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J. Exp. Med.,
Volume 189, Number 11, June 7, 1999 1847-1852
By
From the Laboratory of Host Defenses, National Institute of Allergy and Infectious Diseases, National
Institutes of Health, Bethesda, Maryland 20892
Neutrophil-specific granule deficiency (SGD) is a rare disorder characterized by recurrent pyogenic infections, defective neutrophil chemotaxis and bactericidal activity, and lack of neutrophil secondary granule proteins. CCAAT/enhancer binding protein (C/EBP)
, a member of
the leucine zipper family of transcription factors, is expressed primarily in myeloid cells, and its
knockout mouse model possesses distinctive defects, including a lack of neutrophil secondary
granule proteins. Sequence analysis of the genomic DNA of a patient with SGD revealed a
five-basepair deletion in the second exon of the C/EBP
locus. The predicted frame shift results in a truncation of the 32-kD major C/EBP
isoform, with loss of the dimerization domain, DNA binding region, and transcriptional activity. The multiple functional defects observed in these early neutrophil progenitor cells, a consequence of C/EBP
deficiency, define
SGD as a defect in myelopoiesis and establish the requirement for C/EBP
for the promyelocyte-myelocyte transition in myeloid differentiation.
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