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2015 ; 11
(10
): e1005615
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Association of the Long Non-coding RNA Steroid Receptor RNA Activator (SRA) with
TrxG and PRC2 Complexes
#MMPMID26496121
Wongtrakoongate P
; Riddick G
; Fucharoen S
; Felsenfeld G
PLoS Genet
2015[Oct]; 11
(10
): e1005615
PMID26496121
show ga
Long non-coding RNAs (lncRNAs) have been recognized as key players in
transcriptional regulation. We show that the lncRNA steroid receptor RNA
activator (SRA) participates in regulation through complex formation with
trithorax group (TrxG) and polycomb repressive complex 2 (PRC2) complexes.
Binding of the SRA-associated RNA helicase p68 preferentially stabilizes complex
formation between SRA and a TrxG complex but not PRC2. In human pluripotent stem
cells NTERA2, SRA binding sites that are also occupied by p68 are significantly
enriched for H3K4 trimethylation. Consistent with its ability to interact with
TrxG and PRC2 complexes, some SRA binding sites in human pluripotent stem cells
overlap with bivalent domains. CTCF sites associated with SRA appear also to be
enriched for bivalent modifications. We identify NANOG as a transcription factor
directly interacting with SRA and co-localizing with it genome-wide in NTERA2.
Further, we show that SRA is important for maintaining the stem cell state and
for reprogramming of human fibroblasts to achieve the pluripotent state. Our
results suggest a mechanism whereby the lncRNA SRA interacts with either TrxG or
PRC2. These complexes may then be recruited by various DNA binding factors to
deliver either activating or silencing signals, or both, to establish bivalent
domains.