Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

DNA sequence controls expression of gene involved in cancer

01.10.2004


Scientists have discovered a DNA sequence that causes the destabilization, and hence decay, of the protooncogene bcl-2 (B-cell lymphoma/leukemia-2). Because the overexpression of bcl-2 is associated with cancer, this discovery may lead to new therapeutic strategies for treating the disease.



The research appears as the "Paper of the Week" in the October 8 issue of the Journal of Biological Chemistry, an American Society for Biochemistry and Molecular Biology journal.

Bcl-2 is a gene that, when mutated or inappropriately expressed, can cause a cell to become cancerous. Normally, bcl-2 produces a protein that inhibits cell death or apoptosis. This protein keeps death-promoting factors from producing holes in the mitochondria which can result in calcium and destructive proteins leaking out into the cell. However, the overexpression of bcl-2 in damaged cells can lead to the continued division of the mutated cells and eventually cancer.


The expression of the bcl-2 gene is regulated both transcriptionally and posttranscriptionally. One way bcl-2 levels are controlled is through an adenine and uracil-rich sequence of nucleotides in the 3’ untranslated region of the bcl-2 mRNA. This sequence, called the AU-rich element, or ARE, recruits a number of proteins that destabilize the bcl-2 mRNA, resulting in its degradation.

A report that a region of RNA upstream of the ARE also affects mRNA stability motivated Dr. Jeong-Hwa Lee and his colleagues at the Catholic University of Korea to make a series of bcl-2 mRNA constructs with deletions around the ARE.

From these constructs, the investigators identified a region of 30 nucleotides outside the ARE that destabilizes bcl-2 mRNA both in the absence and in the presence of the ARE. Because the region is composed mostly of cytosine and adenine repeats, they named it the CA-repeated Region (CAR).

The discovery of a new region on the bcl-2 gene that controls its expression may be big news for cancer therapy. Several drugs that reduce the amount of bcl-2 present in the cell are already used in chemotherapy to induce apoptosis and overcome drug resistance in cancer cells.

Nicole Kresge | EurekAlert!
Further information:
http://www.asbmb.org

More articles from Life Sciences:

nachricht How brains surrender to sleep
23.06.2017 | IMP - Forschungsinstitut für Molekulare Pathologie GmbH

nachricht A new technique isolates neuronal activity during memory consolidation
22.06.2017 | Spanish National Research Council (CSIC)

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Can we see monkeys from space? Emerging technologies to map biodiversity

An international team of scientists has proposed a new multi-disciplinary approach in which an array of new technologies will allow us to map biodiversity and the risks that wildlife is facing at the scale of whole landscapes. The findings are published in Nature Ecology and Evolution. This international research is led by the Kunming Institute of Zoology from China, University of East Anglia, University of Leicester and the Leibniz Institute for Zoo and Wildlife Research.

Using a combination of satellite and ground data, the team proposes that it is now possible to map biodiversity with an accuracy that has not been previously...

Im Focus: Climate satellite: Tracking methane with robust laser technology

Heatwaves in the Arctic, longer periods of vegetation in Europe, severe floods in West Africa – starting in 2021, scientists want to explore the emissions of the greenhouse gas methane with the German-French satellite MERLIN. This is made possible by a new robust laser system of the Fraunhofer Institute for Laser Technology ILT in Aachen, which achieves unprecedented measurement accuracy.

Methane is primarily the result of the decomposition of organic matter. The gas has a 25 times greater warming potential than carbon dioxide, but is not as...

Im Focus: How protons move through a fuel cell

Hydrogen is regarded as the energy source of the future: It is produced with solar power and can be used to generate heat and electricity in fuel cells. Empa researchers have now succeeded in decoding the movement of hydrogen ions in crystals – a key step towards more efficient energy conversion in the hydrogen industry of tomorrow.

As charge carriers, electrons and ions play the leading role in electrochemical energy storage devices and converters such as batteries and fuel cells. Proton...

Im Focus: A unique data centre for cosmological simulations

Scientists from the Excellence Cluster Universe at the Ludwig-Maximilians-Universität Munich have establised "Cosmowebportal", a unique data centre for cosmological simulations located at the Leibniz Supercomputing Centre (LRZ) of the Bavarian Academy of Sciences. The complete results of a series of large hydrodynamical cosmological simulations are available, with data volumes typically exceeding several hundred terabytes. Scientists worldwide can interactively explore these complex simulations via a web interface and directly access the results.

With current telescopes, scientists can observe our Universe’s galaxies and galaxy clusters and their distribution along an invisible cosmic web. From the...

Im Focus: Scientists develop molecular thermometer for contactless measurement using infrared light

Temperature measurements possible even on the smallest scale / Molecular ruby for use in material sciences, biology, and medicine

Chemists at Johannes Gutenberg University Mainz (JGU) in cooperation with researchers of the German Federal Institute for Materials Research and Testing (BAM)...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Plants are networkers

19.06.2017 | Event News

Digital Survival Training for Executives

13.06.2017 | Event News

Global Learning Council Summit 2017

13.06.2017 | Event News

 
Latest News

Individualized fiber components for the world market

23.06.2017 | Physics and Astronomy

How brains surrender to sleep

23.06.2017 | Life Sciences

Can we see monkeys from space? Emerging technologies to map biodiversity

23.06.2017 | Information Technology

VideoLinks
B2B-VideoLinks
More VideoLinks >>>