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Molecular and Cellular Biology, November 2001, p. 7807-7816, Vol. 21, No. 22
Department of Dermatology and Cutaneous
Biology and Department of Biochemistry and Molecular Pharmacology,
Jefferson Institute of Molecular Medicine, Thomas Jefferson University,
and Jefferson Medical College,1 and
F. M. Kirby Center for Molecular Ophthalmology, Scheie Eye
Institute, University of Pennsylvania School of
Medicine,2 Philadelphia, Pennsylvania
Received 18 April 2001/Returned for modification 4 June
2001/Accepted 16 August 2001
Specific mRNA degradation mediated by double-stranded RNA (dsRNA)
interference (RNAi) is a powerful way of suppressing gene expression in
plants, nematodes, and fungal, insect, and protozoan systems. However,
only a few cases of RNAi have been reported in mammalian systems. Here,
we investigated the feasibility of the RNAi strategy in several
mammalian cells by using the enhanced green fluorescent protein gene as
a target, either by in situ production of dsRNA from transient
transfection of a plasmid harboring a 547-bp inverted repeat or by
direct transfection of dsRNA made by in vitro transcription. Several
mammalian cells including differentiated embryonic stem (ES) cells did
not exhibit specific RNAi in transient transfection. This long dsRNA,
however, was capable of inducing a sequence-specific RNAi for the
episomal and chromosomal target gene in undifferentiated ES cells.
dsRNA at 8.3 nM decreased the cognate gene expression up to 70%.
However, RNAi activity was not permanent because it was more pronounced
in early time points and diminished 5 days after transfection. Thus,
undifferentiated ES cells may lack the interferon response, similar to
mouse embryos and oocytes. Regardless of their apparent RNAi activity,
however, cytoplasmic extracts from mammalian cells produced a small RNA of 21 to 22 nucleotides from the long dsRNA. Our results suggest that
mammalian cells may possess RNAi activity but nonspecific activation of
the interferon response by longer dsRNA may mask the specific RNAi. The
findings offer an opportunity to use dsRNA for inhibition of gene
expression in ES cells to study differentiation.
0270-7306/01/$04.00+0 DOI: 10.1128/MCB.21.22.7807-7816.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
Specific Double-Stranded RNA Interference in
Undifferentiated Mouse Embryonic Stem Cells
*
Corresponding author. Mailing address: Department of
Dermatology and Cutaneous Biology, Department of Biochemistry and
Molecular Pharmacology, Jefferson Institute of Molecular Medicine,
Thomas Jefferson University, and Jefferson Medical College, 233 South 10th Street, Philadelphia, PA 19107. Phone: (215) 503-5434. Fax: (215)
503-5788. E-mail: kyonggeun.yoon{at}mail.tju.edu.
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