HLA-A Confers an HLA-DRB1 Independent Influence on the Risk of Multiple Sclerosis

Overview

Journal PLoS One

Specialties General Medicine
Science

Date 2007 Jul 27

PMID 17653284

Citations 71

Authors

Boel Brynedal

Kristina Duvefelt

Gudrun Jonasdottir

Izaura M Roos

Eva Akesson

Juni Palmgren

Jan Hillert

Affiliations

Soon will be listed here.

Abstract

A recent high-density linkage screen confirmed that the HLA complex contains the strongest genetic factor for the risk of multiple sclerosis (MS). In parallel, a linkage disequilibrium analysis using 650 single nucleotide polymorphisms (SNP) markers of the HLA complex mapped the entire genetic effect to the HLA-DR-DQ subregion, reflected by the well-established risk haplotype HLA-DRB1*15,DQB1*06. Contrary to this, in a cohort of 1,084 MS patients and 1,347 controls, we show that the HLA-A gene confers an HLA-DRB1 independent influence on the risk of MS (P = 8.4x10(-10)). This supports the opposing view, that genes in the HLA class I region indeed exert an additional influence on the risk of MS, and confirms that the class I allele HLA-A*02 is negatively associated with the risk of MS (OR = 0.63, P = 7x10(-12)) not explained by linkage disequilibrium with class II. The combination of HLA-A and HLA-DRB1 alleles, as represented by HLA-A*02 and HLA-DRB1*15, was found to influence the risk of MS 23-fold. These findings imply complex autoimmune mechanisms involving both the regulatory and the effector arms of the immune system in the triggering of MS.

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