Selective pressure as an essential force in molecular evolution of myeloid leukemic clones: A view from the window of Fanconi anemia

M. W. Lensch, R. K. Rathbun, S. B. Olson, G. R. Jones, G. C. Bagby

Research output: Contribution to journalReview article

52 Scopus citations

Abstract

Specific chromosomal deletions are commonly found in bone marrow cells of children with Fanconi anemia (FA) whose disease has evolved to myelodysplastic syndrome (MDS) or acute myeloid leukemia (AML). Identical deletions are found in adults with MDS/AML with a history of exposure to alkylating agents (secondary MDS/AML). While deleted chromosomal regions likely harbor genes encoding proteins with tumor suppressor (TS) function, such genes have not been identified and the environmental forces by which these mutant clones are selected remain unclear. A consistent signaling abnormality in cells bearing mutations of the Fanconi anemia complementation group C (FA-C) gene (FANCC) has revealed a potential selective force. Hematopoietic progenitor cells from patients and mice with FANCC mutations are hypersensitive to the inhibitory effects of IFNγ and TNFα. Consequently, clonal outgrowths in FA likely result from strong selective pressure for stem and/or progenitor cells resistant to these inhibitory cytokines. Additional mutations that inactivate signaling pathways for these inhibitors would create a cell with a profound proliferative advantage over its apoptosis-prone counterparts. Here, we present preliminary evidence supporting a selection-based model of leukemic evolution and argue that MDS in FA patients is a de facto model of secondary MDS in non-FA adults.

Original languageEnglish (US)
Pages (from-to)1784-1789
Number of pages6
JournalLeukemia
Volume13
Issue number11
DOIs
StatePublished - Jan 1 1999

Keywords

  • Acute myeloid leukemia
  • Clonal evolution
  • Cytogenetics
  • Fanconi anemia
  • Molecular evolution
  • Myelodysplasia

ASJC Scopus subject areas

  • Hematology
  • Oncology
  • Cancer Research

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