Navigation Links
Genetic risk factors play role in autoantibody-negative rheumatoid arthritis
Date:4/7/2009

During the past few years, several new genetic risk factors for rheumatoid arthritis (RA) have been identified. The majority of genetic risk factors identified so far have been associated with autoantibody-positive RA, which affects about two-thirds of RA patients, but distinguishing this variant from autoantibody-negative RA, which is less destructive, is considered increasingly important.

A new study led by Diane van der Woude of Leiden University Medical Center in The Netherlands examined 148 twin pairs in which one twin had RA. Participants were tested for antibodies known as anti-citrullinated protein antibodies (ACPAs), which are used because of their specificity and predictive value and for HLA SE (human leukocyte antigen shared epitope) alleles, the most important genetic risk factor for RA. The study was published in the April issue of Arthritis & Rheumatism (http://www3.interscience.wiley.com/journal/76509746/home).

The findings show that ACPA-positive and ACPA-negative RA are associated with different genetic and environmental risk factors, and may constitute distinct entities with different disease mechanisms. The results also showed that the heritability the variation in disease susceptibility that can be explained by genetic factors - was about 66 percent for both ACPA-positive and ACPA-negative RA.

The HLA SE alleles contributed 11 percent to the total genetic variance of RA, 18 percent to the genetic variance of ACPA-positive RA, and only about 2 percent to the genetic variance of ACPA-negative RA. In the past, HLA genes were estimated to contribute 37 percent to the overall inherited risk of RA.

Several new genetic risk factors for RA have recently been identified, but like the HLA SE alleles, they are predominantly associated with ACPA-positive RA. This may be because studies typically include mainly ACPA-positive patients, since most RA patients fall into this group. The authors suggest that new studies that incorporate more ACPA-negative patients will show that these risk factors also predispose individuals to this form of the disease.

The known risk factors for ACPA-negative disease do not confer as high a risk of developing RA as the HLA SE alleles. In light of the finding of the similar heritability of ACPA-positive and ACPA-negative RA, the authors conclude: "This means that genetic predisposition also plays an important role in the pathogenesis of ACPA-negative RA, for which most individual genetic risk factors remain to be identified."


'/>"/>

Contact: Sean Wagner
medicalnews@bos.blackwellpublishing.com
781-388-8550
Wiley-Blackwell
Source:Eurekalert

Related medicine news :

1. Gene Network Sciences Names Departing Merck Head of Genetics Eric Schadt as Co-Chair of Scientific Advisory Board
2. Interleukin Genetics Grants LABEC Pharma a License for Sales and Distribution of Its Heart Health Genetic Test
3. Genetic Finding May Lead to Male Contraceptive
4. Genetic link uncovered in disparate colon cancer death
5. Interleukin Genetics Receives NYSE Amex Staff Determination, Requests Oral Hearing Before the Listing Qualifications Panel
6. Roberta A. Pagon Receives Lifetime Award in Genetics from March of Dimes
7. Genetic changes outside nuclear DNA suspected to trigger more than half of all cancers
8. Researchers Suspect Genetic Link to COPD
9. Genetics Should Decide Warfarin Dose, Study Reiterates
10. Improved Genetic Test Product Empowers Individuals to Better Understand Their Unique Nutritional Needs
11. 23andMe Launches Parkinsons Disease Genetics Initiative
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:2/23/2017)... ... February 23, 2017 , ... Thinksport, the most award-winning ... Gran Fondo of Marin. For the second year in a row, cyclists will ... , “We are thrilled to provide our safe, non-toxic sunscreen to over 2,000 ...
(Date:2/23/2017)... (PRWEB) , ... February 23, 2017 , ... ... outlet with a clinician-based audience, will be participating in Rare Disease Day events, ... Washington, D.C. In addition, Rare Disease Report, a website, weekly e-newsletter and quarterly ...
(Date:2/23/2017)... Fair Lawn, NJ (PRWEB) , ... February 23, ... ... specializing in thought leadership , media relations, content marketing, social media ... Vermont. With several clients already in the state and in nearby New Hampshire, ...
(Date:2/23/2017)... ... 2017 , ... Pink Pig Publishing LLC announces the launch ... the world from different perspectives. By providing a place for people of all ... empathy, and find greater happiness. , "Our approach to structuring content is ...
(Date:2/23/2017)... ... February 23, 2017 , ... The Center for ... Island Consortium for Autism Research and Treatment (RI-CART) and Cinemaworld to present Sensory ... disorder (ASD) to see films in an environment that accommodates their unique needs. ...
Breaking Medicine News(10 mins):
(Date:2/24/2017)... 23, 2017 Report analyzes the worldwide markets for ... analytics for the US, Canada , ... Asia-Pacific , Latin America , ... for the period 2015 through 2022. Also, a six-year historic ... are derived from primary and secondary research. Company profiles are ...
(Date:2/24/2017)... Australia , Feb. 23, 2017  Directors from Pharma To ... two companies have joined forces, resulting in the founding of Pharma ... Pharma To Market are pleased to announce their expansion ... office in Singapore . The company are delighted ... as Co-Director of the Singapore based entity. ...
(Date:2/24/2017)... YORK , Feb. 23, 2017  The ... 330.6 million by 2021 from USD 275.9 million ... Read the full report: http://www.reportlinker.com/p04718602-summary/view-report.html ... increasing spending on pharmaceutical R&D, and growth in ... driving the market growth for particle counters. On ...
Breaking Medicine Technology: