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2017 ; 506
(ä): 34-44
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gab.com Text
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The Human Immunodeficiency Virus 1 ASP RNA promotes viral latency by recruiting
the Polycomb Repressor Complex 2 and promoting nucleosome assembly
#MMPMID28340355
Zapata JC
; Campilongo F
; Barclay RA
; DeMarino C
; Iglesias-Ussel MD
; Kashanchi F
; Romerio F
Virology
2017[Jun]; 506
(ä): 34-44
PMID28340355
show ga
Various epigenetic marks at the HIV-1 5'LTR suppress proviral expression and
promote latency. Cellular antisense transcripts known as long noncoding RNAs
(lncRNAs) recruit the polycomb repressor complex 2 (PRC2) to gene promoters,
which catalyzes trimethylation of lysine 27 on histone H3 (H3K27me3), thus
promoting nucleosome assembly and suppressing gene expression. We found that an
HIV-1 antisense transcript expressed from the 3'LTR and encoding the antisense
protein ASP promotes proviral latency. Expression of ASP RNA reduced HIV-1
replication in Jurkat cells. Moreover, ASP RNA expression promoted the
establishment and maintenance of HIV-1 latency in Jurkat E4 cells. We show that
this transcript interacts with and recruits PRC2 to the HIV-1 5'LTR, increasing
accumulation of the suppressive epigenetic mark H3K27me3, while reducing RNA
Polymerase II and thus proviral transcription. Altogether, our results suggest
that the HIV-1 ASP transcript promotes epigenetic silencing of the HIV-1 5'LTR
and proviral latency through the PRC2 pathway.