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1,048 results for “oocyte;”
Fig. 1 in A new vision of the origin and the oocyte development in the ostariophysi applied to Gymnotus sylvius (Teleostei, Gymnotiformes)
Fig. 1. Folliculogenesis in Gymnotus sylvius. Light Microscopy. A: Scattered in the germinal epithelium, the quiescent oogonium (g) is wrapped by the epithelial cells (arrow). Ovarian lumen: ol; Primary growth oocyte: po. B: Oogonia (g) proliferate and are surrounded by cells derived from the epithelium, the prefollicle cells (pf). Epithelium: arrow; Ovarian lumen: ol; Primary growth oocyte: po. C: Proliferation of the oogonium give rise to cell clusters, the germ cell nests (n), upon the magenta, PAS-positive basement membrane (bm) which in cross section is seen surrounding the nest. Epithelium: arrow; Ovarian lumen: ol; Secondary growth oocyte: so. D, E: In the nests (n), with the beginning and progress of meiosis, the prophase oocytes differentiate. In leptotene (lo) and in pachytene (po), they can be distinguished by the pattern of chromatin condensation. Proliferating oogonia (g) and prophase oocytes co-occur in a same nest (n). Epithelium: arrow; Ovarian lumen: ol. F, G: Prefollicle cells increasingly surround the oocytes, separating them one from another. As basement membranes form around individual oocytes and the prefollicle cells surrounding them, they are separated from the cell cluster. Completely surrounded by and individualized by
Figure 9 in Position and development of oocytes in velvet worms shed light on the evolution of the ovary in Onychophora and Arthropoda
Figure 9. Development of the endogenous ovary in Epiperipatus biolleyi. Transmission electron micrographs. A, position of the ovarian anlage beneath the presumptive heart and attached to the pericardial floor (pe) in an embryo with a full number of somites. Cross-section of the dorsal body. B, cross-section of an ovarian tube. Note the distinct separation into a germinal epithelium (ge), which contains the primordial germ cells (pgc), and a sterile epithelium (se). C, detail of the sterile epithelium. D, detail of the germinal epithelium. Arrowheads indicate apical junctions. Abbreviations: bl, basal lamina; ec, ectoderm; ge, germinal ovarian epithelium; hc, haemocoel; hl, lumen of the presumptive heart; lu, lumen of the ovarian anlage; me, outer layer of mesodermal cells that will later form the ovarian musculature; nu, nucleus; pe, presumptive pericardial floor; pgc, primordial germ cells; se, sterile ovarian epithelium.
Figure 7 in Position and development of oocytes in velvet worms shed light on the evolution of the ovary in Onychophora and Arthropoda
Figure 7. Internal organization of the endogenous ovary in Epiperipatus biolleyi. Light micrograph (A) and transmission electron micrographs (B–F). A, cross-section of the ovary (dorsal is up). Note the central position of ovarian lumen (lu) surrounded by germinal epithelium (ge) and the lack of a sterile epithelium. B, maturating oocyte (oc) from the germinal epithelium lying within a spherical chamber (ch), which is formed by specific cells (ce) of the germinal epithelium. C, detail of epithelial cells and an oocyte. Arrowheads indicate apical junctions. D, detail of the basal portion of the germinal epithelium with surrounding connective tissue containing muscle cells (mc). E, lower magnification of connective tissue showing numerous tracheal tubes (arrows). F, peripheral region of connective tissue containing tracheal tubes (tr) and flattened cells with an electron-dense content (fc). Abbreviations: bl, basal lamina; ce, cells of germinal epithelium that form the oocyte chamber; ch, oocyte chamber; ct, connective tissue; fc, flattened cell; ge, germinal epithelium; hc, haemocoel; lu, ovarian lumen; mc, muscle cells; mv, microvilli; nl, nucleolus; nu, nucleus; oc, maturating oocytes; tr, tracheal tubes.
