ward-novelpointmutation-1999.pdf (503.66 kB)
Novel point mutation in the extracellular domain of the granulocyte colony-stimulating factor (G-CSF) receptor in a case of severe congenital neutropenia hyporesponsive to G-CSF treatment
journal contributionposted on 1999-08-16, 00:00 authored by Alister WardAlister Ward, Y M van Aesch, J Gits, A M Schelen, J P de Koning, D van Leeuwen, M H Freedman, I P Touw
Severe congenital neutropenia (SCN) is a heterogeneous condition characterized by a drastic reduction in circulating neutrophils and a maturation arrest of myeloid progenitor cells in the bone marrow. Usually this condition can be successfully treated with granulocyte colony-stimulating factor (G-CSF). Here we describe the identification of a novel point mutation in the extracellular domain of the G-CSF receptor (G-CSF-R) in an SCN patient who failed to respond to G-CSF treatment. When this mutant G-CSF-R was expressed in myeloid cells, it was defective in both proliferation and survival signaling. This correlated with diminished activation of the receptor complex as determined by signal transducer and activator of transcription (STAT) activation, although activation of STAT5 was more affected than STAT3. Interestingly, the mutant receptor showed normal affinity for ligand, but a reduced number of ligand binding sites compared with the wild-type receptor. This suggests that the mutation in the extracellular domain affects ligand-receptor complex formation with severe consequences for intracellular signal transduction. Together these data add to our understanding of the mechanisms of cytokine receptor signaling, emphasize the role of GCSFR mutations in the etiology of SCN, and implicate such mutations in G-CSF hyporesponsiveness.
JournalThe Journal of Experimental Medicine
Pagination497 - 507
PublisherRockefeller University Press
LocationNew York, N.Y.
Link to full text
Publication classificationC1.1 Refereed article in a scholarly journal
Copyright notice1999, Rockefeller University Press
CategoriesNo categories selected
Bone Marrow CellsCell DivisionDose-Response Relationship, DrugFemaleGranulocyte Colony-Stimulating FactorHumansInfantLigandsModels, MolecularNeutropeniaPoint MutationProtein BindingReverse Transcriptase Polymerase Chain ReactionSequence Analysis, DNAsignal transductioncytokinereceptorcell survivalstructure activity relationshipScience & TechnologyLife Sciences & BiomedicineImmunologyMedicine, Research & ExperimentalResearch & Experimental MedicineDISTINCT CYTOPLASMIC REGIONSHUMAN GROWTH-HORMONELIGAND-BINDINGINDUCED-DIFFERENTIATIONEXPRESSION CLONINGCRYSTAL-STRUCTURERAPID ACTIVATIONINTERFERON-GAMMACELLSSTAT3