The human major histocompatibility complex (MHC) class II region is associated with genetic susceptibility to multiple sclerosis (MS). Roles for HLA class I loci have been supported in several case-control studies, but this methodology does not consider the known linkage disequilibrium (LD) between class I and II loci. In 1258 individuals from 294 MS families, we analysed class I and II interac...

HSV-1 establishes life-long latency that can result in clinical relapses or in asymptomatic virus shedding. Although virtually all adults have been exposed to HSV-1, the clinical course varies remarkably. Genetic host variability could be related to this clinical diversity. In this study, we analyzed the contribution of gene families in chromosomes 1, 6, 12, and 19, which encode key regulators ...

In unrelated marrow transplantation, the benefit of matching class II HLA-DRB1 and DQB1 alleles of the donor and recipient is well documented. Little is known about the clinical relevance of matching for class I HLA-A, B, and C alleles. We used DNA-amplification methods to identify the HLA-A, B, and C alleles of 300 patients and their donors. The incidence of graft failure was correlated with m...

Previous studies in Caucasians with progressive systemic sclerosis (PSS) have suggested associations of antitopoisomerase I (antitopo I) autoantibodies with either serologically defined HLA-DR2 or DR5. To better define class II HLA associations with the antitopo I response, 161 PSS patients (132 Caucasians and 29 American blacks) were studied for antitopo I autoantibodies by immunodiffusion and...

Background: The origin and function of human leukocyte antigen (HLA) class I molecules on platelets are still highly arguable. Given the differences in the results of the previous studies in this regard, the lack of research in recent years, and the clinical importance of HLA class I molecules, the absorption capacity of platelets for soluble HLA class I molecules was studied in this investigat...

HLA-G has a relevant role in immune response regulation. The overall structure of the HLA-G coding region has been maintained during the evolution process, in which most of its variable sites are synonymous mutations or coincide with introns, preserving major functional HLA-G properties. The HLA-G promoter region is different from the classical class I promoters, mainly because (i) it lacks reg...

MHC class I polymorphisms are known to influence outcomes in a number of infectious diseases, cancers, and inflammatory diseases. Human MHC class I H chains are encoded by the HLA-A, HLA-B, and HLA-C genes. These genes are highly polymorphic, with the HLA-B locus being the most variable. Each HLA class I protein binds to a distinct set of peptide Ags, which are presented to CD8(+) T cells. HLA-...

The HLA (human major histocompatibility complex, or MHC) region includes three types of class I MHC genes: (1) class Ia loci (HLA-A, -B, and -C), which are highly expressed and polymorphic; (2) class Ib loci, which have much reduced expression and polymorphism; and (3) unexpressed class I pseudogenes. Phylogenetic analysis suggests that both class Ib loci and class I pseudogenes arose by duplic...

1. Abstract 2. Introduction 3. MHC Class I and II Molecules 3.1. Function of MHC Class I and Class II molecules 3.2. Structure of MHC Class I and Class II molecules 3.3. Antigen binding by MHC Class I and Class II molecules 3.4. MHC polymorphism on peptide binding 3.5. Antigen presentation by MHC Class II molecules 4. MHC and disease associations 4.1. Associations between MHC polymorphism and d...

HLA-B*13:01 is associated with dapsone (DDS)-induced hypersensitivity and it has been shown that CD4+ CD8+ T cells are activated by DDS its nitroso metabolite (DDS-NO). However, there a need to define the importance of HLA association in disease pathogenesis. Thus, DDS-NO-specific cell clones (TCC) were generated from hypersensitive patients expressing assessed for phenotype function, HLA-allel...