Figure 5 in Position and development of oocytes in velvet worms shed light on the evolution of the ovary in Onychophora and Arthropoda
Figure 5. Internal organization of the exogenous ovary in Opisthopatus roseus (A–C, E, F) and Peripatopsis balfouri (D). Transmission electron micrographs. A, detail of ovarian epithelia and lumen. Arrowheads indicate apical junctions connecting epithelial cells. B, mitotically dividing oogonium (og) from the germinal epithelium. C, maturating oocyte (oc) with associated cells (ce) of modified germinal epithelium. Arrows point to the basal lamina which is strongly folded. D, maturating oc in the process of breaking through the connective tissue and growing out into the haemocoel. E, detail of dorsal ovarian wall showing the sterile epithelium (se) and the connective tissue (ct), which contains the musculature (mc). F, higher magnification of connective tissue showing muscle cells and collagen fibres. Abbreviations: bl, basal lamina; ce, cells associated with an oocyte (sometimes referred to as 'follicle cells' in the literature); cg, collagen fibres; ct, connective tissue; ge, germinal epithelium; hc, haemocoel; he, haemocyte; lu, ovarian lumen; mc, muscle cell; mt, mitochondria; mv, microvilli; nl, nucleolus; nu, nucleus; oc, maturating oocyte; og, oogonium; se, sterile epithelium; st, growing stalk.
Figure 4 in Position and development of oocytes in velvet worms shed light on the evolution of the ovary in Onychophora and Arthropoda
Figure 4. Internal organization of the exogenous ovary in Opisthopatus roseus (A, B) and Peripatopsis balfouri (C). Transmission electron micrographs. A, cross-section through the middle of the ovary. Dorsal is up. Note the unpaired lumen (lu) and the separation of the ovarian epithelium into a dorsal sterile epithelium (se) and a ventral germinal epithelium (ge). B, stalked oocytes enclosed by a vitelline membrane (= primary egg membrane). C, detail of a stalk. Arrows indicate intermediate filaments, arrowheads point to hemidesmosomes. Inset shows continuity of the basal lamina covering a stalk and a maturating oocyte that bulges into the haemocoel of the female. Abbreviations: bl, basal lamina; ct, connective tissue; ge, germinal epithelium; hc, haemocoel; lu, ovarian lumen; nl, nucleolus; nu, nucleus; oc, maturating oocytes; se, sterile epithelium; st, stalk; vm, vitelline membrane.
Figure 6 in Position and development of oocytes in velvet worms shed light on the evolution of the ovary in Onychophora and Arthropoda
Figure 6. Internal organization of the pseudoendogenous ovary in Metaperipatus inae (A–E) and Metaperipatus blainvillei (F). Light micrographs (A, B) and transmission electron micrographs (C–F). A, cross-section of the ovary (dorsal is up). Note the lateral position of the crescent-shaped ovarian lumen (lu) and the central position of the germinal epithelium (ge). B, detail of stalked oocytes (oc) from the germinal epithelium, which do not bulge into the haemocoel but retain their position within the ovary. C, detail of cells (ce) surrounding a maturating oocytes in the germinal epithelium. D, detail of a stalk. Arrows indicate the intermediate filaments. E, detail of the lumen and ovarian epithelia. The epithelial cells are connected by an apical junction (arrowhead). F, lateral ovarian wall consisting of the sterile epithelium (se) and connective tissue containing muscle cells (mc), a haemocyte (he), and sperm (sh). Abbreviations: bl, basal lamina; ce, cells associated with an oocyte; cg, collagen fibres; ct, connective tissue; ge, germinal epithelium; hc, haemocoel; he, haemocyte; lu, ovarian lumen; mc, muscle cell; mv, microvilli; nl, nucleolus; nu, nucleus; oc, maturating oocyte; se, sterile epithelium; sh, sperm head; st, stalk; sw, sterile ovarian wall.
Figure 3 in Position and development of oocytes in velvet worms shed light on the evolution of the ovary in Onychophora and Arthropoda
Figure 3. Diagram of internal organization of the three major ovarian types in Onychophora: exogenous ovary (A, D), pseudoendogenous ovary (B, E), and endogenous ovary (C, F). A, cross-section of the exogenous ovary with separate ovarian tubes that occur, e.g. in Euperipatoides rowelli, Phallocephale tallagandensis, and Ooperipatellus insignis (Australian Peripatopsidae). B, cross-section of the pseudoendogenous ovary of Metaperipatus inae (Peripatopsidae, Chile). C, cross-section of the endogenous ovary of Epiperipatus biolleyi (Peripatidae, Costa Rica). Note the complete lack of a sterile epithelium. D, detail of the composition of the ovarian wall in Opisthopatus roseus (Peripatopsidae, South Africa). E, detail of the ovary in Met. inae. F, detail of the ovarian wall in Ep. biolleyi. Abbreviations: bl, basal lamina; ct, connective tissue; fc, flattened cell; ge, germinal epithelium; hc, haemocoel; lu, ovarian lumen; mc, muscle cell; oc, oocyte; se, sterile epithelium; st, stalk; tr, tracheae.
