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Oogenesis

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https://www.readbyqxmd.com/read/29784930/comparative-mrna-and-mirna-expression-in-european-mouflon-ovis-musimon-and-sheep-ovis-aries-provides-novel-insights-into-the-genetic-mechanisms-for-female-reproductive-success
#1
Ji Yang, Xin Li, Yin-Hong Cao, Kisun Pokharel, Xiao-Ju Hu, Ze-Hui Chen, Song-Song Xu, Jaana Peippo, Mervi Honkatukia, Juha Kantanen, Meng-Hua Li
Prolific breeds of domestic sheep (Ovis aries) are important genetic resources due to their reproductive performance, which is characterized by multiple lambs per birth and out-of-season breeding. However, the lack of a comprehensive understanding of the genetic mechanisms underlying the important reproductive traits, particularly from the evolutionary genomics perspective, has impeded the efficient advancement of sheep breeding. Here, for the first time, by performing RNA-sequencing we built a de novo transcriptome assembly of ovarian and endometrial tissues in European mouflon (Ovis musimon) and performed an mRNA-miRNA integrated expression profiling analysis of the wild species and a highly prolific domestic sheep breed, the Finnsheep...
May 21, 2018: Heredity
https://www.readbyqxmd.com/read/29784542/the-ovary-organization-in-the-marine-limnodriloidin-thalassodrilides-cf-briani-annelida-clitellata-naididae-resembles-the-ovary-of-freshwater-tubificins
#2
Anna Z Urbisz, Łukasz Chajec, Mana Ito, Katsutoshi Ito
In Thalassodrilides cf. briani, the paired ovaries are inconspicuous and polarized structures with developmental gradient of germ cells along their long axis. The about 300 germ cells in the ovary are consolidated into one syncytial cyst and each cell is connected to a common and branched mass of cytoplasm via one stable cytoplasmic bridge. The germ cells differentiate their fate into nurse cells and oocytes. Only one oocyte grows in a given time; it gathers cell organelles and yolk and then it detaches from the gonad...
May 12, 2018: Zoology: Analysis of Complex Systems, ZACS
https://www.readbyqxmd.com/read/29784067/yeast-derivatives-and-wheat-germ-in-the-adult-diet-modulates-fecundity-in-a-tephritid-pest
#3
L Goane, P M Pereyra, F Castro, M J Ruiz, M L Juárez, D F Segura, M T Vera
Anastrepha fraterculus (Wiedemann), a pest of great economic importance in South America, needs urgently to be controlled by environmentally friendly methods such as the sterile insect technique for which mass rearing of insects is required. Because oogenesis takes place during the adult stage, mass-rearing facilities should provide the females a diet that maximizes egg production at the lowest cost. Accordingly, we investigated the effect of artificial protein sources in the adult diet (yeast derivatives of different cost but with similar amino acids profiles, and the addition of wheat germ) on fecundity...
May 22, 2018: Bulletin of Entomological Research
https://www.readbyqxmd.com/read/29779102/insulator-protein-su-hw-is-indispensable-for-amplification-of-part-of-drosophila-amplicons-in-follicular-cells-dafcs-during-early-oogenesis
#4
A N Krasnov, N E Vorobyova, M Yu Mazina
We found that the Su(Hw) insulator protein binds to all known Drosophila amplicons in follicular cells (DAFCs). Su(Hw) binding is required for ORC replication complex positioning on part of DAFCs during early oogenesis. Our data allow us to expand the current view on the role of the Su(Hw) protein in Drosophila oogenesis as a transcription repressor. We assume that Su(Hw) is involved in the coordination of transcription and replication processes during oogenesis in Drosophila.
March 2018: Doklady. Biochemistry and Biophysics
https://www.readbyqxmd.com/read/29775928/tributyltin-impaired-reproductive-success-in-female-zebrafish-through-disrupting-oogenesis-reproductive-behaviors-and-serotonin-synthesis
#5
Wei-Yang Xiao, Ying-Wen Li, Qi-Liang Chen, Zhi-Hao Liu
Tributyltin (TBT), an organotin acting as aromatase (Cyp19a1) inhibitor, has been found to disrupt gametogenesis and reproductive behaviors in several fish species. However, few studies addressing the mechanisms underlying the impaired gametogenesis and reproduction have been reported. In this study, female adults of zebrafish (Danio rerio) were continuously exposed to two nominal concentrations of TBT (100 and 500 ng/L, actual concentrations: 90.8 ± 1.3 ng/L and 470.3 ± 2.7 ng/L, respectively) for 28 days...
