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Published on: June 1, 2018
Inhibition of Cell Division and DNA Replication Impair Mouse-Naïve Pluripotency Exit
Ariel Waisman1, Camila Vazquez Echegaray1, Claudia Solari1
1Universidad de Buenos Aires, Laboratorio de Regulación Génica en Células Madre, Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina; CONICET-Universidad de Buenos Aires, Instituto de Química Biológica (IQUIBICEN), Buenos Aires, Argentina.
Mouse embryonic stem cell differentiation requires DNA replication. This process, occurring before the S phase in G1, is crucial for initiating changes in cell identity and lineage priming.
Area of Science:
- Stem cell biology
- Cell cycle regulation
- Developmental biology
Background:
- The cell cycle influences cell fate decisions, but its role in stem cell differentiation, particularly DNA replication and mitosis, remains understudied.
- Understanding these cell cycle phases as potential "windows of opportunity" for cell identity changes is critical.
Purpose of the Study:
- To investigate the role of DNA replication and mitosis in mouse embryonic stem cell differentiation.
- To determine if cell cycle progression acts as a critical window for initiating changes in cell identity during pluripotency exit.
Main Methods:
- Established synchronized cultures of mouse embryonic stem cells exiting pluripotency.
- Analyzed transcriptional changes during cell cycle progression.
- Impaired DNA replication to assess its impact on differentiation, including in the absence of p53 activity.
Main Results:
- Initial transcriptional changes during pluripotency exit do not require mitosis.
- Conversion to primed pluripotency and lineage priming are linked to the G1 phase.
- Impaired DNA replication significantly blocked the transcriptional switch to primed pluripotency, independent of p53-mediated DNA damage response.
Conclusions:
- DNA replication plays a critical role in mouse embryonic stem cell differentiation.
- Pluripotent cells appear most receptive to differentiation signals during the G1 phase, prior to DNA replication (S phase).
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