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Development, Vol 120, Issue 12 3419-3426, Copyright © 1994 by Company of Biologists

JOURNAL ARTICLES

Strain-specific differences in mouse oocytes and their contributions to epigenetic inheritance

KE Latham
Fels Institute for Cancer Research and Molecular Biology, Temple University School of Medicine, Philadelphia, PA 19140.

Previous experiments revealed a strain-dependent effect of egg cytoplasm on the developmental potential of androgenetic (two paternal genomes) mouse embryos. Eggs obtained from C57BL/6 mice supported androgenone development to the blastocyst stage at a much higher frequency than eggs from DBA/2 mice. Transient exposure of paternal pronuclei to DBA/2 egg cytoplasm also compromised development, indicating that the DBA/2 egg cytoplasm negatively affected the ability of paternal pronuclei to support blastocyst formation. An essential first step toward understanding the molecular mechanism by which egg modifier factors influence gene expression is to determine the number of loci that are responsible for the strain difference. To do this, (B6D2)F1 hybrid females were backcrossed to DBA/2 males and the eggs from individual female progeny assayed for their ability to support androgenetic development. Approximately one fourth of the backcross females produced eggs that failed to support androgenone development, indicating that two independently segregating genetic loci are most likely responsible for the difference between DBA/2 and C57BL/6 egg phenotypes. Comparison of DBA/2 and C57BL/6 oocytes by two-dimensional protein gel electrophoresis revealed at least 17 proteins that exhibited significant, reproducible, quantitative differences in rates of synthesis. All of these proteins were synthesized in (B6D2)F1 oocytes. These data, combined with the previous observation that the C57BL/6 egg phenotype is dominant, are consistent with a model in which a C57BL/6 allele at either locus provides a protective function, either by antagonizing the actions of the DBA/2 alleles or by providing, through partial or complete redundancy, a function not provided by the DBA/2 alleles.


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© The Company of Biologists Ltd 1994