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2016 ; 15
(10
): 1317-24
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Epigenetic regulation by BAF (mSWI/SNF) chromatin remodeling complexes is
indispensable for embryonic development
#MMPMID26986003
Nguyen H
; Sokpor G
; Pham L
; Rosenbusch J
; Stoykova A
; Staiger JF
; Tuoc T
Cell Cycle
2016[May]; 15
(10
): 1317-24
PMID26986003
show ga
The multi-subunit chromatin-remodeling SWI/SNF (known as BAF for
Brg/Brm-associated factor) complexes play essential roles in development. Studies
have shown that the loss of individual BAF subunits often affects local chromatin
structure and specific transcriptional programs. However, we do not fully
understand how BAF complexes function in development because no animal mutant had
been engineered to lack entire multi-subunit BAF complexes. Importantly, we
recently reported that double conditional knock-out (dcKO) of the BAF155 and
BAF170 core subunits in mice abolished the presence of the other BAF subunits in
the developing cortex. The generated dcKO mutant provides a novel and powerful
tool for investigating how entire BAF complexes affect cortical development.
Using this model, we found that BAF complexes globally control the key
heterochromatin marks, H3K27me2 and -3, by directly modulating the enzymatic
activity of the H3K27 demethylases, Utx and Jmjd3. Here, we present further
insights into how the scaffolding ability of the BAF155 and BAF170 core subunits
maintains the stability of BAF complexes in the forebrain and throughout the
embryo during development. Furthermore, we show that the loss of BAF complexes in
the above-described model up-regulates H3K27me3 and impairs forebrain development
and embryogenesis. These findings improve our understanding of epigenetic
mechanisms and their modulation by the chromatin-remodeling SWI/SNF complexes
that control embryonic development.