Rescuing dicer defects via inhibition of an anti-dicing nuclease.
Rescuing dicer defects via inhibition of an anti-dicing nuclease.
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DOI:
10.1016/j.celrep.2014.10.021
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发表时间:
2014-11-20
期刊:
影响因子:
8.8
通讯作者:
Paroo Z
中科院分区:
文献类型:
--
作者:
Asada K;Canestrari E;Fu X;Li Z;Makowski E;Wu YC;Mito JK;Kirsch DG;Baraban J;Paroo Z
Genetic defects in the microRNA (miRNA) generating enzyme, dicer, are increasingly linked to disease. Loss of miRNA in dicer deficiency is thought to be due to loss of miRNA-generating activity. Here, we demonstrate a previously unknown catabolic mechanism driving miRNA depletion in dicer deficiency. We developed a Dicer-antagonist assay revealing a pre-miRNA degrading enzyme that competes with pre-miRNA processing. We purified this pre-miRNA degrading activity using an unbiased chromatographic procedure and identified the ribonuclease complex Translin/Trax (TN/TX). In wild type dicer backgrounds, pre-miRNA processing was dominant. However, in dicer deficient contexts, TN/TX broadly suppressed miRNA. These findings indicate that miRNA depletion in dicer deficiency is due to the combined loss of miRNA-generating activity and catabolic function of TN/TX. Importantly, inhibition of TN/TX mitigated loss of both miRNA and tumor suppression with dicer haploinsufficiency. These studies reveal a potentially druggable target for restoring miRNA function in cancers and emerging dicer deficiencies.
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影响因子:
64.8
作者:
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通讯作者:
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DOI:
10.1073/pnas.0811523106
发表时间:
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通讯作者:
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