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2016 ; 7
(50
): 83627-83640
Nephropedia Template TP
gab.com Text
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English Wikipedia
Transcription factor LSF-DNMT1 complex dissociation by FQI1 leads to aberrant DNA
methylation and gene expression
#MMPMID27845898
Chin HG
; Ponnaluri VK
; Zhang G
; Estève PO
; Schaus SE
; Hansen U
; Pradhan S
Oncotarget
2016[Dec]; 7
(50
): 83627-83640
PMID27845898
show ga
The transcription factor LSF is highly expressed in hepatocellular carcinoma
(HCC) and promotes oncogenesis. Factor quinolinone inhibitor 1 (FQI1), inhibits
LSF DNA-binding activity and exerts anti-proliferative activity. Here, we show
that LSF binds directly to the maintenance DNA (cytosine-5) methyltransferase 1
(DNMT1) and its accessory protein UHRF1 both in vivo and in vitro. Binding of LSF
to DNMT1 stimulated DNMT1 activity and FQI1 negated the methyltransferase
activation. Addition of FQI1 to the cell culture disrupted LSF bound DNMT1 and
UHRF1 complexes, resulting in global aberrant CpG methylation. Differentially
methylated regions (DMR) containing at least 3 CpGs, were significantly altered
by FQI1 compared to control cells. The DMRs were mostly concentrated in CpG
islands, proximal to transcription start sites, and in introns and known genes.
These DMRs represented both hypo and hypermethylation, correlating with altered
gene expression. FQI1 treatment elicits a cascade of effects promoting altered
cell cycle progression. These findings demonstrate a novel mechanism of FQI1
mediated alteration of the epigenome by DNMT1-LSF complex disruption, leading to
aberrant DNA methylation and gene expression.