A new HLA-C allele: Cw*0819

Area of Science:

• Immunogenetics
• Molecular biology
• Human leukocyte antigen (HLA) system

Background:

• The human leucocyte antigen (HLA) system plays a crucial role in immune response and transplantation.
• Polymorphisms within HLA genes contribute to diverse immune capabilities and disease associations.
• Accurate characterization of novel HLA alleles is essential for immunological studies and clinical applications.

Purpose of the Study:

• To report the identification and initial characterization of a novel human leucocyte antigen (HLA) allele, HLA-Cw*0819.
• To detail the specific genetic and amino acid differences between HLA-Cw*0819 and a related known allele, HLA-Cw*0802.

Main Methods:

• Nucleotide sequencing of exons encoding the alpha-1 and alpha-2 domains of the HLA-C gene.
• Comparison of the obtained sequence with known HLA allele sequences in the IMGT/HLA database.
• Analysis of predicted amino acid changes resulting from nucleotide substitutions.

Main Results:

• The novel allele HLA-Cw*0819 was identified.
• HLA-Cw*0819 differs from HLA-Cw*0802 by two nucleotide substitutions.
• These substitutions result in a non-synonymous change at amino acid position 99 (tyrosine to phenylalanine) and a synonymous substitution.

Conclusions:

• The identification of HLA-Cw*0819 expands the known allelic diversity of the HLA-C locus.
• The amino acid change at position 99 may have implications for peptide binding and T-cell recognition.
• Further functional studies are warranted to understand the immunological impact of this novel HLA allele.