Development of a high-resolution typing method for SLA-3, swine MHC class I antigen 3

Area of Science:

• Immunogenetics
• Molecular Biology
• Comparative Genomics

Background:

• The Swine Leukocyte Antigen (SLA) complex plays a crucial role in the adaptive immune response in pigs.
• High-resolution typing of SLA genes is essential for understanding disease resistance and breeding strategies.
• Previous studies have characterized SLA-1 and SLA-2, but comprehensive typing of SLA-3 was needed.

Purpose of the Study:

• To develop and validate a high-resolution typing method for the swine leukocyte antigen 3 (SLA-3) gene.
• To characterize the allelic diversity of SLA-3 across various pig breeds and cell lines.
• To facilitate integrated analysis of major SLA genes for immunogenetic studies.

Main Methods:

• Locus-specific genomic PCR amplification of the SLA-3 gene.
• Direct sequencing of PCR amplicons for allele identification.
• Typing of 292 individuals from nine pure breeds, one cross-breed, and six cell lines.

Main Results:

• A total of 21 SLA-3 alleles were identified, including four novel alleles.
• Allelic diversity of SLA-3 was found to be lower compared to SLA-1 and SLA-2.
• The SLA-3*04:01 allele was the most prevalent, found in seven out of nine breeds.

Conclusions:

• The developed typing method provides high-resolution characterization of SLA-3 alleles.
• The findings contribute to a comprehensive understanding of SLA polymorphism in pigs.
• This method enables combined analysis of major SLA genes, crucial for correlating immunogenetics with disease resistance.