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Blood, 15 April 2002, Vol. 99, No. 8, pp. 3066-3069
BRIEF REPORT
A novel mutation in the erythropoietin receptor gene is
associated with familial erythrocytosis
Murat O. Arcasoy,
Aysen F. Karayal,
Harvey M. Segal,
Joseph G. Sinning, and
Bernard G. Forget
From the Department of Medicine, Duke University
Medical Center, Durham, NC; Cancer Care of Maine, Bangor; and
Department of Internal Medicine, Yale University School of Medicine,
New Haven, CT.
Primary familial erythrocytosis (familial polycythemia) is a rare
myeloproliferative disorder with an autosomal dominant mode of
inheritance. We studied a new kindred with autosomal dominantly inherited familial erythrocytosis. The molecular basis for the observed
phenotype of isolated erythrocytosis is heterozygosity for a novel
nonsense mutation affecting codon 399 in exon 8 of the erythropoietin
receptor (EPOR) gene, encoding an EpoR peptide that
is truncated by 110 amino acids at its C-terminus. The new EPOR gene mutation 5881G>T was found to segregate
with isolated erythrocytosis in the affected family and this mutation
represents the most extensive EpoR truncation reported to date,
associated with familial erythrocytosis. Erythroid progenitors from an
affected individual displayed Epo hypersensitivity in in vitro
methylcellulose cultures, as indicated by more numerous
erythroid burst-forming unit-derived colonies in low Epo
concentrations compared to normal controls. Expression of mutant EpoR
in interleukin 3-dependent hematopoietic cells was associated
with Epo hyperresponsiveness compared to cells expressing
wild-type EpoR.

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