Control of the proportion of inner cells by asymmetric divisions and the ensuing resilience of cloned rabbit embryos.

ABSTRACT: Mammalian embryo cloning by nuclear transfer has a low success rate. This is hypothesized to correlate with a high variability of early developmental steps that segregate outer cells, which are fated to extra-embryonic tissues, from inner cells, which give rise to the embryo proper. Exploring the cell lineage of wild-type embryos and clones, imaged in toto until hatching, highlights the respective contributions of cell proliferation, death and asymmetric divisions to phenotypic variability. Preferential cell death of inner cells in clones, probably pertaining to the epigenetic plasticity of the transferred nucleus, is identified as a major difference with effects on the proportion of inner cell. In wild type and clones, similar patterns of outer cell asymmetric divisions are shown to be es

SUBMITTER: Fabreges D 

PROVIDER: S-EPMC5964649 | biostudies-literature | 2018 Apr

REPOSITORIES: biostudies-literature