Characterisation of the Novel HLA-C*07:1223 Allele by Sequencing-Based Typing

Area of Science:

• Immunogenetics
• Molecular Biology

Background:

• Human Leukocyte Antigen (HLA) genes are crucial for immune response.
• Specific HLA alleles, such as HLA-C, play a significant role in immune system function and disease susceptibility.
• Accurate characterization of HLA alleles is essential for transplantation and disease research.

Purpose of the Study:

• To identify and describe the specific genetic difference between two closely related HLA-C alleles: HLA-C*07:1223 and HLA-C*07:997.
• To precisely locate the nucleotide variation within the HLA-C gene sequence.

Main Methods:

• Comparative sequence analysis of HLA-C*07:1223 and HLA-C*07:997.
• Focus on exon 3, specifically codon 147, to pinpoint nucleotide differences.

Main Results:

• A single nucleotide substitution was identified in codon 147 of exon 3.
• This substitution is the sole distinguishing genetic feature between HLA-C*07:1223 and HLA-C*07:997.

Conclusions:

• The genetic basis for the distinction between HLA-C*07:1223 and HLA-C*07:997 is a single nucleotide change at codon 147 in exon 3.
• This finding refines the understanding of HLA-C allele polymorphism and aids in accurate HLA typing.