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Interaction between HLA-DRB1-DQB1 haplotypes in Sardinian multiple sclerosis population.

Eleonora Cocco¹, Raffaele Murru, Gianna Costa

¹Multiple Sclerosis Center, Department of Public Health and Clinical and Molecular Medicine, University of Cagliari, Cagliari, Italy.

|April 18, 2013

Summary

This study investigated human leukocyte antigen (HLA)-DRB1-DQB1 gene variants in Sardinian multiple sclerosis (MS) patients. Specific gene variants were identified that increase susceptibility or provide protection against developing MS.

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Personalized Peptide Arrays for Detection of HLA Alloantibodies in Organ Transplantation

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Published on: September 6, 2017

Area of Science:

Immunogenetics
Neuroimmunology
Human Genetics

Background:

Multiple sclerosis (MS) is a complex autoimmune disease with a significant genetic component.
Human leukocyte antigen (HLA) genes, particularly HLA-DRB1 and HLA-DQB1, are strongly associated with MS susceptibility.
Understanding specific HLA haplotypes and their interactions is crucial for elucidating MS pathogenesis.

Purpose of the Study:

To analyze the interaction between HLA-DRB1-DQB1 haplotypes and their association with multiple sclerosis (MS) risk in the Sardinian population.
To identify specific genotypes conferring susceptibility or protection against MS.
To explore the functional implications of these genetic associations on antigen presentation.

Main Methods:

A case-control study involving 2,555 Sardinian MS patients and 1,365 healthy controls.
Analysis of HLA-DRB1-DQB1 haplotypes and their genotypic interactions.
Phylogenetic tree construction, sequence alignment, and molecular dynamics simulations.

Main Results:

Four HLA-DRB1-DQB1 haplotypes (*13:03-*03:01, *04:05-*03:01, *15:01-*06:02, *03:01-*02:01) were found to confer susceptibility to MS.
Several haplotypes (*11, *16:01-*05:02, *14:01-4-*05:031, *15:02-*06:01) showed a protective effect.
Relative predispositional effect analysis confirmed susceptibility for *08 and *04 haplotypes.
Interactions between haplotypes were classified as neutral or negative.
Sequence analysis identified key amino acid positions (near P4 and P9 pockets) and molecular dynamics pinpointed position 70 in relation to MBP 85-99 peptide binding.

Conclusions:

Specific HLA-DRB1-DQB1 haplotypes significantly influence MS risk in the Sardinian population.
The identified genetic variations may affect antigen presentation mechanisms, contributing to MS susceptibility.
Functional analysis of specific amino acid positions provides insights into the molecular basis of MS pathogenesis related to HLA alleles.