-inflammatory drug.
How Cloud Connectivity Can Combat the Reproducibility Crisis
This infographic explains the reproducibility crisis, and how cloud connectivity can help overcome this problem.
Magnetic Drug Delivery in the Body
Imagine a device that could transport drugs to any diseased site in the body with the help of a small magnet.
The Power of Model Systems
New insights into the influence of host on the gut microbiome are revealed with in situ light sheet fluorescence microscopy and stochastic mathematical modelling.
Using Animal Embryos Containing Human Cells
With recent advances in stem cell and gene editing technologies, an increasing number of researchers are interested in growing human tissues and organs in animals by introducing pluripotent human cells into early animal embryos.
SELECTBIO

SELECTBIO Market Reports
Go to LabTube
Go to eposters
 
Access to the latest scientific news
Exclusive articles
Upload and share your posters on ePosters
Latest presentations and webinars
View a library of 1,800+ scientific and medical posters
3,300+ scientific and medical posters
A library of 2,500+ scientific videos on LabTube
5,000+ scientific videos
Close
Premium CrownJOIN TECHNOLOGY NETWORKS PREMIUM FOR FREE!