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      Centrosomes and spindles in ascidian embryos and eggs.

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          Abstract

          During embryonic development and maternal meiotic maturation, positioning of the mitotic/meiotic spindle is subject to control mechanisms that meet the needs of the particular cell type. Here we review the methods, molecular tools, and the ascidian model we use to study three different ways in which centrosomes or spindles are positioned in three different cellular contexts. First, we review unequal cleavage in the ascidian germ lineage. In the germ cell precursors, a large macromolecular structure termed the centrosome-attracting body causes three successive rounds of unequal cleavage from the 8- to the 64-cell stage. Next, we discuss spindle positioning underlying the invariant cleavage pattern. Ascidian embryos display an invariant cleavage pattern whereby the mitotic spindle aligns in a predetermined orientation in every blastomere up to the gastrula stage (composed of 112 cells). Finally, we review methods and approaches to study meiotic spindle positioning in eggs.

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          Author and article information

          Journal
          Methods Cell Biol.
          Methods in cell biology
          Elsevier BV
          0091-679X
          0091-679X
          2015
          : 129
          Affiliations
          [1 ] Sorbonne Universités, UPMC Univ Paris 06, and CNRS, Laboratoire de Biologie du Développement de Villefranche-sur-mer, Observatoire Océanologique, Villefranche-sur-Mer, France.
          Article
          S0091-679X(15)00078-3
          10.1016/bs.mcb.2015.03.006
          26175446
          4c279d9c-cbed-4a95-86b0-f22a45be3def
          History

          Live cell imaging,Spindle pole,Polar body,Invariant cleavage,Centrosome,Unequal cleavage,Ascidian

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