Featured Research

from universities, journals, and other organizations

Genes That Increase Rheumatoid Arthritis Risk Identified

Date:
October 5, 2007
Source:
NIH, National Institute of Arthritis and Musculoskeletal and Skin Diseases
Summary:
A genetic region that is associated with increased risk of rheumatoid arthritis has been identified. The disease is a chronic and debilitating inflammatory disease of the joints that affects an estimated 2.1 million Americans. The hope is that by learning more about the genes and their role in the disease, scientists may find clues to influencing treatment of the disease.

Researchers in the United States and Sweden have identified a genetic region associated with increased risk of rheumatoid arthritis (RA), a chronic and debilitating inflammatory disease of the joints that affects an estimated 2.1 million Americans.

The U.S. arm of the study involved a long-time collaboration between intramural researchers of the National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS) and other organizations. NIAMS is one of 27 institutes and centers at the National Institutes of Health.

Using the relatively new genome-wide association approach — which makes it possible to analyze between 300,000 and 500,000 single nucleotide polymorphisms (SNPs, or small differences in DNA that are distributed throughout a person’s genetic code) — researchers in both countries searched for genetic differences in blood samples from people with RA compared to controls.

The U.S. group compared 908 samples from patients provided by the North American Rheumatoid Arthritis Consortium (NARAC) — a group of investigators working together to identify the genetic factors that contribute to RA — with those from 1,282 people without RA (controls). The Swedish group compared 676 samples from the Swedish Epidemiological Investigation of Rheumatoid Arthritis (EIRA) with 673 controls.

Both groups' searches led them to a region of chromosome 9 containing two genes relevant to chronic inflammation: TRAF1 (encoding tumor necrosis factor receptor-associated factor 1) and C5 (encoding complement component 5).

"The whole-genome screening method lets us identify genes that contribute to disease-susceptibility without imposing our preconceived notions of the disease. We expected to come up with something new," says Elaine F. Remmers, Ph.D., of the Genetics and Genomics Branch of the NIAMS Intramural Research Program and an author of the study. "We were thrilled to find out that TRAF1-C5 showed association not only in the samples that we did with NARAC but also independently in the Swedish group. By combining our information, we were able to make a much stronger case [for a TRAF1-C5 association]. The combined evidence was pretty impressive."

Remmers says the TRAF1-C5 region was the third of three major susceptibility chromosomal regions for RA identified by their whole genome screen. The first two, HLA-DRB1 and PTPN22, had already been well established.

She says that it's not yet known how the genes in the TRAF1-C5 region influence RA risk. Nor can scientists say which of the two genes is causing the disease. "Actually, both genes are very interesting candidates," she says. "They both control inflammatory processes that really are relevant for the disease, so we could easily envision either of them playing a role — or both."

The hope is that by learning more about the genes and their role in the disease, scientists may find clues to influencing treatment of the disease. "We are hoping that we will find variants in either of the genes that will lead us to new targets for therapy. Once we understand how the RA-associated variants work, we may be able interfere with the pathways the variants are influencing and either prevent the disease or block its progression."

According to coauthor Daniel Kastner, M.D., Ph.D., NIAMS clinical director and chief of the NIAMS Genetics and Genomics Branch, "The success of the study can be attributed in part to the productive, longstanding collaboration between NIAMS intramural researchers and other scientists that the Institute supports around the country." NARAC was established 10 years ago by coauthor Peter K. Gregersen, M.D., at the Feinstein Institute for Medical Research, the North Shore Long Island Jewish Health System, in order to facilitate the collection and analysis of RA genetic samples. Kastner was also a key early member of the NARAC, as were many other investigators at several academic health centers across the United States.

In addition to NIAMS, other support for the U.S. study came from the National Center for Research Resources, the Arthritis Foundation, grants from the Boas Family and the Eileen Ludwig Greenland Center for Rheumatoid Arthritis (Feinstein Institute for Medical Research), the Rosalind Russell Medical Research Center for Arthritis and the Kirkland Scholar Award (University of California, San Francisco).

The results appeared in the New England Journal of Medicine.

Support for the Swedish arm of the study came from the Swedish Medical Research Council, the Swedish Council for Working Life and Social Research, the King Gustaf V’s 80-Year Foundation, the Swedish Rheumatism Foundation, the Stockholm County Council, the AFA insurance company and the Agency for Science Technology and Research, Singapore.


Story Source:

The above story is based on materials provided by NIH, National Institute of Arthritis and Musculoskeletal and Skin Diseases. Note: Materials may be edited for content and length.


Cite This Page:

NIH, National Institute of Arthritis and Musculoskeletal and Skin Diseases. "Genes That Increase Rheumatoid Arthritis Risk Identified." ScienceDaily. ScienceDaily, 5 October 2007. <www.sciencedaily.com/releases/2007/10/071005092736.htm>.
NIH, National Institute of Arthritis and Musculoskeletal and Skin Diseases. (2007, October 5). Genes That Increase Rheumatoid Arthritis Risk Identified. ScienceDaily. Retrieved July 22, 2014 from www.sciencedaily.com/releases/2007/10/071005092736.htm
NIH, National Institute of Arthritis and Musculoskeletal and Skin Diseases. "Genes That Increase Rheumatoid Arthritis Risk Identified." ScienceDaily. www.sciencedaily.com/releases/2007/10/071005092736.htm (accessed July 22, 2014).

Share This




More Health & Medicine News

Tuesday, July 22, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Courts Conflicted Over Healthcare Law

Courts Conflicted Over Healthcare Law

AP (July 22, 2014) Two federal appeals courts issued conflicting rulings Tuesday on the legality of the federally-run healthcare exchange that operates in 36 states. (July 22) Video provided by AP
Powered by NewsLook.com
Why Do People Believe We Only Use 10 Percent Of Our Brains?

Why Do People Believe We Only Use 10 Percent Of Our Brains?

Newsy (July 22, 2014) The new sci-fi thriller "Lucy" is making people question whether we really use all our brainpower. But, as scientists have insisted for years, we do. Video provided by Newsy
Powered by NewsLook.com
Scientists Find New Way To Make Human Platelets

Scientists Find New Way To Make Human Platelets

Newsy (July 22, 2014) Boston scientists have discovered a new way to create fully functioning human platelets using a bioreactor and human stem cells. Video provided by Newsy
Powered by NewsLook.com
Gilead's $1000-a-Pill Drug Could Cure Hep C in HIV-Positive People

Gilead's $1000-a-Pill Drug Could Cure Hep C in HIV-Positive People

TheStreet (July 21, 2014) New research shows Gilead Science's drug Sovaldi helps in curing hepatitis C in those who suffer from HIV. In a medical study, the combination of Gilead's Hep C drug with anti-viral drug Ribavirin cured 76% of HIV-positive patients suffering from the most common hepatitis C strain. Hepatitis C and related complications have been a top cause of death in HIV-positive patients. Typical medication used to treat the disease, including interferon proteins, tended to react badly with HIV drugs. However, Sovaldi's %1,000-a-pill price tag could limit the number of patients able to access the treatment. TheStreet's Keris Lahiff reports from New York. Video provided by TheStreet
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