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Diverse pathways generate microRNA-like RNAs and Dicer-independent small interfering RNAs in fungi.


ABSTRACT: A variety of small RNAs, including the Dicer-dependent miRNAs and the Dicer-independent Piwi-interacting RNAs, associate with Argonaute family proteins to regulate gene expression in diverse cellular processes. These two species of small RNA have not been found in fungi. Here, by analyzing small RNAs associated with the Neurospora Argonaute protein QDE-2, we show that diverse pathways generate miRNA-like small RNAs (milRNAs) and Dicer-independent small interfering RNAs (disiRNAs) in this filamentous fungus. Surprisingly, milRNAs are produced by at least four different mechanisms that use a distinct combination of factors, including Dicers, QDE-2, the exonuclease QIP, and an RNase III domain-containing protein, MRPL3. In contrast, disiRNAs originate from loci producing overlapping sense and antisense transcripts, and do not require the known RNAi components for their production. Taken together, these results uncover several pathways for small RNA production in filamentous fungi, shedding light on the diversity and evolutionary origins of eukaryotic small RNAs.

SUBMITTER: Lee HC 

PROVIDER: S-EPMC2902691 | biostudies-literature | 2010 Jun

REPOSITORIES: biostudies-literature

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Diverse pathways generate microRNA-like RNAs and Dicer-independent small interfering RNAs in fungi.

Lee Heng-Chi HC   Li Liande L   Gu Weifeng W   Xue Zhihong Z   Crosthwaite Susan K SK   Pertsemlidis Alexander A   Lewis Zachary A ZA   Freitag Michael M   Selker Eric U EU   Mello Craig C CC   Liu Yi Y  

Molecular cell 20100422 6


A variety of small RNAs, including the Dicer-dependent miRNAs and the Dicer-independent Piwi-interacting RNAs, associate with Argonaute family proteins to regulate gene expression in diverse cellular processes. These two species of small RNA have not been found in fungi. Here, by analyzing small RNAs associated with the Neurospora Argonaute protein QDE-2, we show that diverse pathways generate miRNA-like small RNAs (milRNAs) and Dicer-independent small interfering RNAs (disiRNAs) in this filamen  ...[more]

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