The first cleavage of the mouse zygote predicts the blastocyst axis

Berenika Plusa, Anna-Katerina Hadjantonakis, Dionne Gray, Karolina Piotrowska-Nitsche, Agnieszka Jedrusik, Virginia E. Papaioannou, David M. Glover and Magdalena Zernicka-Goetz ()
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Berenika Plusa: University of Cambridge
Anna-Katerina Hadjantonakis: Columbia University
Dionne Gray: University of Cambridge
Karolina Piotrowska-Nitsche: University of Cambridge
Agnieszka Jedrusik: University of Cambridge
Virginia E. Papaioannou: Columbia University
David M. Glover: University of Cambridge
Magdalena Zernicka-Goetz: University of Cambridge

Nature, 2005, vol. 434, issue 7031, 391-395

Abstract: Abstract One of the unanswered questions in mammalian development is how the embryonic–abembryonic axis of the blastocyst is first established. It is possible that the first cleavage division contributes to this process, because in most mouse embryos the progeny of one two-cell blastomere primarily populate the embryonic part of the blastocyst and the progeny of its sister populate the abembryonic part1,2,3,4. However, it is not known whether the embryonic–abembryonic axis is set up by the first cleavage itself, by polarity in the oocyte that then sets the first cleavage plane with respect to the animal pole, or indeed whether it can be divorced entirely from the first cleavage and established in relation to the animal pole. Here we test the importance of the orientation of the first cleavage by imposing an elongated shape on the zygote so that the division no longer passes close to the animal pole, marked by the second polar body. Non-invasive lineage tracing shows that even when the first cleavage occurs along the short axis imposed by this experimental treatment, the progeny of the resulting two-cell blastomeres tend to populate the respective embryonic and abembryonic parts of the blastocyst. Thus, the first cleavage contributes to breaking the symmetry of the embryo, generating blastomeres with different developmental characteristics.

Date: 2005
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DOI: 10.1038/nature03388

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