HLA-Dw1 and BfF as protective markers in multiple sclerosis

Area of Science:

• Immunogenetics
• Neurology
• Human Leukocyte Antigen (HLA) system

Background:

• Multiple sclerosis (MS) is a complex neurological disease with a suspected genetic component.
• Human Leukocyte Antigen (HLA) antigens, particularly Dw1 and Dw2, have shown altered frequencies in MS patients.
• Properdin factor B (BF) allotypes are polymorphic proteins encoded within the Major Histocompatibility Complex (MHC) region, which also contains HLA genes.

Purpose of the Study:

• To investigate the frequencies of Properdin factor B (BF) allotypes in multiple sclerosis (MS) patients and healthy controls.
• To examine the association between BF allotypes and specific Human Leukocyte Antigen (HLA) antigens (Dw1 and Dw2) in relation to MS.
• To explore the potential role of genetic factors in the HLA region as a resistance factor for MS.

Main Methods:

• Genotyping of Properdin factor B (BF) allotypes in 54 MS patients and 58 healthy controls.
• Analysis of Human Leukocyte Antigen (HLA)-Dw1 and HLA-Dw2 antigen frequencies in the same cohorts.
• Statistical analysis to determine associations between BF allotypes, HLA antigens, and MS status.

Main Results:

• The SS genotype frequency was 76% in MS patients and 63% in controls (not statistically significant).
• F types (FS + FF) showed a strong association with HLA-Dw1 in control subjects (P < 0.0014).
• Neither SS nor F-containing BF genotypes were significantly associated with HLA-Dw2 in MS patients.

Conclusions:

• The study suggests a potential link between Properdin factor B (BF) allotypes and Human Leukocyte Antigen (HLA) genes in the context of multiple sclerosis (MS).
• The observed associations, particularly the link between F types and HLA-Dw1 in controls, support the hypothesis of a hypothetical MS resistance factor located within the HLA gene area.