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Originally published in Science Express on 15 June 2006
Science 21 July 2006:
Vol. 313. no. 5785, pp. 363 - 367
DOI: 10.1126/science.1130164
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Reports

Characterization of the piRNA Complex from Rat Testes

Nelson C. Lau,1* Anita G. Seto,1* Jinkuk Kim,2,3 Satomi Kuramochi-Miyagawa,4 Toru Nakano,4 David P. Bartel,3,5 Robert E. Kingston1{dagger}

Small noncoding RNAs regulate processes essential for cell growth and development, including mRNA degradation, translational repression, and transcriptional gene silencing (TGS). During a search for candidate mammalian factors for TGS, we purified a complex that contains small RNAs and Riwi, the rat homolog to human Piwi. The RNAs, frequently 29 to 30 nucleotides in length, are called Piwi-interacting RNAs (piRNAs), 94% of which map to 100 defined (≤101 kb) genomic regions. Within these regions, the piRNAs generally distribute across only one genomic strand or distribute on two strands but in a divergent, nonoverlapping manner. Preparations of piRNA complex (piRC) contain rRecQ1, which is homologous to qde-3 from Neurospora, a gene implicated in silencing pathways. Piwi has been genetically linked to TGS in flies, and slicer activity cofractionates with the purified complex. These results are consistent with a gene-silencing role for piRC in mammals.

1 Department of Molecular Biology, Massachusetts General Hospital, 185 Cambridge Street, Boston, MA 02114, USA.
2 Harvard-MIT Division of Health Sciences and Technology, E18-435, 77 Massachusetts Avenue, Cambridge, MA 02139, USA.
3 Howard Hughes Medical Institute and Whitehead Institute for Biomedical Research, 9 Cambridge Center, Cambridge, MA 02142, USA.
4 Department of Molecular Cell Biology, Research Institute for Microbial Diseases, Osaka University, 3-1 Yamada-oka, Suita-shi, Osaka 565-0871, Japan.
5 Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

* These authors contributed equally to this work.

{dagger} To whom correspondence should be addressed. E-mail: kingston{at}molbio.mgh.harvard.edu

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