Figure 1 in Position and development of oocytes in velvet worms shed light on the evolution of the ovary in Onychophora and Arthropoda
Figure 1. Simplified diagrams of paired versus variously fused structure of the ovarian tubes in Onychophora. Tissues are represented in light grey, ovarian lumen in dark grey. A, exogenous ovary of Typhloperipatus williamsoni (South-East Asian Peripatidae). Modified and complemented according to descriptions given by Kemp (1914). B–D, exogenous ovaries in three species of Peripatopsidae. B, Euperipatoides rowelli (Australia). Note the completely separate ovarian tubes in the middle of the ovary and the fused ovarian lumens at the anterior and posterior ends. A similar ovarian organization has been described in Peripatoides novaezealandiae from New Zealand (Sheldon, 1890: fig. 26). C, Peripatopsis balfouri (South Africa, cf. Fig. 2A). Although the ovarian tubes are fused, their lumens are separate along their entire length. D, Opisthopatus roseus (South Africa). Note the unpaired ovarian structure with a single lumen. E, pseudoendogenous ovary of Metaperipatus inae (Peripatopsidae, Chile, cf. Fig. 2B) with fused ovarian tubes but separate lumens. F, endogenous ovary of Epiperipatus biolleyi (Neotropical Peripatidae, cf. Fig. 2C) with lumens communicating only at the posterior end. G, endogenous ovary of Mesoperipatus tholloni (Peripatidae, Tropical Africa), modified and complemented after Bouvier (1905). Each ovarian tube is completely separate in this species.
Figure 10 in Position and development of oocytes in velvet worms shed light on the evolution of the ovary in Onychophora and Arthropoda
Figure 10. Mapping of three major types of onychophoran ovaries on simplified trees representing three different hypotheses on the phylogenetic relationships of Onychophora. Onychophoran subgroups are designated by their geographical distribution. Note that the suggestion of the exogenous type as an ancestral feature of Onychophora is consistent with all three phylogenetic hypotheses. A, both Peripatopsidae and Peripatidae are monophyletic (phylogeny modified from Monge-Nájera, 1995: fig. 10). B, Peripatidae are nonmonophyletic (phylogeny simplified from Reid, 1996: fig. 29). C, Peripatopsidae are nonmonophyletic (phylogeny simplified from Reid, 1996: fig. 28).
Metabolome data of fresh and conditioned in vitro oocyte maturation media and blastocyst conditioned media
<p>This dataset includes metabolome profiles from fresh and conditioned in vitro maturation media and blastocyst conditioned media. Ultra-High-Performance Liquid Chromatography-High Resolution Mass Spectrometry was performed on media samples and Xcalibur (RAW) files were converted to an open source mzML format (msconvert software; ProteoWizard package). The converted files were processed using the Metabolomic Analysis and Visualization Engine (MAVEN; mzroll software, Princeton University) to complete an untargeted analysis of the liquid chromatography mass spectrometry data. The pre-processed peak data tables generated by MAVEN are provided in this dataset.</p>
Data from: SMAD4 promotes somatic-germline contact during murine oocyte growth
<p>Development of the mammalian oocyte requires physical contact with the surrounding granulosa cells of the follicle, which provide it with essential nutrients and regulatory signals. This contact is achieved through specialized filopodia, termed transzonal projections (TZPs), that extend from the granulosa cells to the oocyte surface. Transforming growth factor (TGFβ) family ligands produced by the oocyte increase the number of TZPs, but how they do so is unknown. Using an inducible Cre recombinase strategy together with expression of green fluorescent protein to verify Cre activity in individual granulosa cells, we examined the effect of depleting the canonical TGFβ mediator, SMAD4. We observed a 20-50% decrease in the total number of TZPs in SMAD4-depleted granulosa cell-oocyte complexes, and a 50% decrease in the number of newly generated TZPs when the granulosa cells were reaggregated with granulosa cell-free wild-type oocytes. Three-dimensional image analysis revealed that TZPs of SMAD4-depleted cells were also longer than controls and more frequently oriented towards the oocyte. Strikingly, the transmembrane proteins, N-cadherin and Notch2, were reduced by 50% in these cells. SMAD4 may thus modulate a network of cell adhesion proteins that stabilize the attachment of TZPs to the oocyte, thereby amplifying signalling between the two cell types.</p>
Fig. 1 in Oocyte development and ovarian maturation of the black triggerfish, Melichthys niger (Actinopterygii: Balistidae) in São Pedro e São Paulo Archipelago, Brazil
Fig. 1. Geographical location and map of the São Pedro e São Paulo Archipelago.
