Small regulatory RNAs function both in the cytoplasm, inhibiting expression from messenger RNAs, and in the nucleus, silencing heterochromatin and preventing genome rearrangement. Now a new protein involved in RNA interference in the nucleus has been characterized. This protein, NRDE-2, associates with NRDE-3 and short interfering RNAs on nascent transcripts. This association prevents elongation of the transcripts by RNA polymerase II, making this a co-transcriptional form of gene silencing.
- Shouhong Guang
- Aaron F. Bochner
- Scott Kennedy