Role for sperm in spatial patterning of the early mouse embryo - PubMed (original) (raw)
. 2001 Jan 25;409(6819):517-21.
doi: 10.1038/35054069.
Affiliations
- PMID: 11206548
- DOI: 10.1038/35054069
Role for sperm in spatial patterning of the early mouse embryo
K Piotrowska et al. Nature. 2001.
Abstract
Despite an apparent lack of determinants that specify cell fate, spatial patterning of the mouse embryo is evident early in development. The axis of the post-implantation egg cylinder can be traced back to organization of the pre-implantation blastocyst. This in turn reflects the organization of the cleavage-stage embryo and the animal-vegetal axis of the zygote. These findings suggest that the cleavage pattern of normal development may be involved in specifying the future embryonic axis; however, how and when this pattern becomes established is unclear. In many animal eggs, the sperm entry position provides a cue for embryonic patterning, but until now no such role has been found in mammals. Here we show that the sperm entry position predicts the plane of initial cleavage of the mouse egg and can define embryonic and abembryonic halves of the future blastocyst. In addition, the cell inheriting the sperm entry position acquires a division advantage and tends to cleave ahead of its sister. As cell identity reflects the timing of the early cleavages, these events together shape the blastocyst whose organization will become translated into axial patterning after implantation. We present a model for axial development that accommodates these findings with the regulative nature of mouse embryos.
Comment in
- Sperm and mammalian polarity.
Pedersen RA. Pedersen RA. Nature. 2001 Jan 25;409(6819):473-4. doi: 10.1038/35054182. Nature. 2001. PMID: 11206532 No abstract available.
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