Navigation Links
How the wrong genes are repressed: New finding from UCL
Date:6/11/2010

The mechanism by which 'polycomb' proteins critical for embyronic stem cell function and fate are targeted to DNA has been identified by UCL scientists.

The discovery, which has implications for the fields of stem cell and tissue engineering, is detailed in research published today in the journal Molecular Cell.

A key feature of stem cells is the suppression of genes that when later switched on lead to the differentiation of the cells into specific mature cell types, such as neurons or immune cells. Polycomb proteins, first discovered in fruit flies, are known to play a critical role in the suppression of these developmental genes. PRC2 (polycomb repressive complex-2) is present in all multicellular organisms and has been shown to be important in stem cell differentiation and early embryonic development.

The study authors found that PRC2 is brought to its target genes though binding to a new class of short RNAs transcribed by RNA polymerase II. PRC2 can then methylate chromatin, preventing the activation of developmental regulator genes that would otherwise act to alter the identity of the cell.

Senior author Dr Richard Jenner, UCL Infection & Immunity, said: "We knew that different sets of genes are turned on in different cells and that polycomb proteins prevent the wrong genes from being turned on, for example polycomb prevents the activation of neuronal genes in immune cells. However, although polycomb proteins repress genes, they are actually in a poised state some sort of gene activity seemed to be occurring.

"We wanted to find out what this activity was and our identification of these short RNAs explains this unusual gene state. Discovering that polycomb also binds to these RNAs shows how polycomb might be recruited to genes, which are then repressed to maintain the identities of different cell types. This has been a key question in the field for some time and has important implications for how we might be able to control cell fate in tissue engineering".


'/>"/>

Contact: Ruth Howells
ruth.howells@ucl.ac.uk
44-207-679-9739
University College London
Source:Eurekalert

Related biology news :

1. Doctors may be giving the wrong dosage of adrenaline in an emergency because of labelling
2. Darwin was wrong about the wild origin of the chicken
3. Study shows Darwin was wrong about the origins of chickens
4. Are existing large-scale simulations of water dynamics wrong?
5. Princeton scientists find way to catalog all that goes wrong in a cancer cell
6. Gene regulation, not just genes, is what sets humans apart
7. Interaction of just 2 genes governs coloration patterns in mice
8. Muscle mass: Scientists identify novel mode of transcriptional regulation during myogenesis
9. Study finds blocking angiogenesis signaling from inside cell may lead to serious health problems
10. Smoking turns on genes -- permanently
11. Genes, Environment and Health Initiative invests in genetic studies, environmental monitoring
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:2/3/2016)... --> --> ... Fingerprint Identification System Market by Component (Hardware and Software), ... Finance, Government, Healthcare, and Transportation) and Geography - Global ... expected to be worth USD 8.49 Billion by 2020 ... 2020. The transformation and technology evolution from the manual ...
(Date:2/3/2016)... , Feb. 3, 2016 ... the addition of the "Emotion Detection ... Machine Learning, and Others), Software Tools (Facial ... Areas, End Users,and Regions - Global forecast ... --> http://www.researchandmarkets.com/research/d8zjcd/emotion_detection ) has ...
(Date:2/2/2016)... 2016 This BCC Research report provides ... reviewing the recent advances in high throughput ‘omic ... field forward. Includes forecast through 2019. ... and opportunities that exist in the bioinformatic market. ... as well as IT and bioinformatics service providers. ...
Breaking Biology News(10 mins):
(Date:2/8/2016)... Conn. , Feb. 8, 2016  NanoViricides, Inc. (NYSE MKT: ... its CEO, Eugene Seymour , MD, MPH, will present information ... at the Waldorf-Astoria Hotel in New York City ... will be in the Windsor Room at 5:30PM EST. Registered attendees ... New York City . --> ...
(Date:2/6/2016)... ... February 06, 2016 , ... Contact:, Abby Mitchell, ... Excellence in Education Sponsors Teacher Training Program , Bite of Science Dinner Event ... Center for Excellence in Education (CEE) will sponsor a Bite of Science professional ...
(Date:2/5/2016)... SYDNEY , Feb. 5, 2016 Australian-US drug ... ), announced today the appointment of a new Chairman, Mr ... Bryce Carmine , effective immediately. James Garner ... an Executive Director and former Acting CEO, Mr Iain ... a Non-Executive Director. --> James Garner , has ...
(Date:2/4/2016)... ... February 04, 2016 , ... ... Club, takes place February 5-6 at the University’s student center, Kehr Union, ... such as workshops and competitions for ample networking, learning and collaborating opportunities. ...
Breaking Biology Technology: