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Prepublished online as a Blood First Edition Paper on March 6, 2003; DOI 10.1182/blood-2002-09-2831.

Submitted September 19, 2002
Accepted February 11, 2003
Lack of NB1 GP (CD177 / HNA-2a) gene transcription in NB1 GP-negative neutrophils from NB1 GP-expressing individuals and association of low expression with NB1 gene polymorphisms
Jens Wolff, Cornelia Brendel, Ludger Fink, Rainer M Bohle, Karin Kissel, and Juergen Bux*
Institute for Clinical Immunology and Transfusion Medicine, University of Giessen, Giessen, Germany
Department of Hematology, University of Marburg, Marburg, Germany
Institute for Pathology, University of Giessen, Giessen, Germany
* Corresponding author; email: Juergen.Bux{at}immunologie.med.uni-giessen.de.
The human neutrophil NB1 glycoprotein (NB1 GP, HNA-2a, CD177) has gained clinical importance being involved in TRALI reactions and immune neutropenias. The NB1 GP shows the unique feature of being expressed only on a neutrophil subpopulation. Recently, we identified splicing defects responsible for a NB1 GP deficiency. In this study, we have investigated the molecular basis of the heterogeneous expression of NB1 GP by separating the two neutrophil subpopulations using immunofluorescence followed by single cell picking or by fluorescence-activated cell sorter, respectively. We found a lack of NB1 mRNA in the NB1 GP-negative cells that remained constant even after G-CSF administration. Comparing the cDNA sequences of donors with a large (> 60%) and those with a small (< 40%) NB1 GP-expressing subpopulation, we found six polymorphisms. Three of them were significantly associated with a small NB1 GP-expressing subpopulation indicating a genetic basis for NB1 GP non-expression.

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