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2016 ; 11
(6
): 389-97
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Characterization of non-canonical Polycomb Repressive Complex 1 subunits during
early mouse embryogenesis
#MMPMID27081692
Eid A
; Torres-Padilla ME
Epigenetics
2016[Jun]; 11
(6
): 389-97
PMID27081692
show ga
An intense period of chromatin remodeling takes place after fertilization in
mammals, which is thought necessary for epigenetic reprogramming to start a new
developmental program. While much attention has been given to the role of
Polycomb Repressive Complex 2 (PRC2) and to canonical PRC1 complexes during this
process, little is known as to whether there is any contribution of non-canonical
PRC1 in shaping the chromatin landscape after fertilization. Here, we first
describe in detail the temporal dynamics and abundance of H2A ubiquitylation
(H2AK119ub), a histone modification catalyzed by PRC1, during pre-implantation
mouse development. In addition, we have analyzed the presence of the 2
characteristic subunits of non-canonical PRC1 complexes, RYBP and its homolog
YAF-2. Our results indicate that H2AK119ub is inherited from the sperm, rapidly
removed from the paternal chromatin after fertilization, but detected again prior
to the first mitosis, suggesting that PRC1 activity occurs as early as the
zygotic stage. RYBP and YAF-2, together with the non-canonical subunit L3MBTL2,
are all present during pre-implantation development but show different temporal
dynamics. While RYBP is absent in the zygote, it is strongly induced from the
4-cell stage onwards. YAF-2 is inherited maternally and localizes to the
pericentromeric regions in the zygote, is strongly induced between the 2- and
4-cell stages but then remains weak to undetectable subsequently. All together,
our data suggest that non-canonical PRC1 is active during pre-implantation
development and should be regarded as an additional component during epigenetic
reprogramming and in the establishment of cellular plasticity of the early
embryo.