Restarting life: fertilization and the transition from meiosis to mitosis
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چکیده
منابع مشابه
giant nuclei is essential in the cell cycle transition from meiosis to mitosis.
At the transition from meiosis to cleavage mitoses, Drosophila requires the cell cycle regulators encoded by the genes, giant nuclei (gnu), plutonium (plu) and pan gu (png). Embryos lacking Gnu protein undergo DNA replication and centrosome proliferation without chromosome condensation or mitotic segregation. We have identified the gnu gene encoding a novel phosphoprotein dephosphorylated by Pr...
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THE origins of meiosis in early eukaryotic history have never been satisfactorily explained. Since the reduction-division process in meiosis is essential for sexual life cycles, discussion of the origins of meiosis has been closely tied to debates about the evolutionary value of sex itself and the selective pressures for its maintenance. Yet the cytological events involved in the origins of mei...
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Introduction As we discussed in class, biological growth is a multi-dimensional phenomena. In essence, the basic unit of life, the cell, must duplicate itself. One "mother" cell must become two "daughter" cells, through the process of Cell Division, mostly MITOSIS. This is a completely asexual event and involves replication of the nucleus and its constituents and dividing up of the cytoplasm, t...
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پس ازفروپاشی شوروی،رشد منابع نفت و گاز، آسیای میانه و قفقاز را در یک بازی ژئوپلتیکی انرژی قرار داده است. با در نظر گرفتن این منابع هیدروکربنی، این منطقه به یک میدانجنگ و رقابت تجاری برای بازی های ژئوپلتیکی قدرت های بزرگ جهانی تبدیل شده است. روسیه منطقه را به عنوان حیات خلوت خود تلقی نموده و علاقمند به حفظ حضورش می باشد تا همانند گذشته گاز طبیعی را به وسیله خط لوله مرکزی دریافت و به عنوان یک واس...
15 صفحه اولFrom meiosis to mitosis - the sperm centrosome defines the kinetics of spindle assembly after fertilization in Xenopus.
Bipolar spindle assembly in the vertebrate oocyte relies on a self-organization chromosome-dependent pathway. Upon fertilization, the male gamete provides a centrosome, and the first and subsequent embryonic divisions occur in the presence of duplicated centrosomes that act as dominant microtubule organizing centres (MTOCs). The transition from meiosis to embryonic mitosis involves a necessary ...
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ژورنال
عنوان ژورنال: Nature Reviews Molecular Cell Biology
سال: 2013
ISSN: 1471-0072,1471-0080
DOI: 10.1038/nrm3643