Is neuromyelitis optica associated with human leukocyte antigen?

Area of Science:

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

Background:

• Investigating the distinct pathological entities of Multiple Sclerosis (MS) and Neuromyelitis Optica (NMO).
• Examining shared human leukocyte antigen (HLA) predisposition patterns between MS and NMO patients.

Purpose of the Study:

• To determine the association between NMO susceptibility and HLA class I or class II loci in Caucasian populations.
• To differentiate genetic predispositions between NMO and MS.

Main Methods:

• Genotyping of HLA class I and class II loci in 39 Caucasian NMO patients and controls.
• High-resolution allelic frequency reporting.
• Case-control study comparing NMO patients with French Caucasian MS and healthy groups.

Main Results:

• HLA-DQA1, DQB1, and HLA-DRB1 DR2 allele frequencies in NMO patients were intermediate between healthy controls and MS patients.
• The DPB1*0501 allele was not elevated in NMO patients compared to healthy controls.
• HLA-DRB1 allele distribution differentiated NMO-IgG-positive patients from healthy controls (P = 0.01), while NMO-IgG-negative patients showed an HLA II pattern similar to MS patients (P = 0.01).

Conclusions:

• No association found between DPB1*0501 allele and NMO in Caucasian patients, contrary to findings in Asian opticospinal MS.
• NMO-IgG-positive patients may represent a distinct genetic susceptibility group within NMO.