miR-17∼92, miR-106b∼25, and miR-106a∼363 belong to a family of highly conserved miRNA clusters. Amplification and overexpression of miR-17∼92 is observed in human cancers, and its oncogenic properties have been confirmed in a mouse model of B cell lymphoma. Here we show that mice deficient for miR-17∼92 die shortly after birth with lung hypoplasia and a ventricular septal defect. The miR-17∼92 cluster is also essential for B cell development. Absence of miR-17∼92 leads to increased levels of the proapoptotic protein Bim and inhibits B cell development at the pro-B to pre-B transition. Furthermore, while ablation of miR-106b∼25 or miR-106a∼363 has no obvious phenotypic consequences, compound mutant embryos lacking both miR-106b∼25 and miR-17∼92 die at midgestation. These results provide key insights into the physiologic functions of this family of microRNAs and suggest a link between the oncogenic properties of miR-17∼92 and its functions during B lymphopoiesis and lung development.

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Persistent URL dx.doi.org/10.1016/j.cell.2008.02.019, hdl.handle.net/1765/29039
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Ventura, A, Young, A.G, Winslow, M.M, Lintault, L, Meissner, A, Erkeland, S.J, … Jacks, T. (2008). Targeted Deletion Reveals Essential and Overlapping Functions of the miR-17∼92 Family of miRNA Clusters. Cell, 132(5), 875–886. doi:10.1016/j.cell.2008.02.019