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Cost-efficient high-throughput HLA typing by MiSeq amplicon sequencing.

Vinzenz Lange, Irina Böhme1, Jan Hofmann

  • 1DKMS Life Science Lab, Fiedlerstrasse 34, 01307 Dresden, Germany. boehme@dkms-lab.de.

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We developed a new, cost-effective workflow for high-resolution Human Leukocyte Antigen (HLA) typing using next-generation sequencing (NGS). This method improves donor registry efficiency and accuracy for hematopoietic stem cell transplantation.

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Area of Science:

  • Immunogenetics
  • Molecular Biology
  • Biotechnology

Background:

  • Successful unrelated hematopoietic stem cell transplantation relies on precise Human Leukocyte Antigen (HLA) allele matching.
  • Donor registries face resource limitations, often necessitating compromises between typing resolution and cost.
  • Advancements in next-generation sequencing (NGS) offer opportunities to overcome these limitations.

Purpose of the Study:

  • To develop a low-cost, high-resolution HLA typing workflow utilizing recent NGS improvements.
  • To enhance the efficiency and accuracy of HLA typing for unrelated donor registries.

Main Methods:

  • A three-step workflow involving PCR amplification of key HLA exons (2 and 3) on microfluidic chips.
  • Direct incorporation of Illumina sequencing adapters and sample-specific tags during PCR.
  • High-throughput sequencing of pooled samples (384 per run) followed by streamlined data analysis using "neXtype" software.

Main Results:

  • The workflow successfully typed 1140 samples across 6 HLA loci with high throughput (12,000 samples/week capacity).
  • All results were concordant with Sanger sequencing, confirming error-free typing of over 6000 HLA loci.
  • The developed method provides high-resolution HLA typing exceeding current Sanger standards.

Conclusions:

  • The presented workflow offers a cost-efficient alternative to Sanger sequencing for high-throughput HLA typing.
  • This NGS-based approach enhances donor registration by providing superior resolution at a reduced cost.
  • The method is validated and ready for routine operation in donor registries.