May 12, 2018: Aquatic Toxicology
https://www.readbyqxmd.com/read/29770509/molecular-characteristics-of-granulosa-and-cumulus-cells-and-oocyte-competence-in-nelore-cows-with-low-and-high-numbers-of-antral-follicles
#6
C O Rosa, Lsr Marinho, Pra da Rosa, M P De Cesaro, P A Lunardelli, K C Silva-Santos, A C Basso, V Bordignon, M M Seneda
The aims of this study were to investigate whether the number of antral follicles (AF) in the ovaries of Nelore cows is influenced with the developmental competence of oocytes to reach the blastocyst stage and to quantify the mRNA abundance of genes associated with folliculogenesis and oogenesis in granulosa and cumulus cells. A total of 168 cows were distributed into two experimental groups according to the number of AF, low (≤31) and high AF (≥92), which were determined based on the mean number of AF (61...
May 16, 2018: Reproduction in Domestic Animals, Zuchthygiene
https://www.readbyqxmd.com/read/29768406/silencing-of-rpatg6-impaired-the-yolk-accumulation-and-the-biogenesis-of-the-yolk-organelles-in-the-insect-vector-r-prolixus
#7
Priscila H Vieira, Larissa Bomfim, Georgia C Atella, Hatisaburo Masuda, Isabela Ramos
In oviparous animals, the egg yolk is synthesized by the mother in a major metabolic challenge, where the different yolk components are secreted to the hemolymph and delivered to the oocytes mostly by endocytosis. The yolk macromolecules are then stored in a wide range of endocytic-originated vesicles which are collectively referred to as yolk organelles and occupy most of the mature oocytes cytoplasm. After fertilization, the contents of these organelles are degraded in a regulated manner to supply the embryo cells with fundamental molecules for de novo synthesis...
May 16, 2018: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/29768248/bisphenol-a-decreases-the-spontaneous-contractions-of-rat-uterus-in-vitro-through-a-nitrergic-mechanism
#8
Hemlata Gupta, Shripad B Deshpande
BACKGROUND: Bisphenol A (BPA), a chemical used in the manufacture of plastics, has toxic effects on various systems of the human body including the reproductive system. BPA possesses estrogenic activity and is implicated in altering oogenesis, ovulation, and fertility. In addition to ovulatory changes, uterine contractility is an important factor for fertility. However, the effects of BPA on myometrial contractions are not known. Therefore, we examined the effect of BPA on rat uterine contractions...
May 16, 2018: Journal of Basic and Clinical Physiology and Pharmacology
https://www.readbyqxmd.com/read/29758296/isolation-of-the-sex-determining-gene-sex-lethal-sxl-in-penaeus-litopenaeus-vannamei-boone-1931-and-characterization-of-its-embryogenic-gametogenic-and-tissue-specific-expression
#9
Itzia López-Cuadros, Alejandra García-Gasca, Gracia Gomez-Anduro, Cristina Escobedo-Fregoso, Raúl A Llera-Herrera, Ana M Ibarra
The Pacific white shrimp Penaeus vannamei is the most cultured shrimp species around the world. Because females grow larger than males, the culture of 'only females' is of great interest, but knowledge on sex determination and differentiation is required for producing only females. In an effort to obtain information associated with reproduction in P. vannamei, transcriptomic data from female gonads was generated, and partial sequences of a transcript were identified as Sex-lethal (Sxl). Its characterization indicated that, differently from other penaeids in which this gene has been isolated, there are six isoforms of the Sxl transcript in P...
May 11, 2018: Gene
https://www.readbyqxmd.com/read/29755732/recent-advances-in-understanding-oogenesis-interactions-with-the-cytoskeleton-microtubule-organization-and-meiotic-spindle-assembly-in-oocytes
#10
REVIEW
Florence L Marlow
Maternal control of development begins with production of the oocyte during oogenesis. All of the factors necessary to complete oocyte maturation, meiosis, fertilization, and early development are produced in the transcriptionally active early oocyte. Active transcription of the maternal genome is a mechanism to ensure that the oocyte and development of the early embryo begin with all of the factors needed for successful embryonic development. To achieve the maximum maternal store, only one functional cell is produced from the meiotic divisions that produce the oocyte...
