Using in vitro assays with hematopoietic progenitors from patients of both patient groups we could provide experimental evidence for a residual activity of the thrombopoietin receptor in CAMT II patients.
Using in vitro assays with hematopoietic progenitors from patients of both patient groups we could provide experimental evidence for a residual activity of the thrombopoietin receptor in CAMT II patients.
Compound heterozygous c-Mpl mutations in a child with congenital amegakaryocytic thrombocytopenia: functional characterization and a review of the literature.
In addition to the clinical importance of recognizing this disorder, characterization of mutations identified in patients with CAMT has led to insights into thrombopoietin receptor structure and function.
Surprisingly, complimentary transduction of MPL into normal or CAMT iPSCs using a retroviral vector showed that MPL overexpression promoted erythropoiesis in normal CD34+ hematopoietic progenitor cells (HPCs), but impaired erythropoiesis and increased aberrant megakaryocyte production in CAMT iPSC-derived CD34+ HPCs, reflecting a difference in the expression of the transcription factor FLI1.
Compound heterozygous c-Mpl mutations in a child with congenital amegakaryocytic thrombocytopenia: functional characterization and a review of the literature.
Recently, we and others could define the molecular cause of the rare disease congenital amegakaryocytic thrombocytopenia (CAMT) as mutations in the c-mpl gene (Blood 97: 139, 2001).
Using in vitro assays with hematopoietic progenitors from patients of both patient groups we could provide experimental evidence for a residual activity of the thrombopoietin receptor in CAMT II patients.
We describe a CAMT patient with compound heterozygous mutations of the causative MPL gene (one being a previously unreported splice site mutation in intron 11) who developed pancytopenia within the first month of life.
Using in vitro assays with hematopoietic progenitors from patients of both patient groups we could provide experimental evidence for a residual activity of the thrombopoietin receptor in CAMT II patients.
Because the c-mpl gene was considered as one of the candidate genes for this disorder, we analyzed the genomic sequence of the c-mpl gene of a 10-year-old Japanese girl with CAMT.
Most of the cases of congenital amegakaryocytic thrombocytopenia are caused by defective expression or function of the thrombopoietin receptor due to homozygous or compound heterozygous mutations in the gene MPL.