Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Key information about breast cancer risk and development is found in 'junk' DNA

17.12.2010
A new genetic biomarker that indicates an increased risk for developing breast cancer can be found in an individual's "junk" (non-coding) DNA, according to a new study featuring work from researchers at the Virginia Bioinformatics Institute (VBI) at Virginia Tech and their colleagues.
The multidisciplinary team found that longer DNA sequences of a repetitive microsatellite were much more likely to be present in breast cancer patients than healthy volunteers. The particular repeated DNA sequence in the control (promoter) region of the estrogen-related receptor gamma (ERR-¦Ã) gene ¨C AAAG ¨C contains between five and 21 copies and the team found that patients who have more than 13 copies of this repeat have a cancer susceptibility rate that is three times higher than those who do not. They also discovered that this repeat doesn't change the actual protein being reproduced, but likely changes the amount.

The researchers from VBI's Medical Informatics and Systems Division (https://www.vbi.vt.edu/vbi_faculty/vbi_research_group/personal_research_group_page?groupId=6), the University of Texas Southwestern Medical Center and the University of Liverpool, United Kingdom, report their findings in an upcoming edition of the journal Breast Cancer Research and Treatment. The study is currently available online. The group sequenced a specific region of the ERR-¦Ã gene in approximately 500 patient and volunteer samples. While the gene has previously been shown to play a role in breast cancer susceptibility, its mechanism was unknown.

"Creating robust biomarkers to detect disease in their early stages requires access to a large number of clinical samples for analysis. The success of this work hinged on collaborations with clinicians with available samples, as well as researchers with expertise in a variety of areas and access to the latest technology," explained Harold "Skip" Garner, VBI executive director who leads the institute's Medical Informatics and Systems Division. "We are now working to translate this biomarker into the clinical setting as a way to inform doctors and patients about breast cancer susceptibility, development, and progression. Akin to the major breast cancer biomarkers BRCA1 and BRCA2, this will be of particular benefit to those high-risk patients with a history of cancer in their family."

The majority of DNA is non-coding, meaning its not transcribed into protein. The largest amount of this type of DNA consists of these microsatellites ¨C specific repeated sequences of one to six nucleotides within the genome. There are over two million microsatellites in the human genome, yet only a small number of these repetitive sequences have previously been linked to disease, particularly neurological disorders and cancer.

"We've become increasingly aware that non-coded DNA has an important function related to human disease," said Michael Skinner, M.D., professor of pediatric surgery at the University of Texas Southwestern Medical Center and collaborator on the project. "Replication of this study in another set of patients is needed, but the results indicate that that this particular gene is an important one in breast cancer and they reveal more details about the expression of the gene. This kind of work could eventually result in the creation of a drug that would specifically interact with this gene to return expression levels to a normal range."

"Ninety percent of all the breast cancer patients we see aren't considered high risk patients, which means there wasn't any indication that they would be susceptible to breast cancer," said Dr. James Mullet, a radiologist at Carilion Clinic's Breast Care Center. "This compels us to screen everyone in some way. If we had a better test ¨C one that is more robust and sensitive, but also specific ¨C we could make sure the women with most risk are getting properly screened for breast cancer."

"One practical clinical application of this research is to have a test available that would allow us to tailor our screening better," Mullet said. "For example, we could lessen patients' time, expense, and worry if we could better determine which patients would need only a mammogram, as opposed to additional tests like ultrasound or screening breast MRI. This work may also give us genetic insight into the cause of the breast cancer that may develop in those 90 percent of patients who are not currently identified as high risk."

According to Garner, "There is a big gap between what is suspected and what is known about the genetics of cancer. While more work is needed to better understand how these changes play a role in cancer, these results can be used now as a new test for breast cancer susceptibility and, as our data suggests, for colon cancer susceptibility and possibly other types of cancer. We think this is just the beginning of what there is to be found in our junk DNA."

This work was funded by the P.O'B Montgomery Distinguished Chair in Developmental Biology, University of Texas Southwestern Medical Center, the Hudson Foundation, and the Virginia Bioinformatics Institute at Virginia Tech, and was partially supported by the University of Texas' National Institutes of Health's National Cancer Institute SPORE project (P50CA70907).

