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Asynchrony in the Exit from Naive Pluripotency (2024)

ABSTRACT: The asynchrony in the exit from naive pluripotency cannot be explained by differences in the cell cycle phase

PROVIDER: PRJEB74673 | ENA |

REPOSITORIES: ENA

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			Action	DRS
		Other
	ERR12865900.fastq.gz	Fastqsanger.gz
	ERR12865901.fastq.gz	Fastqsanger.gz
	ERR12865902.fastq.gz	Fastqsanger.gz
	ERR12865903.fastq.gz	Fastqsanger.gz

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Asynchrony in the Exit from Naive Pluripotency

Project description:The asynchrony in the exit from naive pluripotency cannot be explained by differences in the cell cycle phase

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Project description:Stem cells intrinsically express a subset of genes which are normally associated with interferon stimulation and the innate immune response. However, expression of these interferon stimulated genes (ISG) in stem cells is independent from external stimuli such as viral infection. Here, we show that the interferon regulatory factor 1, Irf1, is directly controlled by the murine formative pluripotency gene regulatory network and transiently upregulated during the transition from naive to formative pluripotency. IRF1 binds to regulatory regions of a conserved set of ISGs and is required for their faithful expression upon exit from naive pluripotency. We show that in the absence of IRF1, cells exiting the naive pluripotent stem cell state are more susceptible to viral infection. Irf1 therefore acts as a link between the formative pluripotency network, regulation of innate immunity genes and defense against viral infections during formative pluripotency.

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KLF4 Nuclear Export Requires ERK Activation and Initiates Exit from Naive Pluripotency.

Project description:Cooperative action of a transcription factor complex containing OCT4, SOX2, NANOG, and KLF4 maintains the naive pluripotent state; however, less is known about the mechanisms that disrupt this complex, initiating exit from pluripotency. We show that, as embryonic stem cells (ESCs) exit pluripotency, KLF4 protein is exported from the nucleus causing rapid decline in Nanog and Klf4 transcription; as a result, KLF4 is the first pluripotency transcription factor removed from transcription-associated complexes during differentiation. KLF4 nuclear export requires ERK activation, and phosphorylation of KLF4 by ERK initiates interaction of KLF4 with nuclear export factor XPO1, leading to KLF4 export. Mutation of the ERK phosphorylation site in KLF4 (S132) blocks KLF4 nuclear export, the decline in Nanog, Klf4, and Sox2 mRNA, and differentiation. These findings demonstrate that relocalization of KLF4 to the cytoplasm is a critical first step in exit from the naive pluripotent state and initiation of ESC differentiation.

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