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Context-specific regulation of cell survival by a miRNA-controlled BIM rheostat.


ABSTRACT: Knockout of the ubiquitously expressed miRNA-17?92 cluster in mice produces a lethal developmental lung defect, skeletal abnormalities, and blocked B lymphopoiesis. A shared target of miR-17?92 miRNAs is the pro-apoptotic protein BIM, central to life-death decisions in mammalian cells. To clarify the contribution of miR-17?92:Bim interactions to the complex miR-17?92 knockout phenotype, we used a system of conditional mutagenesis of the nine Bim 3' UTR miR-17?92 seed matches. Blocking miR-17?92:Bim interactions early in development phenocopied the lethal lung phenotype of miR-17?92 ablation and generated a skeletal kinky tail. In the hematopoietic system, instead of causing the predicted B cell developmental block, it produced a selective inability of B cells to resist cellular stress; and prevented B and T cell hyperplasia caused by Bim haploinsufficiency. Thus, the interaction of miR-17?92 with a single target is essential for life, and BIM regulation by miRNAs serves as a rheostat controlling cell survival in specific physiological contexts.

SUBMITTER: Labi V 

PROVIDER: S-EPMC6942046 | biostudies-literature | 2019 Dec

REPOSITORIES: biostudies-literature

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Knockout of the ubiquitously expressed miRNA-17∼92 cluster in mice produces a lethal developmental lung defect, skeletal abnormalities, and blocked B lymphopoiesis. A shared target of miR-17∼92 miRNAs is the pro-apoptotic protein BIM, central to life-death decisions in mammalian cells. To clarify the contribution of miR-17∼92:Bim interactions to the complex miR-17∼92 knockout phenotype, we used a system of conditional mutagenesis of the nine <i>Bim</i> 3' UTR miR-17∼92 seed matches. Blocking miR  ...[more]

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