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Personalized Peptide Arrays for Detection of HLA Alloantibodies in Organ Transplantation
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[Identifying and sequence analysis of HLA-B*2736].

Zhen Li1, Hong-Yan Zou, Chao-Peng Shao

  • 1Shenzhen Institute of Transfusion Medicine, Shenzhen Blood Center, Shenzhen 518035, China. shallylizhen@yahoo.com.cn

Yi Chuan = Hereditas
|November 9, 2007
PubMed
Summary

A novel Human Leukocyte Antigen B allele, identified in a Chinese Han individual, was characterized through sequencing. This new HLA-B allele was confirmed as an extension of B*2736.

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Area of Science:

  • Immunogenetics
  • Molecular Biology
  • Human Genetics

Background:

  • Human Leukocyte Antigen (HLA) B alleles play a crucial role in immune responses.
  • Accurate HLA typing is essential for transplantation and disease association studies.
  • Novel alleles require detailed characterization to expand the HLA database.

Purpose of the Study:

  • To identify and characterize a previously unknown HLA-B allele detected in a Chinese Han individual.
  • To determine the genetic differences between the novel allele and known HLA-B*27 alleles.
  • To submit the novel allele sequence for official nomenclature and database inclusion.

Main Methods:

  • Flow cytometry with sequence-specific oligonucleotide probes (FLOW-SSO PCR-SSP) and heterozygous sequence-based typing (SBT) were employed for initial detection.

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  • Allele-specific primers were used to amplify exons 2-5, including introns 2-4, of the novel HLA-B*27 allele.
  • Bidirectional sequencing was performed to identify nucleotide differences compared to HLA-B*270401 and other related alleles.

    • Main Results:

    • A novel HLA-B allele, distinct from HLA-B*270401, was identified with 10 nucleotide changes in exons 3-4 and specific mutations/deletions in introns 2-4.
    • Intron 2 showed homology with HLA-B*2706, while introns 3 and 4 shared sequences with HLA-B*070201.
    • The novel allele sequence (1,815 bp) was submitted to GenBank (accession number DQ915176).

    Conclusions:

    • The novel HLA-B allele represents a new variant within the HLA-B*27 family.
    • The genetic characterization provides valuable data for the HLA database and immunogenetic research.
    • The allele was officially confirmed as an extension of B*2736 by the WHO Nomenclature Committee.