Evidence for close molecular proximity between reverting and undifferentiated cells

Area of Science:

• Cell Biology
• Epigenetics
• Developmental Biology

Background:

• Waddington's epigenetic landscape model describes cell differentiation as a one-way process.
• Recent findings suggest committed cells retain plasticity, potentially reverting to a more pluripotent state.
• The molecular mechanisms underlying this cellular plasticity remain largely unexplored.

Purpose of the Study:

• To molecularly characterize the reversion process of differentiating chicken erythrocytic progenitors (T2EC).
• To investigate the plasticity of committed cells using single-cell transcriptomic data.
• To understand the dynamic molecular network behavior during cell differentiation and reversion.

Main Methods:

• Chicken erythrocytic progenitors (T2EC) were cultured in self-renewal and differentiation media.
• Cells were analyzed at different time points: self-renewal (0H), 24-hour differentiation (24H), and 48-hour reversion (48H).
• Single-cell RT-qPCR and single-cell RNA sequencing were employed for transcriptomic analysis, followed by advanced statistical analysis.

Main Results:

• Dimensional reduction revealed a strong overlap between 0H (undifferentiated) and 48H reverting cells.
• Statistical analysis showed no significant molecular differences between 0H and 48H reverting cells.
• Sparse PLS analysis identified only 3 genes that discriminate between reverting and undifferentiated cells, indicating near-complete molecular recovery.

Conclusions:

• Reverting cells achieve a molecular state almost identical to their undifferentiated counterparts.
• This study demonstrates significant physiological and molecular plasticity in differentiating cells.
• The observed plasticity is likely a result of the dynamic nature of the underlying molecular regulatory network.