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A new allele, HLA-DRB4*010304
1Transplantation Immunology Service, S. Giovanni Hospital, Turin, Italy. mfasono@molinette.piemonte.it
Tissue Antigens
|July 16, 2003
Summary
A new human leukocyte antigen (HLA) allele, DRB4*010304, was identified during routine HLA typing for a liver transplant patient. This novel allele differs from a known allele by a single nucleotide change in exon 2.
Area of Science:
- Immunogenetics
- Molecular Biology
- Transplantation Science
Background:
- Human Leukocyte Antigen (HLA) typing is crucial for transplantation compatibility.
- The DRB4 gene locus plays a significant role in immune responses and transplantation outcomes.
- Accurate HLA allele identification is essential for minimizing transplant rejection.
Purpose of the Study:
- To report the discovery and characterization of a novel DRB4*01 allele.
- To document the specific genetic variation defining the new allele.
- To contribute to the comprehensive catalog of human HLA polymorphisms.
Main Methods:
- Routine DNA-based HLA typing was performed on a patient awaiting liver transplantation.
- High-resolution DNA sequencing was employed to confirm and characterize the novel allele.
- Comparative sequence analysis was conducted against known HLA allele sequences.
Main Results:
- A novel DRB4*01 allele, designated DRB4*010304, was identified.
- The new allele shares sequence identity with DRB4*01030101 at exon 2.
- A single nucleotide substitution (T instead of C at position 216) distinguishes DRB4*010304 from DRB4*01030101.
Conclusions:
- The identification of DRB4*010304 expands the known HLA allele repertoire.
- This finding underscores the importance of high-resolution typing for detecting rare HLA variants.
- Accurate characterization of novel alleles is vital for immunogenetic databases and clinical applications in transplantation.