Featured Research

from universities, journals, and other organizations

Jefferson Scientists Find Gene Expression Pattern May Predict Behavior Of Leukemia

Date:
August 16, 2004
Source:
Thomas Jefferson University
Summary:
The expression pattern of certain genes may someday help doctors to diagnose and predict whether or not an individual has an aggressive form of B-cell chronic lymphocytic leukemia (CLL), Jefferson cancer researchers have found.

The expression pattern of certain genes may someday help doctors to diagnose and predict whether or not an individual has an aggressive form of B-cell chronic lymphocytic leukemia (CLL), Jefferson cancer researchers have found.

Scientists, led by Carlo Croce, M.D., director of Jefferson's Kimmel Cancer Center and professor and chair of microbiology and immunology at Jefferson Medical College of Thomas Jefferson University in Philadelphia, looked at the expression of genes that encoded microRNAs (miRNAs), tiny pieces of genetic material that are thought to be important in the regulation of gene expression and in the development of cancer. MiRNAs can serve as stop signs for gene expression and protein synthesis, and are thought to play important roles in regulating gene expression in development.

Reporting in both the online and the August 10 print version of the Proceedings of the National Academy of Sciences, the researchers – taking advantage of a microarray chip Dr. Croce and his colleagues designed that carries all the known human miRNA genes – compared the expression of miRNA genes in human CLL samples with that of normal white blood cells, or lymphocytes, called CD5+ B cells. CLL, the most common adult leukemia in the Western world, is characterized by an abnormal increase in the number of B cells.

"We found two specific genetic signatures," Dr. Croce says. One expression pattern of miRNA genes in CLL correlated with a deletion of a chromosomal region called 13q14. This region contained two small miRNA genes that are turned off in about 60 percent of CLL cases. The deletions at 13q14 represent an indicator of a good prognosis for the disease, he notes.

The other miRNA signature was associated with mutations in the Ig or immunoglobulin gene, which also indicates a good prognosis, says Dr. Croce. The researchers also found that the expression of one of the miRNA genes, miR-16, was reduced in both signatures.

"This suggests that CLL involves changes in miRNA, and that you can predict the behavior of CLL depending on the miRNA genetic signature," says Dr. Croce. "We think we might be able to predict CLL behavior based on the miR-16 signature because that is the only common denominator between the two signatures with good prognosis." But before using miRNA expression as any kind of clinical biomarker, says Dr. Croce, the results need to be verified in a clinical trial screening thousands of patients.

Dr. Croce and his colleagues had previously shown that deletions in miRNA genes were involved in B-cell CLL. They also had reported that human miRNA genes are frequently located at sites of the genome that are altered in human cancers.

The work might enable scientists to gain a better understanding of the roles of miRNAs in cancer and provide targets for future drug development.


Story Source:

The above story is based on materials provided by Thomas Jefferson University. Note: Materials may be edited for content and length.


Cite This Page:

Thomas Jefferson University. "Jefferson Scientists Find Gene Expression Pattern May Predict Behavior Of Leukemia." ScienceDaily. ScienceDaily, 16 August 2004. <www.sciencedaily.com/releases/2004/08/040811081034.htm>.
Thomas Jefferson University. (2004, August 16). Jefferson Scientists Find Gene Expression Pattern May Predict Behavior Of Leukemia. ScienceDaily. Retrieved August 29, 2014 from www.sciencedaily.com/releases/2004/08/040811081034.htm
Thomas Jefferson University. "Jefferson Scientists Find Gene Expression Pattern May Predict Behavior Of Leukemia." ScienceDaily. www.sciencedaily.com/releases/2004/08/040811081034.htm (accessed August 29, 2014).

Share This




More Health & Medicine News

Friday, August 29, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

3 Things To Know About The Ebola Outbreak's Progression

3 Things To Know About The Ebola Outbreak's Progression

Newsy (Aug. 29, 2014) Here are three things you need to know about the deadly Ebola outbreak's progression this week. Video provided by Newsy
Powered by NewsLook.com
Killer Amoeba Found in Louisiana Water System

Killer Amoeba Found in Louisiana Water System

AP (Aug. 28, 2014) State health officials say testing has confirmed the presence of a killer amoeba in a water system serving three St. John the Baptist Parish towns. (Aug. 28) Video provided by AP
Powered by NewsLook.com
Who Could Be Burnt by WHO's E-Cigs Move?

Who Could Be Burnt by WHO's E-Cigs Move?

Reuters - Business Video Online (Aug. 28, 2014) The World Health Organisation has called for the regulation of electronic cigarettes as both tobacco and medical products. Ciara Lee looks at the impact of the move on the tobacco industry. Video provided by Reuters
Powered by NewsLook.com
CDC Director On Ebola Outbreak: 'It's Worse Than I Feared'

CDC Director On Ebola Outbreak: 'It's Worse Than I Feared'

Newsy (Aug. 28, 2014) CDC director Tom Frieden says the Ebola outbreak is even worse than he feared. But he also said there's still hope to contain it. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins