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Extra info for Current Topics in Developmental Biology, Vol. 39
68-91. Wiley, Chichester. Lawson, K. , and Pedersen, R. A. (1992). Early mesoderm formation in the mouse embryo. In “Formation and Differentiation of Early Embryonic Mesoderm” (R. Bellairs, E. J. Saunders, and L. ), pp. 33-46. Plenum, New York. Lawson, K. , and Pedersen, R. A. (1991). Clonal analysis of epiblast fate during germ layer formation in the mouse embryo. Deuelopmenr (Cambridge, UK) 113, 891-9 I I. 32 Karen M. Downs Lozier, J. , and Brinkhous, K. M. (1994). Gene therapy and the hemophilias.
Asymmetry is first discernible shortly before fertilization with movement of the oocyte’s nucleus toward one pole, the future animal pole, which normally becomes the anterior of the embryo. 2. Egg-Embryo Relationships in Mice 39 Sperm penetration and development of the male pronucleus normally occur at the opposite vegetal pole, the embryo’s presumptive posterior, and appear to induce the flow of cytoplasm, including P granules, toward this region and drive cortical F actin away from it. If sperm penetration is made to occur at the animal pole of the egg, as defined by eccentricity of its nucleus, then the AV polarity of the zygote and hence the AP axis of the embryo are reversed (Goldstein and Hird, 1996).
Collectively, such findings show that the OA axis can be specified before the first cleavage in undisturbed development, even though the eggs of sea urchins, unlike those of certain other echinoderms, show no morphological signs of bilaterality before fertilization. However, various experimental findings argue that bilateral symmetry may, nevertheless, already be present in a cryptic form. Thus, eggs activated artificially can yield bilateral larvae and, more significantly, the pairs of meridional halves of eggs bisected before fertilization may differentiate as right-left or oral-aboral twins (Horstadius, 1973).