title: Interaction of loci within the HLA region influences multiple sclerosis course in the Sardinian population.
abstract: We examined the influence of alleles at the HLA loci, previously found to be associated with multiple sclerosis (MS) in Sardinia, on the clinical course of the disease in 835 relapsing (R) and 100 primary progressive (PP) patients. Multivariate analysis was carried out on predisposing 0301 or non-associated DPB1 alleles, susceptible or non-associated DRB1-DQB1 haplotypes, both predisposing and non-predisposing, and negatively and non-negatively associated D6S1683 alleles, taking interaction between them into account. Intra-patient analysis showed that the presence of the susceptible or protective D6S1683 allele interacting with predisposing DP 0301 modulated risk of PP disease. These findings suggest that a locus telomeric to HLA class I exerts an effect on alleles at the DPB1 locus in modulating disease course.
authors.affiliation: Centro Sclerosi Multipla, Ospedale Binaghi, Cagliari, Italy. gmarrosu@unica.it
authors.forename: M G
authors.initials: MG
authors.lastname: Marrosu
authors.forename: E
authors.initials: E
authors.lastname: Cocco
authors.forename: G
authors.initials: G
authors.lastname: Costa
authors.forename: M R
authors.initials: MR
authors.lastname: Murru
authors.forename: C
authors.initials: C
authors.lastname: Mancosu
authors.forename: R
authors.initials: R
authors.lastname: Murru
authors.forename: M
authors.initials: M
authors.lastname: Lai
authors.forename: C
authors.initials: C
authors.lastname: Sardu
authors.forename: P
authors.initials: P
authors.lastname: Contu
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000483:Alleles; D002648:Child; D002875:Chromosomes; D016001:Confidence Intervals; D005260:Female; D005787:Gene Frequency; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006680:HLA Antigens / Q000235:genetics*; D006683:HLA-DQ Antigens; D059866:HLA-DQ beta-Chains; D006684:HLA-DR Antigens; D059811:HLA-DRB1 Chains; D006801:Humans; D007558:Italy / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D009103:Multiple Sclerosis / Q000145:classification / Q000235:genetics*; D015999:Multivariate Analysis; D016017:Odds Ratio
chemical_list: D006680:HLA Antigens; D006683:HLA-DQ Antigens; D059866:HLA-DQ beta-Chains; C069051:HLA-DQB1 antigen; D006684:HLA-DR Antigens; D059811:HLA-DRB1 Chains