alexa HLA-A locus allelic dropout in Sanger sequence-based typing to the single nucleotide polymorphism of exon 1.
Immunology

Immunology

Immunotherapy: Open Access

Author(s): Zhang W, He Y, Wang W, Han Z, He J

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The DNA-based method is used widely for HLA genotyping in routine work, but some allele may be dropout in the genotyping procedure. Here, we reported a case with HLA-A allele dropout in the Sanger PCR-SBT test. The initial PCR-SBT method with a commercial agent kit was not characterized, and the result of Luminex technology indicated the dropout as a HLA-A*02 allele. Subsequently, the sequences of exons 2-4 were fully matched with the A*02:07 and A*11:01:01 by allele group-specific primer amplification PCR-SBT. On further analysis, a novel allele A*02:07:07 was identified, which has one nucleotide difference from A*02:07:01 at position 6 C>G of exon 1. According to the sequencing for 5'-UTR to 3'-UTR, the novel single nucleotide polymorphism of exon 1 was contributed to HLA-A locus allele dropout in the sample. Our results indicated multiplatform analysis is necessary when a conclusive HLA type cannot be determined by a single methodology.
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This article was published in Int J Immunogenet and referenced in Immunotherapy: Open Access

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