Embryonic stem cells alone are able to support fetal development in the mouse

Area of Science:

• Developmental Biology
• Stem Cell Biology
• Genetics

Background:

• Embryonic stem (ES) cells are derived from the inner cell mass (ICM) of blastocysts.
• Understanding ES cell developmental potential is crucial for regenerative medicine and developmental studies.
• Tetraploid complementation is a method to assess the developmental totipotency of cells.

Purpose of the Study:

• To compare the developmental potential of ES cells versus ICMs.
• To investigate the contribution of ES cells to all fetal lineages using tetraploid complementation.
• To explore the viability of ES-cell-derived offspring.

Main Methods:

• Aggregation of ES cells and ICMs with tetraploid embryos.
• Analysis of chimeric embryos and newborns using GPI isozyme analysis and DNA in situ hybridization.
• Assessment of ES cell contribution to various embryonic and extraembryonic tissues.

Main Results:

• ES cells colonized somatic tissues less efficiently than ICMs in diploid chimeras.
• In tetraploid complementation, newborns were predominantly ICM- or ES-derived, with tetraploid cells in extraembryonic lineages.
• ES cells fully contributed to the fetus, amnion, and yolk sac mesoderm, but ES-derived newborns did not survive post-birth.

Conclusions:

• ES cells possess the potential to support complete fetal development.
• Tetraploid complementation is a valuable tool for studying ES cell developmental capacity in all fetal lineages.
• The unexplained failure of ES-derived newborn survival requires further investigation.