Microarray beads for identifying blood group single nucleotide polymorphisms

Francesca Drago, Katerina Karpasitou, Francesca Poli

Research output: Contribution to journalArticlepeer-review


We have developed a high-throughput system for single nucleotide polymorphism (SNP) genotyping of alleles of diverse blood group systems exploiting Luminex technology. The method uses specific oligonucleotide probes coupled to a specific array of fluorescent microspheres and is designed for typing Jka/Jkb , Fya/Fyb , S/s, K/k, Kpa/Kpb , Jsa/Jsb , Co a/Cob and Lua/Lub alleles. Briefly, two multiplex PCR reactions (PCR I and PCR II) according to the laboratory specific needs are set up. PCR I amplifies the alleles tested routinely, namely Jka/Jkb , Fya/Fyb , S/s, and K/k. PCR II amplifies those alleles that are typed less frequently. Biotinylated PCR products are hybridized in a single multiplex assay with the corresponding probe mixture. After incubation with R-phycoerythrinconjugated streptavidin, the emitted fluorescence is analyzed with Luminex 100. So far, we have typed more than 2,000 subjects, 493 of whom with multiplex assay, and there have been no discrepancies with the serology results other than null and/or weak phenotypes. The cost of consumables and reagents for typing a single biallelic pair per sample is less than EUR 3.-, not including DNA extraction costs. The capability to perform multiplexed reactions makes the method markedly suitable for mass screening of red blood cell alleles. This genotyping approach represents an important tool in transfusion medicine.

Original languageEnglish
Pages (from-to)157-160
Number of pages4
JournalTransfusion Medicine and Hemotherapy
Issue number3
Publication statusPublished - Jun 2009


  • Blood group
  • Micrarray beads
  • Single nucleotide polymorphism
  • SNPs

ASJC Scopus subject areas

  • Hematology
  • Immunology and Allergy


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