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2017 ; 18
(13
): 3117-3128
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SMARCAD1 Contributes to the Regulation of Naive Pluripotency by Interacting with
Histone Citrullination
#MMPMID28355564
Xiao S
; Lu J
; Sridhar B
; Cao X
; Yu P
; Zhao T
; Chen CC
; McDee D
; Sloofman L
; Wang Y
; Rivas-Astroza M
; Telugu BPVL
; Levasseur D
; Zhang K
; Liang H
; Zhao JC
; Tanaka TS
; Stormo G
; Zhong S
Cell Rep
2017[Mar]; 18
(13
): 3117-3128
PMID28355564
show ga
Histone citrullination regulates diverse cellular processes. Here, we report that
SMARCAD1 preferentially associates with H3 arginine 26 citrullination (H3R26Cit)
peptides present on arrays composed of 384 histone peptides harboring distinct
post-transcriptional modifications. Among ten histone modifications assayed by
ChIP-seq, H3R26Cit exhibited the most extensive genomewide co-localization with
SMARCAD1 binding. Increased Smarcad1 expression correlated with naive
pluripotency in pre-implantation embryos. In the presence of LIF, Smarcad1
knockdown (KD) embryonic stem cells lost naive state phenotypes but remained
pluripotent, as suggested by morphology, gene expression, histone modifications,
alkaline phosphatase activity, energy metabolism, embryoid bodies, teratoma, and
chimeras. The majority of H3R26Cit ChIP-seq peaks occupied by SMARCAD1 were
associated with increased levels of H3K9me3 in Smarcad1 KD cells. Inhibition of
H3Cit induced H3K9me3 at the overlapping regions of H3R26Cit peaks and SMARCAD1
peaks. These data suggest a model in which SMARCAD1 regulates naive pluripotency
by interacting with H3R26Cit and suppressing heterochromatin formation.