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Genome-wide RNA-mediated interference screen identifies miR-19 targets in Notch-induced T-cell acute lymphoblastic leukaemia.

Abstract：

:MicroRNAs (miRNAs) have emerged as novel cancer genes. In particular, the miR-17-92 cluster, containing six individual miRNAs, is highly expressed in haematopoietic cancers and promotes lymphomagenesis in vivo. Clinical use of these findings hinges on isolating the oncogenic activity within the 17-92 cluster and defining its relevant target genes. Here we show that miR-19 is sufficient to promote leukaemogenesis in Notch1-induced T-cell acute lymphoblastic leukaemia (T-ALL) in vivo. In concord with the pathogenic importance of this interaction in T-ALL, we report a novel translocation that targets the 17-92 cluster and coincides with a second rearrangement that activates Notch1. To identify the miR-19 targets responsible for its oncogenic action, we conducted a large-scale short hairpin RNA screen for genes whose knockdown can phenocopy miR-19. Strikingly, the results of this screen were enriched for miR-19 target genes, and include Bim (Bcl2L11), AMP-activated kinase (Prkaa1) and the phosphatases Pten and PP2A (Ppp2r5e). Hence, an unbiased, functional genomics approach reveals a coordinate clampdown on several regulators of phosphatidylinositol-3-OH kinase-related survival signals by the leukaemogenic miR-19.

journal_name

Nat Cell Biol

journal_title

Nature cell biology

authors

Mavrakis KJ,Wolfe AL,Oricchio E,Palomero T,de Keersmaecker K,McJunkin K,Zuber J,James T,Khan AA,Leslie CS,Parker JS,Paddison PJ,Tam W,Ferrando A,Wendel HG

doi

10.1038/ncb2037

subject

Has Abstract

pub_date

2010-04-01 00:00:00

pages

372-9

issue

4

eissn

1465-7392

issn

1476-4679

pii

ncb2037

journal_volume

12

pub_type

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