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2017 ; 10
(ä): 8
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SMYD5 regulates H4K20me3-marked heterochromatin to safeguard ES cell self-renewal
and prevent spurious differentiation
#MMPMID28250819
Kidder BL
; Hu G
; Cui K
; Zhao K
Epigenetics Chromatin
2017[]; 10
(ä): 8
PMID28250819
show ga
BACKGROUND: Epigenetic regulation of chromatin states is thought to control the
self-renewal and differentiation of embryonic stem (ES) cells. However, the roles
of repressive histone modifications such as trimethylated histone 4 lysine 20
(H4K20me3) in pluripotency and development are largely unknown. RESULTS: Here, we
show that the histone lysine methyltransferase SMYD5 mediates H4K20me3 at
heterochromatin regions. Depletion of SMYD5 leads to compromised self-renewal,
including dysregulated expression of OCT4 targets, and perturbed differentiation.
SMYD5-bound regions are enriched with repetitive DNA elements. Knockdown of SMYD5
results in a global decrease of H4K20me3 levels, a redistribution of
heterochromatin constituents including H3K9me3/2, G9a, and HP1?, and
de-repression of endogenous retroelements. A loss of SMYD5-dependent silencing of
heterochromatin nearby genic regions leads to upregulated expression of
lineage-specific genes, thus contributing to the decreased self-renewal and
perturbed differentiation of SMYD5-depleted ES cells. CONCLUSIONS: Altogether,
these findings implicate a role for SMYD5 in regulating ES cell self-renewal and
H4K20me3-marked heterochromatin.