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2017 ; 41
(6
): 623-637.e9
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Distinct Roles of RNA Helicases MVH and TDRD9 in PIWI Slicing-Triggered Mammalian
piRNA Biogenesis and Function
#MMPMID28633017
Wenda JM
; Homolka D
; Yang Z
; Spinelli P
; Sachidanandam R
; Pandey RR
; Pillai RS
Dev Cell
2017[Jun]; 41
(6
): 623-637.e9
PMID28633017
show ga
Small RNAs called PIWI-interacting RNAs (piRNAs) act as an immune system to
suppress transposable elements in the animal gonads. A poorly understood adaptive
pathway links cytoplasmic slicing of target RNA by the PIWI protein MILI to
loading of target-derived piRNAs into nuclear MIWI2. Here we demonstrate that
MILI slicing generates a 16-nt by-product that is discarded and a pre-piRNA
intermediate that is used for phased piRNA production. The ATPase activity of
Mouse Vasa Homolog (MVH) is essential for processing the intermediate into
piRNAs, ensuring transposon silencing and male fertility. The ATPase activity
controls dissociation of an MVH complex containing PIWI proteins, piRNAs, and
slicer products, allowing safe handover of the intermediate. In contrast, ATPase
activity of TDRD9 is dispensable for piRNA biogenesis but is essential for
transposon silencing and male fertility. Our work implicates distinct RNA
helicases in specific steps along the nuclear piRNA pathway.