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Blood. 2011 Oct 27;118(17):4666-73. doi: 10.1182/blood-2010-12-324715. Epub 2011 Aug 26.

Coordinate loss of a microRNA and protein-coding gene cooperate in the pathogenesis of 5q- syndrome.

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  • 1Department of Biology, Howard Hughes Medical Institute, USA.

Abstract

Large chromosomal deletions are among the most common molecular abnormalities in cancer, yet the identification of relevant genes has proven difficult. The 5q- syndrome, a subtype of myelodysplastic syndrome (MDS), is a chromosomal deletion syndrome characterized by anemia and thrombocytosis. Although we have previously shown that hemizygous loss of RPS14 recapitulates the failed erythroid differentiation seen in 5q- syndrome, it does not affect thrombocytosis. Here we show that a microRNA located in the common deletion region of 5q- syndrome, miR-145, affects megakaryocyte and erythroid differentiation. We find that miR-145 functions through repression of Fli-1, a megakaryocyte and erythroid regulatory transcription factor. Patients with del(5q) MDS have decreased expression of miR-145 and increased expression of Fli-1. Overexpression of miR-145 or inhibition of Fli-1 decreases the production of megakaryocytic cells relative to erythroid cells, whereas inhibition of miR-145 or overexpression of Fli-1 has a reciprocal effect. Moreover, combined loss of miR-145 and RPS14 cooperates to alter erythroid-megakaryocytic differentiation in a manner similar to the 5q- syndrome. Taken together, these findings demonstrate that coordinate deletion of a miRNA and a protein-coding gene contributes to the phenotype of a human malignancy, the 5q- syndrome.

PMID:
21873545
[PubMed - indexed for MEDLINE]
PMCID:
PMC3208282
Free PMC Article

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