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:10/13/2017)... (PRWEB) , ... October 13, 2017 , ... “The Journey: ... faced every danger possible to save lost souls in the Philippines. “The Journey: From ... Carole is a dedicated teacher of the Bible. She has taught all ages and ...
(Date:10/12/2017)... ... October 12, 2017 , ... CitiDent and ... apnea using cutting-edge Oventus O2Vent technology. As many as 18 million Americans ... frequent cessation in breathing. Oral appliances can offer significant relief to about 75 ...
(Date:10/12/2017)... ... October 12, 2017 , ... IsoComforter, Inc. ( https://isocomforter.com ), one ... an innovative new design of the shoulder pad. The shoulder pad provides optimal ... controlling your pain while using cold therapy. By utilizing ice and water that is ...
(Date:10/12/2017)... ... October 12, 2017 , ... Information about the ... to develop to enable prevention of a major side effect of chemotherapy in ... in pediatric patients. For cisplatin, hearing loss is FDA listed on-label as a ...
(Date:10/12/2017)... ... ... Leading pediatric oncology experts at Children’s National Health System will join ... International Society of Paediatric Oncology (SIOP) Oct. 12-15. Chaired by Jeffrey Dome, ... at Children’s National, and Stephen P. Hunger, M.D., Chief of the Division of ...
Breaking Medicine News(10 mins):
(Date:10/2/2017)... 2, 2017 Halo Labs announces the European launch of ... the HORIZON at MIBio 2017 in Cambridge, U.K ... particulate matter in biopharmaceutical samples with unprecedented speed and sensitivity while ... technique Backgrounded Membrane Imaging. ... HORIZON subvisible particle analysis system ...
(Date:9/28/2017)... 28, 2017 Cohen Veterans Bioscience and Early ... of wearable and home sensors for real-time monitoring of ... Foundation, a nonprofit organization focused on disruptive health solutions ... affordable analytical system to record and integrate behavioral, cognitive, ... ...
(Date:9/25/2017)... --  Montrium , an industry leader in powerful ... Trial Master Files & Inspection Readiness Conference ( ... Services has selected eTMF Connect to ... a leading European contract research organization (CRO), will ... enable greater collaboration with sponsors, improve compliance and ...
Breaking Medicine Technology: