Parthenogenesis in Insects: The Centriole Renaissance

摘要: Building a new organism usually requires the contribution of two differently shaped haploid cells, male and female gametes, each providing its genetic material to restore diploidy born zygote. The successful execution this process defined sequential steps that must be completed in space time. Otherwise, development fails. Relevant among earlier are pronuclear migration formation first mitotic spindle promote mixing parental chromosomes zygotic nucleus. A complex microtubule network ensures proper these processes. Instrumental organization bipolar assembly is distinct non-membranous organelle, centrosome. Centrosome inheritance during fertilization biparental, since both gametes provide essential components build functional This model does not explain, however, centrosome parthenogenetic development, special mode sexual reproduction which unfertilized egg develops without gamete. Moreover, whereas relevant example cells actively check presence only one centrosome, avoid multipolar formation, eggs ensured, at least insects, by de novo multiple centrosomes.