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MYBL2 is a sub-haploinsufficient tumor suppressor gene in myeloid malignancy

Stefan Heinrichs1, Lillian F Conover, Carlos E Bueso-Ramos

  • 1Institute of Transfusion Medicine , University Hospital Essen , Essen , Germany ; Department of Pediatric Oncology , Dana-Farber Cancer Institute , Boston , United States.

Elife
|July 24, 2013
PubMed

Insights

Reduced MYBL2 gene activity, not just haploinsufficiency, drives clonal expansion in myeloid malignancies like myelodysplastic syndromes (MDS) and myeloproliferative neoplasms (MPN). This finding impacts understanding of these blood cancers.

Area of Science:

  • Hematology
  • Cancer Biology
  • Genetics

Background:

  • A common deleted region on chromosome 20 (20q CDR) is implicated in myelodysplastic syndromes (MDS) and myeloproliferative neoplasms (MPN).
  • This region is predicted to harbor a tumor suppressor gene crucial for hematopoiesis.

Purpose of the Study:

  • To investigate the role of the MYBL2 gene, located within the 20q CDR, in myeloid malignancies.
  • To determine if reduced MYBL2 expression contributes to the pathogenesis of MDS and MPN.

Main Methods:

  • Assessed MYBL2 expression levels in CD34+ cells from MDS patients.
  • Utilized a murine competitive reconstitution model with RNA interference (RNAi) to knockdown Mybl2 expression in hematopoietic progenitors.
  • Analyzed hematopoietic reconstitution and disease development in transplanted mice.

Main Results:

  • MYBL2 was expressed at significantly reduced levels in CD34+ cells from a majority of MDS patients (65%).
  • Mybl2 knockdown (20-30% of normal) in murine hematopoietic progenitors led to their clonal dominance.
  • Mice transplanted with Mybl2-downregulated cells developed clonal myeloproliferative/myelodysplastic disorders.

Conclusions:

  • Downregulation of MYBL2 activity below classical haploinsufficiency levels drives clonal expansion of hematopoietic progenitors.
  • Reduced MYBL2 function is a key mechanism underlying a significant fraction of human myeloid malignancies.
  • MYBL2 is a critical tumor suppressor in hematopoiesis, and its reduced activity contributes to MDS and MPN development.
Keywords:
20q CDRHumanMYBL2MouseMyelodysplastic Syndromes

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