Summary This study identifies Topoisomerase 3β as a factor that facilitates piRNA biogenesis, with loss of TOP3B leading to reduced piRNA production, derepression of transposable elements, and impaired germ cell development. The findings reveal a novel role for a DNA/RNA topoisomerase in small RNA biology.
Summary This study dissects the molecular interactions between Aubergine and Tudor-domain proteins and their roles in piRNA amplification through the ping-pong cycle and in the formation of the germ plasm. The findings provide mechanistic insight into how piRNA pathway components are organized in germ granules.
Summary This study characterizes the small RNA content of the Drosophila Kc167 cell line and demonstrates that it contains an active primary piRNA pathway. The findings establish Kc167 cells as a useful model system for studying piRNA biogenesis and function in vitro.
Summary This study shows that piRNAs promote germ plasm localization of mRNAs through a sequence-dependent but not sequence-specific adhesion mechanism. The findings reveal that the overall sequence composition, rather than specific complementarity, determines which mRNAs are retained in the germ plasm.
Summary This study demonstrates that MOV10L1, a germline-specific RNA helicase, directly binds to piRNA precursors and is required for their processing into mature piRNAs. MOV10L1 acts upstream of Piwi proteins in the piRNA biogenesis pathway, providing mechanistic insight into piRNA production.
Summary This study identifies BmPAPI, a mitochondrial protein in the silkworm Bombyx mori, as a factor that modulates the length of mature piRNAs. The findings provide mechanistic insight into the piRNA 3’ end processing pathway and link mitochondria to piRNA biogenesis.
Summary Using CLIP-seq, this study maps the RNA targets of mouse PIWI proteins Mili and Miwi, providing insights into the mechanisms of piRNA biogenesis and the specific role of Miwi in regulating spermiogenesis through piRNA-mediated gene silencing.