siRNAs can function as miRNAs.
With the discovery of RNA interference (RNAi) and related phenomena, new regulatory roles attributed to RNA continue to emerge. Here we show, in mammalian tissue culture, that a short interfering RNA (siRNA) can repress expression of a target mRNA with partially complementary binding sites in its 3' UTR, much like the demonstrated function of endogenously encoded microRNAs (miRNAs). The mechanism for this repression is cooperative, distinct from the catalytic mechanism of mRNA cleavage by siRNAs. The use of siRNAs to study translational repression holds promise for dissecting the sequence and structural determinants and general mechanism of gene repression by miRNAs.
Doench
John G
JG
Center for Cancer Research, Department of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Petersen
Christian P
CP
Sharp
Phillip A
PA
D020413:3' Untranslated Regions; D020029:Base Pairing; D001665:Binding Sites; D004722:Endoribonucleases / Q000378:metabolism; D020868:Gene Silencing; D017930:Genes, Reporter; D006367:HeLa Cells; D006801:Humans; D008156:Luciferases / Q000235:genetics / Q000378:metabolism; D035683:MicroRNAs / Q000378:metabolism*; D014176:Protein Biosynthesis; D034622:RNA Interference; D012333:RNA, Messenger / Q000378:metabolism; D034741:RNA, Small Interfering / Q000378:metabolism*; D019718:Receptors, CXCR4 / Q000235:genetics / Q000378:metabolism; D043244:Ribonuclease III; D014162:Transfection
D020413:3' Untranslated Regions; D035683:MicroRNAs; D012333:RNA, Messenger; D034741:RNA, Small Interfering; D019718:Receptors, CXCR4; D008156:Luciferases; D004722:Endoribonucleases; D043244:Ribonuclease III