Cellular diversity within embryonic stem cells: pluripotent clonal sublines show distinct differentiation potential

Area of Science:

• Developmental Biology
• Stem Cell Biology
• Genetics

Background:

• Embryonic stem cells (ESCs) are derived from the inner cell mass (ICM) and are theoretically considered homogeneous pluripotent cells.
• Understanding ESC heterogeneity is crucial for their effective use in regenerative medicine and research.

Purpose of the Study:

• To investigate the concept of homogeneity in embryonic stem cells (ESCs).
• To characterize the differentiation potential of individual ESCs and their progeny.
• To explore the existence of clonal diversity within ESC populations.

Main Methods:

• Experimental characterization of progenies derived from single parental mouse ESCs.
• Flow cytometry analysis of neural differentiation.
• Live imaging of individual ESCs.
• Generation of clonal sublines via limit dilution.
• Transcriptome analysis of undifferentiated sublines and embryoid bodies.

Main Results:

• A fraction of ESCs undergoing neural differentiation produced cells with undesired phenotypes.
• Significant variations in neuronal generation capacity were observed among individual parental ESCs, suggesting clonal diversity.
• Undifferentiated clonal sublines exhibited distinct gene expression profiles and differentiation potentials, despite expressing pluripotency markers.

Conclusions:

• Pluripotent embryonic stem cells (ESCs) comprise individual cell types with distinct differentiation potentials.
• These findings challenge the notion of ESC homogeneity and highlight inherent cellular diversity.
• The identified cellular individualities offer novel insights into ESC biology and potential tools for future in vitro and in vivo applications.