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Related Experiment Videos

Weak D alleles express distinct phenotypes.

F F Wagner1, A Frohmajer, B Ladewig

  • 1Abteilung Transfusionsmedizin, Universitätsklinikum Ulm and DRK-Blutspendedienst Baden-Württemberg, Institut Ulm, Ulm, Germany.

Blood
|February 7, 2001
PubMed
Summary
This summary is machine-generated.

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Most weak D phenotypes have altered RhD antigens, unlike previous assumptions. Some rare weak D types pose an anti-D immunization risk, necessitating improved transfusion strategies for weak D patients.

Area of Science:

  • Immunology
  • Hematology
  • Genetics

Background:

  • Weak D phenotypes result from various RHD alleles encoding abnormal RhD proteins.
  • This diversity suggests potential for distinct serologic phenotypes and anti-D immunizations in weak D individuals.

Purpose of the Study:

  • To investigate the immunohematologic characteristics of 18 weak D types.
  • To determine if weak D phenotypes correlate with RhD epitope models and anti-D immunization risk.

Main Methods:

  • Characterization of 6 new RHD alleles (D category III type IV, DIM, weak D types 4.1, 4.2.1, 4.2.2, 17).
  • Immunohematologic analysis using agglutination and flow cytometry with over 50 monoclonal anti-D antibodies.
  • Development of a Rhesus D similarity index to quantify alterations in D antigens.

Related Experiment Videos

Main Results:

  • Agglutination patterns for DIM, D(III) type IV, and D(IV) type III correlated with D epitope models; weak D types did not.
  • Weak D types exhibited variable RhD antigen densities (70-4000/cell) and qualitatively distinct D antigens via flow cytometry.
  • The Rhesus D similarity index differentiated normal D from partial D phenotypes, including D category III.
  • Alterations in some rare weak D types were comparable to partial D types known to cause anti-D immunization.
  • Four of six cases of anti-D in weak D patients were auto-anti-D.

Conclusions:

  • Contrary to prior beliefs, most weak D types, including common ones, possess altered D antigens.
  • Certain weak D types present a clinically significant risk for anti-D immunization.
  • These findings support the development of improved transfusion strategies for weak D patients.