2018: F1000Research
https://www.readbyqxmd.com/read/29753016/the-misshapen-kinase-regulates-the-size-and-stability-of-the-germline-ring-canals-in-the-drosophila-egg-chamber
#11
Ashley Kline, Travis Curry, Lindsay Lewellyn
Intercellular bridges are conserved structures that allow neighboring cells to exchange cytoplasmic material; defects in intercellular bridges can lead to infertility in many organisms. Here, we use the Drosophila egg chamber to study the mechanisms that regulate intercellular bridges. Within the developing egg chamber, the germ cells (15 nurse cells and 1 oocyte) are connected to each other through intercellular bridges called ring canals, which expand over the course of oogenesis to support the transfer of materials from the nurse cells to the oocyte...
May 9, 2018: Developmental Biology
https://www.readbyqxmd.com/read/29740006/identification-of-target-genes-regulated-by-the-drosophila-histone-methyltransferase-eggless-reveals-a-role-of-decapentaplegic-in-apoptotic-signaling
#12
Igojo Kang, Yourim Choi, Sueun Jung, Jae Yun Lim, Dooyoung Lee, Sumeet Gupta, Woongjoon Moon, Chanseok Shin
Epigenetic gene regulation is essential for developmental processes. Eggless (Egg), the Drosophila orthologue of the mammalian histone methyltransferase, SETDB1, is known to be involved in the survival and differentiation of germline stem cells and piRNA cluster transcription during Drosophila oogenesis; however the detailed mechanisms remain to be determined. Here, using high-throughput RNA sequencing, we investigated target genes regulated by Egg in an unbiased manner. We show that Egg plays diverse roles in particular piRNA pathway gene expression, some long non-coding RNA expression, apoptosis-related gene regulation, and Decapentaplegic (Dpp) signaling during Drosophila oogenesis...
May 8, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29731491/oocyte-specific-gene-oog1-suppresses-the-expression-of-spermatogenesis-specific-genes-in-oocytes
#13
Shinnosuke Honda, Yuka Miki, Yuya Miyamoto, Yu Kawahara, Satoshi Tsukamoto, Hiroshi Imai, Naojiro Minami
Oog1, an oocyte-specific gene that encodes a protein of 425 amino acids, is present in five copies on mouse chromosomes 4 and 12. In mouse oocytes, Oog1 mRNA expression begins at embryonic day 15.5 and almost disappears by the late two-cell stage. Meanwhile, OOG1 protein is detectable in oocytes in ovarian cysts and disappears by the four-cell stage; the protein is transported to the nucleus in late one-cell to early two-cell stage embryos. In this study, we examined the role of Oog1 during oogenesis in mice...
May 3, 2018: Journal of Reproduction and Development
https://www.readbyqxmd.com/read/29729387/characterisation-of-anopheles-gambiae-heme-oxygenase-and-metalloporphyrin-feeding-suggests-a-potential-role-in-reproduction
#14
Christopher S Spencer, Cristina Yunta, Glauber Pacelli Gomes de Lima, Kay Hemmings, Lu-Yun Lian, Gareth Lycett, Mark J I Paine
The mosquito Anopheles gambiae is the principal vector for malaria in sub-Saharan Africa. The ability of A. gambiae to transmit malaria is strictly related to blood feeding and digestion, which releases nutrients for oogenesis, as well as substantial amounts of highly toxic free heme. Heme degradation by heme oxygenase (HO) is a common protective mechanism, and a gene for HO exists in the An. gambiae genome HO (AgHO), although it has yet to be functionally examined. Here, we have cloned and expressed An. gambiae HO (AgHO) in E...
May 2, 2018: Insect Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/29729259/insulin-signaling-acts-in-adult-adipocytes-via-gsk-3%C3%AE-and-independently-of-foxo-to-control-drosophila-female-germline-stem-cell-numbers
#15
Alissa R Armstrong, Daniela Drummond-Barbosa
Tissue-specific stem cells are tied to the nutritional and physiological environment of adult organisms. Adipocytes have key endocrine and nutrient-sensing roles and have emerged as major players in relaying dietary information to regulate other organs. For example, previous studies in Drosophila melanogaster revealed that amino acid sensing as well as diet-dependent metabolic pathways function in adipocytes to influence the maintenance of female germline stem cells (GSCs). How nutrient-sensing pathways acting within adipocytes influence adult stem cell lineages, however, is just beginning to be elucidated...
