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Small Interfering RNA-Induced Transcriptional Gene Silencing in Human Cells
Kevin V. Morris,1*Simon W.-L. Chan,2Steven E. Jacobsen,2,3David J. Looney1,4
Small interfering RNA (siRNA) and microRNA silence genes atthe transcriptional, posttranscriptional, and/or translationallevel. Using human tissue culture cells, we show that promoter-directedsiRNA inhibits transcription of an integrated, proviral, elongationfactor 1alpha (EF1A) promotergreen fluorescent proteinreporter gene and of endogenous EF1A. Silencing was associatedwith DNA methylation of the targeted sequence, and it requiredeither active transport of siRNA into the nucleus or permeabilizationof the nuclear envelope by lentiviral transduction. These resultsdemonstrate that siRNA-directed transcriptional silencing isconserved in mammals, providing a means to inhibit mammaliangene function.
1 Department of Medicine 0678, Stein Clinical Research Building, Room 302, University of CaliforniaSan Diego, La Jolla, CA 920930678, USA. 2 Department of Molecular, Cell, and Developmental Biology, University of CaliforniaLos Angeles, Los Angeles, CA 900951606, USA. 3 Molecular Biology Institute, University of CaliforniaLos Angeles, Los Angeles, CA 900951606, USA. 4 VA San Diego Healthcare System, Infectious Diseases, San Diego, CA 92161, USA.
Note added in proof: After this work was submitted, Fukugawaet al. showed that Dicer-defective chicken cells have heterochromatindefects at centromeres, possibly implicating siRNA in centromericsilencing (31).
* Present address: Division of Molecular Biology, Beckman ResearchInstitute, 1450 East Duarte Road, Duarte, CA 910103011,USA.
To whom correspondence should be addressed. E-mail: kmorris{at}coh.org
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