A continuous molecular roadmap to iPSC reprogramming through progression analysis of single-cell mass cytometry

Area of Science:

• Cell Biology
• Biotechnology
• Genomics

Background:

• Cellular reprogramming is crucial for regenerative medicine and understanding development.
• Existing methods lack the resolution to capture dynamic transitions during reprogramming.
• Simultaneous multi-parametric analysis at the single-cell level is needed.

Purpose of the Study:

• To develop and apply time-resolved single-cell analysis for mapping cellular reprogramming.
• To identify common molecular landmarks and distinct cell fate trajectories during reprogramming.
• To establish a continuous molecular roadmap of the reprogramming process.

Main Methods:

• Utilized mass cytometry to simultaneously measure pluripotency, differentiation, cell-cycle, and signaling markers.
• Performed time-resolved progression analysis on single-cell data from three independent reprogramming systems.
• Constructed a continuous molecular roadmap illustrating cellular transitions.

Main Results:

• Identified a common set of reprogramming landmarks despite variations in transcription factor stoichiometry.
• Observed a transition from Oct4(high)Klf4(high) cells to a partially reprogrammed CD73(high)CD104(high)CD54(low) state.
• Discovered that Ki67(high) cells bifurcate into either an ESC-like or a mesendoderm-like population.

Conclusions:

• The developed methods enable detailed study of dynamic cellular processes.
• The identified roadmap provides insights into the fundamental mechanisms of cellular reprogramming.
• This approach is applicable to studying other complex biological systems like cancer and development.