Development to term of mouse androgenetic aggregation chimeras

Area of Science:

• Developmental biology
• Genetics
• Stem cell biology

Background:

• Diploid androgenetic eggs, possessing two sperm-derived genomes, exhibit limited development.
• Previous research suggested androgenetic eggs cannot be rescued in aggregation chimeras beyond early embryonic stages.

Purpose of the Study:

• To re-evaluate the developmental potential of androgenetic aggregation chimeras.
• To compare developmental outcomes across different mouse strains (129/Sv, BALB/c, CD-1).
• To investigate the viability and pluripotency of androgenetic embryonic stem (ES) cells.

Main Methods:

• Creation of androgenetic aggregation chimeras using eggs from 129/Sv, BALB/c, and CD-1 mouse strains.
• Comparison of developmental potential with previously generated androgenetic ES cell chimeras.
• Analysis of postnatal chimerism and skeletal abnormalities.

Main Results:

• Androgenetic aggregation chimeras showed lower viability compared to ES cell chimeras, with abnormal embryoproper development.
• Occasional term development was observed in 129/Sv strain aggregation chimeras, with one postnatal chimera exhibiting skeletal abnormalities.
• Postnatal chimerism confirmed the pluripotency of androgenetic eggs and conservation of paternal imprinting in ES cells.
• BALB/c and CD-1 strains showed limited or no term development in aggregation chimeras.

Conclusions:

• The developmental potential of androgenetic aggregation chimeras is strain-dependent.
• Androgenetic ES cells demonstrate pluripotency and retain imprinting patterns.
• ES cell-mediated rescue offers improved developmental potential compared to traditional aggregation methods for androgenetic embryos.