4.8 Article

Functional screen of MSI2 interactors identifies an essential role for SYNCRIP in myeloid leukemia stem cells

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NATURE GENETICS
卷 49, 期 6, 页码 866-+

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NATURE PUBLISHING GROUP
DOI: 10.1038/ng.3854

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资金

  1. MSKCC
  2. US National Institutes of Health National Institute of Diabetes, Digestive and Kidney Diseases Career Development Award
  3. NIDDK NIH [R01-DK101989-01A1]
  4. NCI [1R01CA193842-01]
  5. Louis V. Gerstner Young Investigator Award
  6. American Society of Hematology Junior Scholar Award
  7. Kimmel Scholar Award
  8. V-Scholar Award
  9. Geoffrey Beene Award
  10. Alex's Lemonade Stand A Award
  11. Starr Foundation
  12. Damon Runyon-Sohn Pediatric Cancer Fellowship Award
  13. National Cancer Institute (NIH)
  14. W.W. Smith Charitable Trust
  15. NIH/ NCI Cancer Support Core Grant [P30 CA08748]
  16. [U24 CA114737]
  17. [U10 CA180827]

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The identity of the RNA-binding proteins (RBPs) that govern cancer stem cells remains poorly characterized. The MSI2 RBP is a central regulator of translation of cancer stem cell programs. Through proteomic analysis of the MSI2-interacting RBP network and functional shRNA screening, we identified 24 genes required for in vivo leukemia. Syncrip was the most differentially required gene between normal and myeloid leukemia cells. SYNCRIP depletion increased apoptosis and differentiation while delaying leukemogenesis. Gene expression profiling of SYNCRIP-depleted cells demonstrated a loss of the MLL and HOXA9 leukemia stem cell program. SYNCRIP and MSI2 interact indirectly though shared mRNA targets. SYNCRIP maintains HOXA9 translation, and MSI2 or HOXA9 overexpression rescued the effects of SYNCRIP depletion. Altogether, our data identify SYNCRIP as a new RBP that controls the myeloid leukemia stem cell program. We propose that targeting these RBP complexes might provide a novel therapeutic strategy in leukemia.

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