Unexpected oocyte growth after follicular antrum formation in four marsupial species

Rodger, John C.; Giles, Ian G.; Mate, Karen E.

doi:10.1530/jrf.0.0960755

Cited by 30 publications

(11 citation statements)

References 9 publications

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“…The relatively long periods of transition between follicle types may be due to the amount of growth needed for the oocyte between those stages. Diameters of oogonia and oocytes of primordial and tertiary follicles were similar to data previously reported [10,35]. To our knowledge, this is the first study to report the growth of oocytes through the primary and secondary stages.…”

Section: Discussionsupporting

confidence: 88%

Gene Expression of the Tyrosine Kinase Receptor c-kit During Ovarian Development in the Brushtail Possum (Trichosurus vulpecula)1

Eckery

Lawrence

Juengel

et al. 2002

Biology of Reproduction

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Ovarian development and function have been extensively studied in eutherian species, with stem cell factor and its receptor, c-kit, having been shown to play key roles at various stages of these processes. In contrast, relatively little is known regarding ovarian development in marsupials. The aims of this study were, first, to establish the timing of key events during germ cell maturation and follicular development and, second, to determine the timing and cellular localization of gene expression for c-kit in the ovaries of a marsupial, the brushtail possum (Trichosurus vulpecula). For this study, ovaries were collected from possums ranging in age from Day 1 after birth to adult. Using stereology, the number of germ cells was found to increase rapidly during the first 60-100 days of life. This was followed by a sharp decline in number, wherein almost 90% of germ cells had disappeared by Day 180. From histological examinations, the time of initiation of meiosis, follicular formation, and follicular growth were determined to occur on Days 35, 50, and 60, respectively. Using in situ hybridization, c-kit gene expression was localized to germ cells and somatic cells during the first 15 days of life; however, after Day 30 and into adult life, c-kit expression was exclusive to germ cells. Results from this study suggest that the pattern of ovarian development is similar in marsupials to eutherians, and that c-kit may play a key role in germ cell development at various stages throughout life.

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Section: Discussionsupporting

confidence: 88%

Gene Expression of the Tyrosine Kinase Receptor c-kit During Ovarian Development in the Brushtail Possum (Trichosurus vulpecula)1

Eckery

Lawrence

Juengel

et al. 2002

Biology of Reproduction

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“…In comparison to other mammals, marsupial oocytes are much larger in size (w200-250 mm), their zona pellucida does not form corona radiata and is already shed off at ovulation, and a large yolk compartment takes up much of their cytoplasm (Rodger et al 1992, Breed et al 1994. All these characteristics make cryopreserving their oocytes far more difficult than cryopreserving the already hard-to-freeze eutherian mammals' oocytes, so the alternative is to cryopreserve embryos.…”

Section: Marsupialsmentioning

confidence: 99%

Current progress in oocyte and embryo cryopreservation by slow freezing and vitrification

2011

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Preservation of female genetics is currently done primarily by means of oocyte and embryo cryopreservation. The field has seen much progress during its four-decade history, progress driven predominantly by research in humans, cows, and mice. Two basic cryopreservation techniques rule the field -controlled-rate freezing, the first to be developed, and vitrification, which, in recent years, has gained a foothold. While much progress has been achieved in human medicine, the cattle industry, and in laboratory animals, this is far from being the case for most other mammals and even less so for other vertebrates. The major strides and obstacles in human and other vertebrate oocyte and embryo cryopreservation will be reviewed here.

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“…In no species has the ultrastructure of oocyte differentiation been correlated with a timetable of oogenesis and an analysis of oocyte growth. This is surprising considering the unusual growth pattern shown by some marsupial oocytes [Falconnier and Kress, 1992;Rodger et al, 1992] and the distinctive nature of marsupial oocytes, which develop prominent electronlucent vesicles during oogenesis [Breed et al, 1989;Breed and Leigh, 1990;Breed, 1996;Kress, 1996;Roberts and Breed, 1996;Ullmann and Butcher, 1996].…”

Section: Introductionmentioning

confidence: 99%

Oogenesis in the Marsupial Stripe-Faced Dunnart, <i>Sminthopsis macroura</i>

Kress

Merry

Selwood

2001

Cells Tissues Organs

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The timetable of oogenesis in Sminthopsis macroura is accelerated like in other marsupials showing relatively early maturation of the female. On the day of parturition (day 0) migration of primordial germ cells to the indifferent gonads has been completed. Follicular growth seems not to correspond to the biphasic pattern, in which oocyte and follicle grow synchronously until antral stages when only the follicle increases in size, but shows a continuous growth of the oocyte and the follicle up to the time of ovulation. During primordial and early primary follicle stage a paranuclear complex is present in the oocyte, consisting mainly of smooth tubules of endoplasmic reticulum. Cortical granules appear early in oocytes in secondary follicles. The conspicuous inclusions in the antral follicle are the clusters of electron-lucent vesicles in the oocyte. These inclusions grow from multivesicular bodies (MVB), which are formed from Golgi and endoplasmic reticulum vesicles. Further increase in the size of MVB involves the incorporation of endocytic vesicles and the coalescence of larger vesicles. The polarized nature of the oocyte at ovulation is due in part to the to accumulation of these vesicles in the cytoplasm opposite the eccentrically placed nuclear material.

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Unexpected oocyte growth after follicular antrum formation in four marsupial species

Cited by 30 publications

References 9 publications

Gene Expression of the Tyrosine Kinase Receptor c-kit During Ovarian Development in the Brushtail Possum (Trichosurus vulpecula)1

Gene Expression of the Tyrosine Kinase Receptor c-kit During Ovarian Development in the Brushtail Possum (Trichosurus vulpecula)1

Current progress in oocyte and embryo cryopreservation by slow freezing and vitrification

Oogenesis in the Marsupial Stripe-Faced Dunnart, <i>Sminthopsis macroura</i>

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