A Novel Mutation in the Juxtamembrane Intracellular Sequence of the Granulocyte Colony-Stimulating Factor (G-CSF) Receptor Gene in a Patient with Severe Congenital Neutropenia Augments G-CSF Proliferation Activity but Not through the MAP Kinase Cascade

Abstract

We analyzed the structure of the granulocyte colony-stimulating factor (G-CSF) receptor gene in a 6-year-old female patient with severe congenital neutropenia (SCN) who experienced severe recurrent infections since 1 month of age. There is no family history of any similar disease. When the patient was 4 months old, she began receiving treatment with recombinant human G-CSF that resulted in a small increase in the neutrophil count sufficient for the prevention and treatment of bacterial infection. An analysis of complementary DNA for the patient’s G-CSF receptor revealed a 3-base pair deletion in the juxtamembrane intracellular sequence. This deletion at the beginning of exon 16 was thought to be caused by alternative splicing; analysis of the DNA revealed a G-to-A point mutation of the final nucleotide of intron 15. To evaluate the functional activity of the G-CSF receptor with this 3-base pair deletion of the juxtamembrane region, we transfected this G-CSF receptor mutant into an interleukin 3-dependent cell line, BAF/3. BAF/3 cells expressing the mutant G-CSF receptor showed augmented proliferation activity in response to G-CSF compared with cells having the wild-type G-CSF receptor. Although the proliferation signal of G-CSF in normal hematopoiesis is transduced through the activation of MAP kinases, this G-CSF receptor mutant showed decreased activation of ERK1/2 in response to G-CSF compared with the wild type, but the transduced signal for Stat3 activation by G-CSF was of the same magnitude as that of the wild-type G-CSF receptor. This result means that the augmented proliferation activity in response to G-CSF that we observed in cells having the G-CSF receptor gene with the 3-base pair deletion is transduced through an intracellular signaling pathway other than MAP kinase. Because SCN patients with a mutation in the G-CSF receptor frequently develop leukemia, this 3-base pair deletion in the juxtamembrane sequence of the G-CSF receptor gene in this patient may be one step in the course of leukemic transformation.

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Correspondence to Toshihiro Yokoyama or Seiichi Okamura or Yoshinobu Asano or Kenjirou Kamezaki or Akihiko Numata or Haruko Kakumitsu or Koutarou Shide or Hitoshi Nakashima or Taisuke Kanaji or Yuichi Sekine or Yumi Mizuno or Jun Okamura or Tadashi Matsuda or Mine Harada or Yoshiyuki Niho or Kazuya Shimoda.

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Yokoyama, T., Okamura, S., Asano, Y. et al. A Novel Mutation in the Juxtamembrane Intracellular Sequence of the Granulocyte Colony-Stimulating Factor (G-CSF) Receptor Gene in a Patient with Severe Congenital Neutropenia Augments G-CSF Proliferation Activity but Not through the MAP Kinase Cascade. Int J Hematol 82, 28–34 (2005). https://doi.org/10.1532/IJH97.05010

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Key words

  • Congenital neutropenia
  • G-CSF receptor
  • MAP kinase