HLA-class II haplotypes and Autism Spectrum Disorders

Area of Science:

• Immunogenetics
• Neurodevelopmental Disorders
• Human Leukocyte Antigen (HLA) System

Background:

• Autism spectrum disorders (ASD) are associated with infections and autoimmunity.
• The human leukocyte antigen (HLA) system plays a crucial role in immune regulation and has been implicated in ASD.
• Further investigation into the relationship between HLA genetic diversity and ASD is warranted.

Purpose of the Study:

• To investigate the distribution of HLA class II-DRB1 and DQB1 alleles, genotypes, and haplotypes in individuals with ASD compared to healthy controls.
• To identify specific HLA genetic markers associated with ASD.
• To explore the potential link between identified HLA haplotypes and clinical dimensions of ASD.

Main Methods:

• A case-control study design was employed.
• Genotyping of HLA class II-DRB1 and DQB1 was performed on 474 ASD patients and 350 healthy controls using Luminex-based SSO technology.
• Statistical analyses included comparisons of genotype and allele frequencies, and haplotype analysis.

Main Results:

• The HLA-DRB1*11-DQB1*07 haplotype was significantly more prevalent in ASD patients (Pc=0.001), potentially linking to gastro-intestinal (GI) inflammation.
• The HLA-DRB1*17-DQB1*02 haplotype was more frequent in healthy controls (Pc=0.002), suggesting a protective role.
• Higher ASD social and non-verbal functioning scores were associated with the HLA-DRB1*11-DQB1*07 haplotype.

Conclusions:

• The study supports the involvement of HLA genetics in ASD.
• Specific HLA haplotypes may influence susceptibility or provide protection against ASD.
• Findings suggest a potential role for HLA in ASD, possibly through GI and gut-brain axis dysregulation.