Mutations of an E3 ubiquitin ligase c-Cbl but not TET2 mutations are pathogenic in juvenile myelomonocytic leukemia

Hideki Muramatsu, Hideki Makishima, Anna M. Jankowska, Heather Cazzolli, Christine O'Keefe, Nao Yoshida, Yinyan Xu, Nobuhiro Nishio, Asahito Hama, Hiroshi Yagasaki, Yoshiyuki Takahashi, Koji Kato, Atsushi Manabe, Seiji Kojima, Jaroslaw P. Maciejewski

Research output: Contribution to journalArticlepeer-review

78 Citations (Scopus)

Abstract

Juvenile myelomonocytic leukemia (JMML) is a rare pediatric myeloid neoplasm characterized by excessive proliferation of myelomonocytic cells. When we investigated the presence of recurrent molecular lesions in a cohort of 49 children with JMML, neurofibromatosis phenotype (and thereby NF1 mutation) was present in 2 patients (4%), whereas previously described PTPN11, NRAS, and KRAS mutations were found in 53%, 4%, and 2% of cases, respectively. Consequently, a significant proportion of JMML patients without identifiable pathogenesis prompted our search for other molecular defects. When we applied single nucleotide polymorphism arrays to JMML patients, somatic uniparental disomy 11q was detected in 4 of 49 patients; all of these cases harbored RING finger domain c-Cbl mutations. In total, c-Cbl mutations were detected in 5 (10%) of 49 patients. No mutations were identified in Cbl-b and TET2. c-Cbl and RAS pathway mutations were mutually exclusive. Comparison of clinical phenotypesshowedearlier presentation and lower hemoglobin F levels in patients with c-Cbl mutations. Our results indicate that mutations in c-Cbl may represent key molecular lesions in JMML patients without RAS/PTPN11 lesions, suggesting analogous pathogenesis to those observed in chronic myelomonocytic leukemia (CMML) patients.

Original languageEnglish
Pages (from-to)1969-1975
Number of pages7
JournalBlood
Volume115
Issue number10
DOIs
Publication statusPublished - Mar 11 2010
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Immunology
  • Hematology
  • Cell Biology

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