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2015 ; 43
(19
): 9350-61
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A cytoplasmic pathway for gapmer antisense oligonucleotide-mediated gene
silencing in mammalian cells
#MMPMID26433227
Castanotto D
; Lin M
; Kowolik C
; Wang L
; Ren XQ
; Soifer HS
; Koch T
; Hansen BR
; Oerum H
; Armstrong B
; Wang Z
; Bauer P
; Rossi J
; Stein CA
Nucleic Acids Res
2015[Oct]; 43
(19
): 9350-61
PMID26433227
show ga
Antisense oligonucleotides (ASOs) are known to trigger mRNA degradation in the
nucleus via an RNase H-dependent mechanism. We have now identified a putative
cytoplasmic mechanism through which ASO gapmers silence their targets when
transfected or delivered gymnotically (i.e. in the absence of any transfection
reagent). We have shown that the ASO gapmers can interact with the Ago-2 PAZ
domain and can localize into GW-182 mRNA-degradation bodies (GW-bodies). The
degradation products of the targeted mRNA, however, are not generated by
Ago-2-directed cleavage. The apparent identification of a cytoplasmic pathway
complements the previously known nuclear activity of ASOs and concurrently
suggests that nuclear localization is not an absolute requirement for gene
silencing.