Oogenesis in Teleost Fish

Kagawa, Hirohiko

doi:10.5047/absm.2013.00604.0099

Cited by 68 publications

(59 citation statements)

References 87 publications

(129 reference statements)

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“…The rapid proliferation of germ cells was earlier observed than the formation of the ovarian cavity and meiosis of germ cells in P. olivaceus . Similar results were also reported in Oryzias latipes (Kagawa, ), Cyprinus carpio (Mazzoni et al, ), and Lepomis macrochirus (Gao et al, ). As mitosis proceeded, oogonia inside the cysts formed a cluster of interconnected cells known as cell nests.…”

Section: Discussionsupporting

confidence: 84%

Germ Cell Migration, Proliferation and Differentiation during Gonadal Morphogenesis in All‐Female Japanese Flounder (Paralichthys Olivaceus)

Yang

Liu

Xiao

et al. 2018

The Anatomical Record

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In this study, all genetic female (XX) broods of Japanese flounder were produced artificially by mating the females with sex-reversed males. The proliferation and migration of primordial germ cells (PGCs), formation of ovary and oogenesis were described in detail. After hatching, around 20 individual PGCs migrated from the lateral to the dorsal of trunk region. At 15 days posthatching (dph), a part of PGCs were covered by a single layer somatic cells and formed the genital ridge. By 22 dph, the elongated gonadal primordia appeared under the ventral kidney, where the PGCs were totally enclosed by somatic cells. During the process of migration, PGCs were presumed to be mitotically inactive. From 63 to 73 dph, somatic cells rearrangement resulted in the formation of a narrow crevice, which became deeper and formed ovarian lumen. However, at 52 dph, dramatic mitotic proliferation of germ cell occurred and germline nest formed before the appearance of ovarian lumen. The onset of intensive germ cell proliferation and appearance of cell nests could be accepted as a criterion of initial ovarian differentiation. Then germ cells and somatic epithelial cells were gradually delimited by basement membrane and formed the germinal epithelium. In this period, results from in situ hybridization revealed that the early forkhead box L2 (pofoxl2) was expressed in somatic cells and oocytes in primary growth, which indicated the prefollicle cells formed. Then oogonia or oocytes, follicle cells, basement membrane, and theca cells composed a follicle complex. Finally, oocytes underwent meiosis and developed into to mature eggs. Anat Rec, 301:727-741, 2018. © 2017 Wiley Periodicals, Inc.

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Section: Discussionsupporting

confidence: 84%

Germ Cell Migration, Proliferation and Differentiation during Gonadal Morphogenesis in All‐Female Japanese Flounder (Paralichthys Olivaceus)

Yang

Liu

Xiao

et al. 2018

The Anatomical Record

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“…In all oviparous vertebrates, including Xenopus and zebrafish, oogonial proliferation and oocyte recruitment occur throughout the reproductive cycle, and ovarian follicles undergo the same basic pattern of growth followed by final oocyte maturation and ovulation (Kagawa, ; Tyler & Sumpter, ; Wallace, ). The secondary growth phase is characterized by oocyte growth due to the synthesis and incorporation of yolk material into the growing oocyte (Figure b) (Wallace, ).…”

Section: Insulin Regulation Of Oogenesis and Ovarian Developmentmentioning

confidence: 99%

Conserved insulin signaling in the regulation of oocyte growth, development, and maturation

2017

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Insulin signaling regulates various aspects of physiology, such as glucose homeostasis and aging, and is a key determinant of female reproduction in metazoans. That insulin signaling is crucial for female reproductive health is clear from clinical data linking hyperinsulinemic and hypoinsulinemic condition with certain types of ovarian dysfunction, such as altered steroidogenesis, polycystic ovary syndrome, and infertility. Thus, understanding the signaling mechanisms that underlie the control of insulin-mediated ovarian development is important for the accurate diagnosis of and intervention for female infertility. Studies of invertebrate and vertebrate model systems have revealed the molecular determinants that transduce insulin signaling as well as which biological processes are regulated by the insulin-signaling pathway. The molecular determinants of the insulin-signaling pathway, from the insulin receptor to its downstream signaling components, are structurally and functionally conserved across evolution, from worms to mammals – yet, physiological differences in signaling still exist. Insulin signaling acts cooperatively with gonadotropins in mammals and lower vertebrates to mediate various aspects of ovarian development, mainly owing to evolution of the endocrine system in vertebrates. In contrast, insulin signaling in Drosophila and Caenorhabditis elegans directly regulates oocyte growth and maturation. In this review, we compare and contrast insulin-mediated regulation of ovarian functions in mammals, lower vertebrates, C. elegans, and Drosophila, and highlight conserved signaling pathways and regulatory mechanisms in general while illustrating insulin’s unique role in specific reproductive processes.

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“…N, nucleus. (Nagahama et al, 1994;Yoshizaki et al, 2001;Patino et al, 2003;Kagawa, 2013;Lubzens et al, 2010).…”

Section: 결 과mentioning

confidence: 99%

“…(Verasper variegates) (Chasmichthys dolichognathus) (Baek, 2001(Baek, , 2008 T E 2 T E 2 aromatase (Kagawa, 2013). (Pagrus major)…”

Section: 결 과mentioning

confidence: 99%

See 1 more Smart Citation

Steroid Metabolism in the Blackfin Flounder Glyptocephalus stelleri during Oocyte Maturation

Lee¹,

Baek²

2015

Korean Journal of Fisheries and Aquatic Sciences

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Oogenesis in Teleost Fish

Cited by 68 publications

References 87 publications

Germ Cell Migration, Proliferation and Differentiation during Gonadal Morphogenesis in All‐Female Japanese Flounder (Paralichthys Olivaceus)

Germ Cell Migration, Proliferation and Differentiation during Gonadal Morphogenesis in All‐Female Japanese Flounder (Paralichthys Olivaceus)

Conserved insulin signaling in the regulation of oocyte growth, development, and maturation

Steroid Metabolism in the Blackfin Flounder Glyptocephalus stelleri during Oocyte Maturation

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