Zinc finger proteins orchestrate active gene silencing during embryonic stem cell differentiation

Nucleic Acids Research
Sojung KwakHong-Duk Youn

Abstract

Transcription factors and chromatin remodeling proteins control the transcriptional variability for ESC lineage commitment. During ESC differentiation, chromatin modifiers are recruited to the regulatory regions by transcription factors, thereby activating the lineage-specific genes or silencing the transcription of active ESC genes. However, the underlying mechanisms that link transcription factors to exit from pluripotency are yet to be identified. In this study, we show that the Ctbp2-interacting zinc finger proteins, Zfp217 and Zfp516, function as linkers for the chromatin regulators during ESC differentiation. CRISPR-Cas9-mediated knock-outs of both Zfp217 and Zfp516 in ESCs prevent the exit from pluripotency. Both zinc finger proteins regulate the Ctbp2-mediated recruitment of the NuRD complex and polycomb repressive complex 2 (PRC2) to active ESC genes, subsequently switching the H3K27ac to H3K27me3 during ESC differentiation for active gene silencing. We therefore suggest that some zinc finger proteins orchestrate to control the concise epigenetic states on active ESC genes during differentiation, resulting in natural lineage commitment.

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Methods Mentioned

BETA
fluorescence-activated cell sorting
PCR
immunoprecipitation
ChIP
ChIP-seq
co-immunoprecipitation
FACS

Software Mentioned

Bowtie2
ChromHMM
samtools
MACS
GenScript
TreeView
HOMER
BEDOPS
STAR
Cluster

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