May 2, 2018: Developmental Biology
https://www.readbyqxmd.com/read/29728057/transcriptome-profiling-of-the-honeybee-parasite-varroa-destructor-provides-new-biological-insights-into-the-mite-adult-life-cycle
#16
Fanny Mondet, Andrea Rau, Christophe Klopp, Marine Rohmer, Dany Severac, Yves Le Conte, Cedric Alaux
BACKGROUND: The parasite Varroa destructor represents a significant threat to honeybee colonies. Indeed, development of Varroa infestation within colonies, if left untreated, often leads to the death of the colony. Although its impact on bees has been extensively studied, less is known about its biology and the functional processes governing its adult life cycle and adaptation to its host. We therefore developed a full life cycle transcriptomic catalogue in adult Varroa females and included pairwise comparisons with males, artificially-reared and non-reproducing females (10 life cycle stages and conditions in total)...
May 4, 2018: BMC Genomics
https://www.readbyqxmd.com/read/29717005/correction-wash-exhibits-context-dependent-phenotypes-and-along-with-the-wash-regulatory-complex-regulates-drosophila-oogenesis-doi-10-1242-211573
#17
Jeffrey M Verboon, Jacob R Decker, Mitsutoshi Nakamura, Susan M Parkhurst
No abstract text is available yet for this article.
May 1, 2018: Journal of Cell Science
https://www.readbyqxmd.com/read/29708548/using-mouse-oocytes-to-assess-human-gene-function-during-meiosis-i
#18
Diego Marin, Alexandra L Nguyen, Richard T Scott, Karen Schindler
Embryonic aneuploidy is the major genetic cause of infertility in humans. Most of these events originate during female meiosis, and albeit positively correlated with maternal age, age alone is not always predictive of the risk of generating an aneuploid embryo. Therefore, gene variants might account for incorrect chromosome segregation during oogenesis. Given that access to human oocytes is limited for research purposes, a series of assays were developed to study human gene function during meiosis I using mouse oocytes...
April 10, 2018: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29702662/fenoxycarb-exposure-disrupted-the-reproductive-success-of-the-amphipod-gammarus-fossarum-with-limited-effects-on-the-lipid-profile
#19
Hélène Arambourou, Inmaculada Fuertes, Emmanuelle Vulliet, Gaëlle Daniele, Patrice Noury, Nicolas Delorme, Khedidja Abbaci, Carlos Barata
Insect growth regulator insecticides mimic the action of hormones on the growth and development of insect pests. However, they can affect the development of non-target arthropods. In the present study, we tested the effects of the growth regulator insecticide fenoxycarb on several endpoints in the freshwater crustacean Gammarus fossarum (Amphipoda). Females carrying embryos in their open brood pouch were exposed to 50 μg L-1 fenoxycarb throughout the entire oogenesis (i.e. 21 days). After exposure, newborn individuals from exposed embryos were removed from the maternal open brood pouch for lipidomic analysis, while males were added to assess the reproductive success...
2018: PloS One
https://www.readbyqxmd.com/read/29701280/enhancing-nanos-expression-via-the-bacterial-tomo-protein-is-a-conserved-strategy-used-by-the-symbiont-wolbachia-to-fuel-germ-stem-cell-maintenance-in-infected-drosophila-females
#20
Manabu Ote, Daisuke Yamamoto
The toxic manipulator of oogenesis (TomO) protein has been identified in the wMel strain of Wolbachia that symbioses with the vinegar fly Drosophila melanogaster, as a protein that affects host reproduction. TomO protects germ stem cells (GSCs) from degeneration, which otherwise occurs in ovaries of host females that are mutant for the gene Sex-lethal (Sxl). We isolated the TomO homologs from wPip, a Wolbachia strain from the mosquito Culex quinquefasciatus. One of the homologs, TomOw Pip 1, exerted the GSC rescue activity in fly Sxl mutants when lacking its hydrophobic stretches...
April 27, 2018: Archives of Insect Biochemistry and Physiology
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