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Dev Dyn. 2010 Aug;239(8):2172-89. doi: 10.1002/dvdy.22349.

Ooplasmic segregation in the zebrafish zygote and early embryo: pattern of ooplasmic movements and transport pathways.

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Laboratory of Developmental Cell Biology, Department of Biology, Faculty of Sciences, University of Chile, Santiago, Chile.


Patterns of cytoplasmic movements and organization of transport pathways were examined in live or fixed zygotes and early zebrafish embryos using a variety of techniques. The zygote blastodisc grows by accumulation of ooplasm, transported to the animal pole from distinct sectors of ecto- and endoplasm at different speeds and developmental periods, using specific pathways or streamers. Slow transport (5 microm/min) occurs during the first interphase along short streamers, whereas fast transport (9.6-40 microm/min) takes place during the first cleavage division along axial and meridional streamers. Interconnections between streamers allow cargoes to change their speed and final destination. A similar sequence of events occurs during the following divisions. A complex network of microtubules and actin filaments in the endo- and ectoplasm appears to be involved in the transport of inclusions and mRNAs. Actin-dependent intermittent pulsations provoked high-speed back-and-forth movements of cytoplasm that may contribute to redistribution of organelles and maternal determinants.

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