Effect on Inhibition of Micromere Segregation on the Mitotic Pattern in the Sea Urchin Embryo |
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| Authors: | SILVANA FILOSA PIERO ANDREUCCETTI ELIO PARISI ALBERTO MONROY |
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| Institution: | Istituto di Istologia ed Embriologia, University of Naples. 80131, Naples;Istituto di Embriologia Molecolare, 80072 Arco Felice, Naples;Stazione Zoologica, 80121 Naples, Italy |
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| Abstract: | Detergent treatment of sea urchin eggs at the mid 4-cell stage results in prevention of micromere segregation at the fourth cleavage. In these embryos not only the formation of the primary mesenchyme is suppressed, but synchrony of cell division, which is the rule during the first four cleavage cycles, continues for several cycles after the 16-cell stage while the typical mitotic phase wave that sets in after micromere segregation is abolished.
These results support the hypothesis that micromeres act as coordinators of the mitotic activity of the embryo. |
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