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 3,000+ scientific posters on ePosters
  • More than 4,400+ 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
Cell Transplant Treats Parkinson’s in Mice
A University of Wisconsin—Madison neuroscientist has inserted a genetic switch into nerve cells so a patient can alter their activity by taking designer drugs that would not affect any other cell.
Understanding Female HIV Transmission
Glowing virus maps points of entry through entire female reproductive tract for first time.
Experimental Drug Cancels Effect from Key Intellectual Disability Gene
A University of Wisconsin—Madison researcher who studies the most common genetic intellectual disability has used an experimental drug to reverse — in mice — damage from the mutation that causes the syndrome.
Common Class of Cancer Drugs May Not Lead to Cognitive Decline
UCLA study refutes 2015 research suggesting anthracyclines could cause memory loss, other impairments.
Designing Better Drugs
A rational drug engineering approach could breathe new life into drug development.
Genetic Approach May Lead to New Treatments for Digestive Diseases
Researchers at UMass Medical School have identified a new molecular pathway critical for maintaining the smooth muscle tone that allows the passage of materials through the digestive system.
Potential Target for Revolutionary Antibiotics
An international team of including the Lomonosov Moscow State University researchers discovered which enzyme enables Escherichia coli bacterium (E. coli) to breathe.
Unique Model for Studying ALS
Unique mouse model will allow researchers to better study the genetic origins and potential treatments of ALS.
Factors Influencing Influenza Vaccine Effectiveness Uncovered
The long-held approach to predicting seasonal influenza vaccine effectiveness may need to be revisited, new research suggests.
New Model to Enhance Zika Virus Research
The model will allow researchers to better understand how the virus causes disease and aid in the development of antiviral compounds and vaccines.
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
3,000+ scientific and medical posters
A library of 2,500+ scientific videos on LabTube
4,400+ scientific videos
Close
Premium CrownJOIN TECHNOLOGY NETWORKS PREMIUM FOR FREE!