PIWI-interacting RNAs (piRNAs) have important roles in various species, particularly in silencing transposons in the germ line. This Review describes our latest understanding of various steps in this process, from the specification of piRNA-producing loci to piRNA processing and nuclear effector functions, including a role in transgenerational epigenetic inheritance.
- Maartje J. Luteijn
- René F. Ketting