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Updated: Mar 26, 2026

Wild-type Blocking PCR Combined with Direct Sequencing as a Highly Sensitive Method for Detection of Low-Frequency Somatic Mutations
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HLA typing: Conventional techniques v. next-generation sequencing.

Juanita Mellet1, Clive M Gray, Michael S Pepper

  • 1Department of Immunology, Institute for Cellular and Molecular Medicine, and South African Medical Research Council Extramural Unit for Stem Cell Research and Therapy, School of Medicine, Faculty of Health Sciences, University of Pretoria, Pretoria, South Africa. juanitamellet@yahoo.co.uk.

South African Medical Journal = Suid-Afrikaanse Tydskrif Vir Geneeskunde
|January 22, 2016
PubMed
Summary
This summary is machine-generated.

Next-generation sequencing (NGS) offers limited additional value over conventional methods for Human Leukocyte Antigen (HLA) typing in South Africa. For unrelated hematopoietic stem cell transplantation (HSCT) and cord blood banking, NGS may not be cost-effective at this stage.

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Area of Science:

  • Immunogenetics
  • Molecular Biology
  • Genomics

Background:

  • South African population has numerous Human Leukocyte Antigen (HLA) complex polymorphisms, complicating unrelated hematopoietic stem cell transplantation (HSCT).
  • Next-generation sequencing (NGS) presents potential advantages over traditional HLA typing methods.

Purpose of the Study:

  • To assess the added value of NGS compared to conventional techniques for HSCT and cord blood banking in South Africa.
  • Evaluate NGS performance for HLA genotyping in the South African context.

Main Methods:

  • Performed HLA genotyping using NGS on 20 previously typed samples.
  • Compared NGS results with conventional HLA typing methods.

Main Results:

  • NGS accurately genotyped 98.5% of five key HLA loci.
  • Inclusion of additional exons yielded similar accuracy (98%).

Conclusions:

  • The added value of NGS over conventional methods for HLA typing in South Africa is minimal.
  • NGS may not be cost-effective for HSCT and cord blood banking in South Africa currently, unless implemented on a large scale.