Effect of 17β-Estradiol on Somatic and Germ Cell Subpopulations in the Ovary of the Newly Hatched Chick

Méndez-Herrera, Carmen; Salcedo, Pablo Hofmann; Pedernera, E.

doi:10.1006/gcen.1993.1022

Cited by 6 publications

(4 citation statements)

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“…Female chickens generate a maximum of approximately 400,000 primordial oogonia during embryogenesis in their active ovary by mitotic divisions (Hughes 1963;Mendez-Herrera et al 1993). Some cell loss (up to 40%) occurs during the earlier migration of primordial germ cells (PGCs) from the epiblast and subsequent incorporation into the germinal epithelium (Swift 1914;Meyer 1964;Gilbert 1979;Kuwana 1993).…”

Section: Analysis Of Germline Replication Number In Birdsmentioning

confidence: 99%

Male-Driven Evolution Among Eoaves? A Test of the Replicative Division Hypothesis in a Heterogametic Female (ZW) System

Kahn

Quinn

1999

J Mol Evol

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Because avian females are heterogametic, the reverse of mammals, avian sex chromosomes undergo significantly different patterns and numbers of DNA replications than do those in mammals. This makes the W (female-specific) and the Z chromosomes an excellent model system for the study of the replicative division hypothesis, which purports that DNA substitution rate is determined by the number of germline replications. The sex-specific chromosome in birds (the W) is predicted to change at the slowest rate of all avian chromosomes because it undergoes the fewest rounds of replication per unit of evolutionary time. Using published data on gametogenesis from a variety of sources, we estimated the ratio of male-to-female germline replications (c) in galliforms and anseriforms to be approximately 4.4. The value of c should predict the value of the ratio of male-to-female mutation rates (alpha(m)) if the replicative division hypothesis is true. Homologous DNA sequences including an intron and parts of two exons of the CHD gene were obtained from the W and the Z chromosomes in ostrich, sage grouse, canvasback duck, tundra swan, and snow goose. The exons show significantly different nucleotide composition from the introns, and the W-linked exons show evidence of relaxed constraint. The Z-linked intron is diverging approximately 3.1 times faster than the W-linked intron. From this, alpha(m) was calculated to be approximately 4.1, with a confidence interval of 3.1 to 5.1. The data support the idea that the number of replicative divisions is a major determinant of substitution rate in the Eoavian genome.

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Section: Analysis Of Germline Replication Number In Birdsmentioning

confidence: 99%

Male-Driven Evolution Among Eoaves? A Test of the Replicative Division Hypothesis in a Heterogametic Female (ZW) System

Kahn

Quinn

1999

J Mol Evol

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“…Concomitant with this proliferation the primary sex cords of the medulla begin to fragment. In contrast, chicken germ cell proliferation and initiation of medulla regression occurs around 7-10 days of incubation (Hughes, 1963;Narbaitz and Adler, 1966; and germ cell counts peak at day 17 (Mendez-Herrera et al, 1993).…”

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confidence: 99%

Developmental morphology of the neonatal alligator (Alligator mississippiensis) ovary

Moore

Uribe-Aranzábal

Boggs

et al. 2007

Journal of Morphology

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American alligator (Alligator mississippiensis) ovary development is incomplete at hatching. During the months following hatching, the cortical processes of oogenesis started in ovo continues and folliculogenesis is initiated. Additionally, the medullary region of the gonad undergoes dramatic restructuring. We describe alligator ovarian histology at hatching, 1 week, 1 month, and 3 months of age in order to characterize the timing of morphological development and compare these findings to chicken ovary development. At hatching, the ovarian cortex presents a germinal epithelium containing oogonia and a few primary oocytes irregularly scattered between somatic epithelial cells. The hatchling medulla shows fragmentation indicative of the formation of lacunae. By 1 week of age, oocytes form growing nests and show increased interactions with somatic cells, indicative of the initiation of folliculogenesis. Medullary lacunae increase in diameter and contain secretory material in their lumen. At 1 month, nest sizes and lacunar diameters continue to enlarge. Pachytene oocytes surrounded by somatic cells are more frequent. Trabeculae composed of dense irregular connective tissue divide cortical nests. Three months after hatching oocytes in meiotic stages of prophase I up to diplotene are present. The ovary displays many enlarged follicles with oocytes in diplotene arrest, thecal layers, lampbrush chromosomes, and complete layers of follicular cells. The medulla is an elaborated complex of vascularized lacunae underlying the cortex and often containing discrete lymphoid aggregates. While the general morphology of the alligator ovary is similar to that of the chicken ovary, the progression of oogenesis and folliculogenesis around hatching is notably slower in alligators. Diplotene oocytes are observed at hatching in chickens, but not until 3 months in alligators. Folliculogenesis is completed at 3 weeks in chickens whereas it is still progressing at 3 months in alligators.

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“…The presence of NE cells in the immature fowl ovary raises interesting questions regarding their function and embryonic origin. It is tempting to hypothesize that their secretory products might regulate early ovarian histogenesis directly, as has been shown for the development of the respiratory tract (Cutz, 1982;Pan et al 2004Pan et al , 2006Evsyukova, 2006), or indirectly, by modifying ovarian steroid secretion (Mé ndez-Herrera et al 1993). In relation to their possible origin, all NE cells were originally considered to be derivatives of the neural crest, although it is now known that NE cells of different organ systems are not specified in the same germ layers of the embryo.…”

Section: Discussionmentioning

confidence: 99%

“…, ; Evsyukova, ), or indirectly, by modifying ovarian steroid secretion (Méndez‐Herrera et al. ). In relation to their possible origin, all NE cells were originally considered to be derivatives of the neural crest, although it is now known that NE cells of different organ systems are not specified in the same germ layers of the embryo.…”

Section: Discussionmentioning

confidence: 99%

Neuroendocrine cells are present in the domestic fowl ovary

et al. 2012

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Neuroendocrine cells are present in virtually all organs of the vertebrate body; however, it is yet uncertain whether they exist in the ovaries. Previous reports of ovarian neurons and neuron-like cells in mammals and birds might have resulted from misidentification. The aim of the present work was to determine the identity of neuron-like cells in immature ovaries of the domestic fowl. Cells immunoreactive to neurofilaments, synaptophysin, and chromogranin-A, with small, dense-core secretory granules, were consistently observed throughout the sub-cortical ovarian medulla and cortical interfollicular stroma. These cells also displayed immunoreactivity for tyrosine, tryptophan and dopamine b-hydroxylases, as well as to aromatic L-DOPA decarboxylase, implying their ability to synthesize both catecholamines and indolamines. Our results support the argument that the ovarian cells previously reported as neuron-like in birds, are neuroendocrine cells.

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Effect of 17β-Estradiol on Somatic and Germ Cell Subpopulations in the Ovary of the Newly Hatched Chick

Cited by 6 publications

References 0 publications

Male-Driven Evolution Among Eoaves? A Test of the Replicative Division Hypothesis in a Heterogametic Female (ZW) System

Male-Driven Evolution Among Eoaves? A Test of the Replicative Division Hypothesis in a Heterogametic Female (ZW) System

Developmental morphology of the neonatal alligator (Alligator mississippiensis) ovary

Neuroendocrine cells are present in the domestic fowl ovary

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