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Rouxs Arch Dev Biol
1990 Jun 01;1988:433-442. doi: 10.1007/BF00399053.
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Cell surface proteins during early Xenopus development: analysis of cell surface proteins and total glycoproteins provides evidence for a maternal glycoprotein pool.
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The populations of cell surface proteins and total glycoproteins were investigated in early Xenopus embryos through lectin staining, affinity binding of glycoproteins to lectins, and use of a succinimide ester to biotinylate cell surface molecules. Lectin staining shows that the egg is endowed with a thick layer of surface glycoprotein, and that glycoprotein is immediately detected on the newly formed membranes of nascent blastomeres. The amount of glycoprotein found in eggs and early embryos remains constant, and electrophoretic analysis reveals no changes in abundant lectin-binding glycoproteins through the neurula stage. In contrast, the amount of cell surface protein increases dramatically from the 2-cell to the gastrula stages. Despite this quantiative increase, only a small number of differences in cell surface proteins were detected during this period. A series of bands was detected which appears to be specific to the outer surface of the embryo. Because the populations of surface proteins and of total glycoproteins overlap to a great extent, the increase in cell surface protein, in the absence of a change in total glycoprotein, indicates the presence of a maternal glycoprotein pool in the Xenopus egg, from which the cell surface proteins of embryonic blastomeres are recruited.
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