Data and Codes for "Long-Range Repulsion Between Chromosomes in Mammalian Oocyte Spindles"
<p>Complete source data and analysis codes for the paper "Long-Range Repulsion Between Chromosomes in Mammalian Oocyte Spindles" by Colm P Kelleher, Yash P Rana, and Daniel J Needleman</p> <p> </p> <p>Updates available at https://osf.io/p9t7z/</p>
TAIL-seq for Xenopus laevis oocytes and embryos in various conditions (internal ID: ms97)
<p>This dataset contains the raw sequencing data from a TAIL-seq run for Xenopus laevis embryos. The cluster intensities of fluorescence signals are repacked as an HDF5 formatted file, then split into multiple parts to fit in the dataset size limitation of the Zenodo.</p>
Association between decreased ovarian reserve and poor oocyte quality in young women.
<p>Young women may present with decreased ovarian reserve (DOR) and/or poor oocyte quality. These may lead to poor reproductive outcomes. Our retrospective study evaluated the association between oocyte quality and ovarian reserve in women aged between 18 and 35 years and undergoing controlled ovarian stimulation (COS) for in vitro fertilization. We defined DOR when anti-Müllerian hormone (AMH) levels were <1.2 ng/mL, basal follicle stimulating hormone (FSH) levels were ≥10 mIU/mL, or the antral follicle count (AFC) was <10 and analyzed the association between the number of mature or immature oocytes and the presence of alterations in oocyte morphology. We also evaluated the association between gonadotropin dose used in COS and oocyte quality. The study included 49 patients with a mean age of 31.0 ± 3.3 years; 348 oocyte images were evaluated. Patients with basal FSH levels of <10 mIU/mL had more mature oocytes than the group of patients with elevated FSH levels (6 vs. 2; p < 0.001). Patients with AMH<1.2 ng/mL had fewer mature oocytes and increased basal FSH levels (p < 0.001). Each unit increase in serum basal FSH levels represented a 42% increase in the likelihood of having an oocyte with cytoplasm abnormality (p = 0.006), while patients with AMH levels of <1.2 ng/mL had 5.3 times the risk of having an oocyte with cytoplasm abnormality [p = 0.004] and were 3 times more likely to have an abnormality in the perivitelline space (p = 0.018). When the AFC was <10, an increased risk of abnormally shaped oocytes was observed (p = 0.035). In summary, DOR was associated with poorer quality oocytes in women up to 35 years of age who underwent COS.</p>
Repository for "Light-induced cortical excitability reveals programmable shape dynamics in starfish oocytes"
<p>Data and code repository for paper "Light-induced cortical excitability reveals programmable shape dynamics in starfish oocytes". DOI tbd.</p>
Supplementary data to "Protocol to image, segment and quantify cortical contractions in maturing mouse oocytes"
<p>This dataset contains supplementary materials for the "Protocol to image, segment and quantify cortical contractions in maturing mouse oocytes" manuscript.</p> <p>This dataset contains two timelapse images of maturing oocytes (control_oocyte.tif and ArpC4_KO_oocyte.tif) with the corresponding Region of Interest files for FIJI (control_oocyte_UnetCortex.zip and ArpC4_KO_oocyte_UnetCortex.zip). The .csv files contain raw measurements produced by Radioak plugin for FIJI, and the .xlsx files contain the quantifications based on the raw data. The units in .csv and .xlsx files are microns.</p> <p> In the timelapse images the time resolution is 1 min, each pixel is 0.1135 micrometers.</p>
Figs. 80, 81. Parammobatodes rozeni, female. 80. Hind femur. 81 in Oocytes, Eggs, and Ovarioles of Some Long-Tongued Bees (Hymenoptera: Apoidea)
Figs. 80, 81. Parammobatodes rozeni, female. 80. Hind femur. 81. Tergal fasciae.
Fig. 35 in Oocytes, Eggs, and Ovarioles of Some Long-Tongued Bees (Hymenoptera: Apoidea)
Fig. 35. Diagram of mature oocyte of Oreopasites linsleyi, lateral view, anterior end facing left.
Fig. 3 in Parasitic Behavior of Exaerete smaragdina with Descriptions of Its Mature Oocyte and Larval Instars (Hymenoptera: Apidae: Euglossini)
Fig. 3. Exaerete smaragdina, mature oocyte, anterior end to the left. Scale = 1.0 mm.
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