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Weak D type 2 is the most prevalent weak D type in Portugal

Författare

  • F Araujo
  • MJ Rodrigues
  • F Monteiro
  • T Chabert
  • G Tavares
  • G Sousa
  • Jill Storry
  • JE Guimaraes

Summary, in English

The weak D phenotype is the most common D variant, with a frequency of 0.2-1% in Caucasian individuals. There are several weak D types, with different frequencies in European countries, which may pose serologic problems and have the potential for alloimmunization. Samples from Portuguese individuals were tested for RhD by two or three distinct monoclonal and oligoclonal antisera, in direct agglutination tests. When discrepant results were observed, samples were tested with panels of monoclonal anti-D by LISS-indirect antigobulin test. Cases that reacted weakly with IgM but positive with IgG anti-D were analysed by PCR-sequence-specific primers and real-time PCR. Ninety-nine samples were referred after being characterized as weak D. This genotype was recognized, with a preponderance of weak D type 2 (63.6%) over type 1 (16.2%) and 3 (14.1%). The high incidence of weak D type 2 in our population is in marked contrast to studies performed in other European populations and might be due to our sample selection criteria or ethnic variation. There are advantages in genotyping serologically depressed D samples to avoid the waste of D-negative RBC units and the use of immunoglobulin in pregnant women, who have no risk of alloimmunization.

Publiceringsår

2006

Språk

Engelska

Sidor

63-67

Publikation/Tidskrift/Serie

Transfusion Medicine

Volym

16

Issue

1

Dokumenttyp

Artikel i tidskrift

Förlag

Wiley-Blackwell

Ämne

  • Hematology

Nyckelord

  • alloimmunization
  • D variants
  • real-time PCR
  • weak D

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0958-7578