Read the paper online:

Galindo CL, McCormick JF, Bubb VJ, Abid Alkadem DH, Li LS, McIver LJ, George AC, Boothman DA, Quinn JP, Skinner MA, Garner HR. A long AAAG repeat allele in the 5¡ä UTR of the ERR-¦Ã gene is correlated with breast cancer predisposition and drives promoter activity in MCF-7 breast cancer cells. Available from Breast Cancer Research and Treatment (2010)

About the Virginia Bioinformatics Institute

The Virginia Bioinformatics Institute (http://www.vbi.vt.edu) at Virginia Tech is a premier bioinformatics, computational biology, and systems biology research facility that uses transdisciplinary approaches to science combining information technology, biology, and medicine. These approaches are used to interpret and apply vast amounts of biological data generated from basic research to some of today's key challenges in the biomedical, environmental, and agricultural sciences. With more than 240 highly trained multidisciplinary, international personnel, research at the institute involves collaboration in diverse disciplines such as mathematics, computer science, biology, plant pathology, biochemistry, systems biology, statistics, economics, synthetic biology, and medicine. The large amounts of data generated by this approach are analyzed and interpreted to create new knowledge that is disseminated to the world's scientific, governmental, and wider communities.

Susan Bland | EurekAlert!
Further information:
http://www.vbi.vt.edu

More articles from Life Sciences:

nachricht When Air is in Short Supply - Shedding light on plant stress reactions when oxygen runs short
23.03.2017 | Institut für Pflanzenbiochemie

nachricht WPI team grows heart tissue on spinach leaves
23.03.2017 | Worcester Polytechnic Institute

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: Giant Magnetic Fields in the Universe

Astronomers from Bonn and Tautenburg in Thuringia (Germany) used the 100-m radio telescope at Effelsberg to observe several galaxy clusters. At the edges of these large accumulations of dark matter, stellar systems (galaxies), hot gas, and charged particles, they found magnetic fields that are exceptionally ordered over distances of many million light years. This makes them the most extended magnetic fields in the universe known so far.

The results will be published on March 22 in the journal „Astronomy & Astrophysics“.

Galaxy clusters are the largest gravitationally bound structures in the universe. With a typical extent of about 10 million light years, i.e. 100 times the...

Im Focus: Tracing down linear ubiquitination

Researchers at the Goethe University Frankfurt, together with partners from the University of Tübingen in Germany and Queen Mary University as well as Francis Crick Institute from London (UK) have developed a novel technology to decipher the secret ubiquitin code.

Ubiquitin is a small protein that can be linked to other cellular proteins, thereby controlling and modulating their functions. The attachment occurs in many...

Im Focus: Perovskite edges can be tuned for optoelectronic performance

Layered 2D material improves efficiency for solar cells and LEDs

In the eternal search for next generation high-efficiency solar cells and LEDs, scientists at Los Alamos National Laboratory and their partners are creating...

Im Focus: Polymer-coated silicon nanosheets as alternative to graphene: A perfect team for nanoelectronics

Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are less stable. Now researchers at the Technical University of Munich (TUM) have, for the first time ever, produced a composite material combining silicon nanosheets and a polymer that is both UV-resistant and easy to process. This brings the scientists a significant step closer to industrial applications like flexible displays and photosensors.

Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are...

Im Focus: Researchers Imitate Molecular Crowding in Cells

Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to simulate these confined natural conditions in artificial vesicles for the first time. As reported in the academic journal Small, the results are offering better insight into the development of nanoreactors and artificial organelles.

Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

International Land Use Symposium ILUS 2017: Call for Abstracts and Registration open

20.03.2017 | Event News

CONNECT 2017: International congress on connective tissue

14.03.2017 | Event News

ICTM Conference: Turbine Construction between Big Data and Additive Manufacturing

07.03.2017 | Event News

 
Latest News

When Air is in Short Supply - Shedding light on plant stress reactions when oxygen runs short

23.03.2017 | Life Sciences

Researchers use light to remotely control curvature of plastics

23.03.2017 | Power and Electrical Engineering

Sea ice extent sinks to record lows at both poles

23.03.2017 | Earth Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>