4.7 Article

Pimet, the Drosophila homolog of HEN1, mediates 2′-O-methylation of PIWI-interacting RNAs at their 3′ ends

Journal

GENES & DEVELOPMENT
Volume 21, Issue 13, Pages 1603-1608

Publisher

COLD SPRING HARBOR LAB PRESS, PUBLICATIONS DEPT
DOI: 10.1101/gad.1563607

Keywords

piRNA; 2 ' O-methylation; HEN1; pimet; Drosophila

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Piwi-interacting RNAs (piRNAs) consist of a germline-specific group of small RNAs derived from distinct intergenic loci in the genome. piRNAs function in silencing selfish transposable elements through binding with the PIWI subfamily proteins of Argonautes. Here we show that piRNAs in Drosophila are 2 '-O-methylated at their 3 ' ends. Loss of Pimet (piRNA methyltransferase), the Drosophila homolog of Arabidopsis HEN1 methyltransferase for microRNAs ( miRNAs), results in loss of 2 '-O-methylation of fly piRNAs. Recombinant Pimet shows single-stranded small RNA methylation activity in vitro and interacts with the PIWI proteins within Pimet mutant ovary. These results show that Pimet mediates piRNA 2 '-O-methylation in Drosophila.

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