Fluorescent Reporters Distinguish Stem Cell Colony Subtypes During Somatic Cell Reprogramming

Area of Science:

• Stem cell biology
• Cellular reprogramming
• Developmental biology

Background:

• Somatic cell reprogramming initially aimed to generate induced pluripotent stem (iPS) cells.
• The reprogramming process is dynamic and heterogeneous, yielding distinct stem cell types like induced extraembryonic endoderm (iXEN) stem cells.
• Understanding the mechanisms of iXEN cell formation is challenging due to the slow, stochastic, and rare nature of the process.

Purpose of the Study:

• To establish reliable fluorescent reporters for studying iXEN stem cell formation.
• To investigate the expression patterns of key genes during somatic cell reprogramming.
• To identify markers that can distinguish between iPS and iXEN cell colonies.

Main Methods:

• Examined expression of fluorescent reporters for Nanog, Oct4, Gata4, and Gata6 during mouse somatic cell reprogramming.
• Evaluated reporter expression alone and in combination.
• Assessed the reliability of reporter combinations in distinguishing iPS and iXEN cell colonies.

Main Results:

• No single reporter reliably distinguished between iPS and iXEN cell formation.
• Simultaneous evaluation of Nanog and Gata4 expression effectively differentiated iPS and iXEN cell colonies.
• This dual reporter system provides a tool for studying iXEN cell development.

Conclusions:

• Simultaneous Nanog and Gata4 reporter expression is a reliable method for distinguishing iPS and iXEN stem cell colonies.
• This finding facilitates the study of mechanisms underlying divergent stem cell fate decisions during reprogramming.
• The developed reporter system aids in understanding the heterogeneity of stem cell generation.