Oogenesis: Variations on a theme

Cooley, Lynn

doi:10.1002/dvg.1020160103

Cited by 10 publications

(4 citation statements)

References 41 publications

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“…This leads to the separation of oocytes that associate with somatic cells and constitute primordial ovarian follicles. Above observations support the idea that the formation of germ-line cysts is the evolutionarily conserved phase in the development of the female gamete throughout the animal kingdom (see Cooley, 1995; Pepling et al, 1999; Matova and Cooley, 2001 for a review).…”

Section: Introductionsupporting

confidence: 77%

Early oogenesis in the short‐tailed fruit bat Carollia perspicillata: Transient germ cell cysts and noncanonical intercellular bridges

Lechowska

Biliński

Rasweiler

et al. 2011

Genesis

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The ovaries of early embryos (40 days after fertilization) of the bat Carollia perspicillata contain numerous germ-line cysts, which are composed of 10 to 12 sister germ cells (cystocytes). The variability in the number of cystocytes within the cyst and between the cysts (that defies the Giardina rule) indicates that the mitotic divisions of the cystoblast are asynchronous in this bat species. The serial section analysis showed that the cystocytes are interconnected via intercellular bridges that are atypical, strongly elongated, short-lived, and rich in microtubule bundles and microfilaments. During the later stages of embryonic development (44–46 days after fertilization), the somatic cells penetrate the cyst, and their cytoplasmic projections separate individual oocytes. Separated oocytes surrounded by the single layer of somatic cells constitute the primordial ovarian follicles. The oocytes of C. perspicillata are similar to mouse oocytes and are asymmetric. In both species, this asymmetry is clearly recognizable in the localization of the Golgi complexes. The presence of germ-line cysts and intercellular bridges (although non-canonical) in the fetal ovaries of C. perspicillata indicate that the formation of germ-line cysts is an evolutionarily conserved phase in the development of the female gametes throughout the animal kingdom.

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Section: Introductionsupporting

confidence: 77%

Early oogenesis in the short‐tailed fruit bat Carollia perspicillata: Transient germ cell cysts and noncanonical intercellular bridges

Lechowska

Biliński

Rasweiler

et al. 2011

Genesis

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“…The maturing oocyte also undergoes cytoplasmic modifications in preparation for early developmental events that occur upon fertilization, such as sperm nuclear decondensation22 and calcium oscillations23. The end of meiotic maturation is marked by the establishment of a second meiotic arrest at metaphase II (MII)24, at which point this single cell is now called an egg.…”

Section: Introductionmentioning

confidence: 99%

Zinc availability regulates exit from meiosis in maturing mammalian oocytes

et al. 2010

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Cellular metal ion fluxes are known in the case of alkali and alkaline earth metals but not well documented for transition metals. Here, we describe major changes in the zinc physiology of the mammalian oocyte as it matures and initiates embryonic development. Single-cell elemental analysis of mouse oocytes by synchrotron-based x-ray fluorescence microscopy (XFM) revealed a 50% increase in total zinc content within the 12-14 hour period of meiotic maturation. Perturbation of zinc homeostasis with a cell-permeable small molecule chelator blocked meiotic progression past telophase I. Zinc supplementation rescued this phenotype when administered prior to this meiotic block. However, following telophase arrest, zinc triggered parthenogenesis, suggesting that exit from this meiotic step is tightly regulated by the availability of a zinc-dependent signal. These results implicate the zinc bolus acquired during meiotic maturation as an important part of the maternal legacy to the embryo.

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“…Different organisms, particularly insects, have a variety of mechanisms for making an oocyte 121. In insects with panoistic ovaries, there is only one nucleus per oocyte, whereas in the meroistic ovary, oocytes accumulate transcripts and other products derived from oocyte sister cells, the nurse cells 122–125. In contrast, a single nucleus provides the required gene products in oocytes of most vertebrates 121.…”

Section: Multinucleated Oogenesismentioning

confidence: 99%

Developmental diversity of amphibians

Elinson

Pino

2011

WIREs Developmental Biology

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The current model amphibian, Xenopus laevis, develops rapidly in water to a tadpole which metamorphoses into a frog. Many amphibians deviate from the X. laevis developmental pattern. Among other adaptations, their embryos develop in foam nests on land or in pouches on their mother’s back or on a leaf guarded by a parent. The diversity of developmental patterns includes multinucleated oogenesis, lack of RNA localization, huge non-pigmented eggs, and asynchronous, irregular early cleavages. Variations in patterns of gastrulation highlight the modularity of this critical developmental period. Many species have eliminated the larva or tadpole and directly develop to the adult. The wealth of developmental diversity among amphibians coupled with the wealth of mechanistic information from X. laevis permit comparisons that provide deeper insights into developmental processes.

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Oogenesis: Variations on a theme

Cited by 10 publications

References 41 publications

Early oogenesis in the short‐tailed fruit bat Carollia perspicillata: Transient germ cell cysts and noncanonical intercellular bridges

Early oogenesis in the short‐tailed fruit bat Carollia perspicillata: Transient germ cell cysts and noncanonical intercellular bridges

Zinc availability regulates exit from meiosis in maturing mammalian oocytes

Developmental diversity of amphibians

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