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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Nat+Commun
2017 ; 8
(1
): 36
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English Wikipedia
Flipping between Polycomb repressed and active transcriptional states introduces
noise in gene expression
#MMPMID28652613
Kar G
; Kim JK
; Kolodziejczyk AA
; Natarajan KN
; Torlai Triglia E
; Mifsud B
; Elderkin S
; Marioni JC
; Pombo A
; Teichmann SA
Nat Commun
2017[Jun]; 8
(1
): 36
PMID28652613
show ga
Polycomb repressive complexes (PRCs) are important histone modifiers, which
silence gene expression; yet, there exists a subset of PRC-bound genes actively
transcribed by RNA polymerase II (RNAPII). It is likely that the role of Polycomb
repressive complex is to dampen expression of these PRC-active genes. However, it
is unclear how this flipping between chromatin states alters the kinetics of
transcription. Here, we integrate histone modifications and RNAPII states derived
from bulk ChIP-seq data with single-cell RNA-sequencing data. We find that
Polycomb repressive complex-active genes have greater cell-to-cell variation in
expression than active genes, and these results are validated by knockout
experiments. We also show that PRC-active genes are clustered on chromosomes in
both two and three dimensions, and interactions with active enhancers promote a
stabilization of gene expression noise. These findings provide new insights into
how chromatin regulation modulates stochastic gene expression and transcriptional
bursting, with implications for regulation of pluripotency and
development.Polycomb repressive complexes modify histones but it is unclear how
changes in chromatin states alter kinetics of transcription. Here, the authors
use single-cell RNAseq and ChIPseq to find that actively transcribed genes with
Polycomb marks have greater cell-to-cell variation in expression.