Transcriptomic profiling of human embryonic stem cells upon cell cycle manipulation during pluripotent state...

Area of Science:

• Stem Cell Biology
• Cell Cycle Regulation
• Molecular Biology

Background:

• Distinct cell cycle structures are known to correlate with cell states, but their direct role in human embryonic stem cell (hESC) pluripotency remains unclear.
• Previous research suggests cell cycle machinery may influence pluripotency, but direct evidence and underlying mechanisms are lacking.

Purpose of the Study:

• To investigate the direct contribution of cell cycle machinery to the maintenance of pluripotency in hESCs.
• To identify specific cell cycle phases and molecular mechanisms that prevent pluripotent state dissolution (PSD).

Main Methods:

• Perturbation of S and G2 cell cycle phases in hESCs.
• Comprehensive gene expression analysis using time-course microarray experiments.
• Bioinformatic analysis of gene expression data.

Main Results:

• Specific perturbation of S and G2 phases prevents pluripotent state dissolution in hESCs.
• Active mechanisms within S and G2 phases, including the DNA damage checkpoint and Cyclin B1, promote pluripotency.
• Gene expression analysis revealed changes in the TGFβ signaling pathway, known for its role in hESC maintenance.

Conclusions:

• Cell cycle machinery plays a determinant role in maintaining hESC pluripotency.
• The DNA damage checkpoint and Cyclin B1 are key active mechanisms in S and G2 phases that support the pluripotent state.
• TGFβ signaling pathway interactions are implicated in the cell cycle's effect on pluripotent state maintenance.