Variable expression levels detected in the Drosophila effectors of piRNA biogenesis.

Abstract excerpt

piRNAs (piwi-interacting RNAs) are a class of small interfering RNAs that play a major role in the regulation of transposable elements (TEs) in Drosophila and are considered of fundamental importance in gonadal development. Genes encoding the effectors of the piRNA machinery are thus often thought to be highly constrained. On the contrary, as actors of genetic immunity, these genes have also been shown to evolve...

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