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Topic: Oogenesis

Related Topics

Spermatogenesis

Ovarian follicle

Ovum

Fallopian tube

Endometrium

Gastrula

Sperm

Ovary

Protostome

Embryogenesis

Drosophila melanogaster

Menopause

Glomerular filtration rate

Polycystic ovary syndrome

Ovarian cyst

	Oogenesis - Wikipedia, the free encyclopedia
		Oogenesis is the creation of an ovum (egg cell) in the ovarian follicle of the ovary.
		Oogenesis is not to be confused with oocytogenesis, which is the formation of oocytes, which are the female gametocytes that divide later into ova.
		In mammals, oogonial transformation into oocytes (oocytogenesis) is completed either before or shortly after birth.
	en.wikipedia.org /wiki/Oogenesis (154 words)

	Oogenesis, Gene Expression in Amphibians (Site not responding. Last check: 2007-10-20)
		One distinction of amphibian oogenesis is the formation of lampbrush chromosomes during the major phase of oocyte growth and differentiation.
		Meiosis I is suspended at the diplotene stage, and the homologs remain attached by chiasmata.
		Their massive synthesis during oogenesis is facilitated by amplification of the ribosomal RNA genes.
	www.acs.ucalgary.ca /~browder/oogen2.html (1424 words)

	Gametogenesis II.--OOGENESIS
		Oogenesis is the process of forming egg cells in the ovary.
		Oogonia arise from the germ cells that have migrated to the ovary.
		It is a kinase (P34 cdc2) which coupled with cyclin B acts to activate meiotic maturation through phosphorylation of proteins involved in nuclear membrane, spindle formation and chromosome condensation.
	www.msu.edu /~kopachik/zol320/website/notes/lec5.html (613 words)

	Oogenesis
		Oogenesis is the process of meiosis in female organisms from an oogonium to a primary oocyte, to a secondary oocyte, and then to an ovum.
		Although both are important processes, we will focus on mammalian oogenesis in this project, because it directly relates to the processes of germ-line gene therapy.
		Oogenesis begins soon after fertilization, as primordial germ cells travel from the yolk sac to the gonads, where they begin to proliferate mitotically.
	www.brown.edu /Courses/BI0032/gentherp/oogIC.html (478 words)

	Oogenesis: A collaborative effort (Site not responding. Last check: 2007-10-20)
		The task of oogenesis is to construct a large cell containing a large and complex dowry of resources for construction of the embryo before it can either make them on its own or obtain them from its environment.
		At the end of oogenesis, residual nurse cell cytoplasm is transferred into the oocyte.
		During mitochondrial replication in early oogenesis, mitochondria cluster around the nucleus to form a structure called the mitochondrial cloud.
	www.acs.ucalgary.ca /~browder/oogen.html (1108 words)

	Drosophila tissue and organ development: Oogenesis and the oocyte
		The distal poles of the meiosis II spindle would be retained from the meiosis I spindle and maintained by the same forces that originally formed them: the crosslinking activity and minus-end movement of Ncd along spindle microtubules (Endow, 1998).
		These findings reveal new similarities between oogenesis in Drosophila and vertebrates, and support the hypothesis that developing oocytes contain specific mechanisms to ensure that germ plasm is endowed with highly functional organelles (Cox, 2003).
		The presence of sperm in the reproductive tract may trigger changes in female fecundity by causing the release of female-derived activating substances or by releasing male-derived substances that have adhered to the sperm.
	www.sdbonline.org /fly/aimorph/oocyte2.htm (10732 words)

	Drosophila tissue and organ development: Oogenesis and the oocyte
		In the germarium, the anterior structure in which oogenesis is initiated, the germline cyst, is surrounded by a monolayer of somatic follicle cell precursors.
		As the encapsulated cyst exits from the germarium, approximately 10-14 of the somatic cells cease proliferation and differentiate.
		At stage 10 of oogenesis, the oocyte occupies the posterior half of the egg chamber, the nurse cells the anterior half, and the oocyte nucleus is positioned at the dorsal anterior corner of the oocyte.
	www.sdbonline.org /fly/aimorph/oocyte.htm (4959 words)

	Oogenesis (Site not responding. Last check: 2007-10-20)
		Oogenesis occurs by meiosis as well, but with some modifications.
		During mitosis and spermatogenesis, cytokinesis of the two daughter cells occurs right down the middle of the parent cell (symmetrical cytokinesis); but during oogenesis, cytokinesis occurs unevenly (asymmetrical cytokinesis).
		The primary oocyte is a very large cell containing many nutrients that will be important for the early mitotic divisions of the zygote (as it grows into an embryo).
	distance.stcc.edu /AandP/AP/AP2pages/reprod/oogenesi.htm (684 words)

	Meiosis - Wikipedia, the free encyclopedia
		Menstruated oocytes continue meiosis I and arrest at meiosis II until fertilization.
		The process of meiosis in females is called oogenesis.
		In males, meiosis occurs in precursor cells known as spermatogonia that divide twice to become sperm.
	en.wikipedia.org /wiki/Meiosis (2425 words)

	Identification of New X-Chromosomal Genes Required for Drosophila Oogenesis and Novel Roles for fs(1)Yb, brainiac and ...
		A germarium with the three different germarial regions (indicated) is shown and a vitellarium with stages 2-6, and a stage 10 egg chamber.
		Jackson, S.M. and Berg, C.A. Soma-to-germline interactions during Drosophila oogenesis are influenced by dose-sensitive interactions between cut and the genes cappuccino, ovarian tumor and agnostic.
		King, F. and Lin, H. Somatic signaling mediated by fs(1)Yb is essential for germline stem cell maintenance during Drosophila oogenesis.
	www.genome.org /cgi/content/full/11/1/67 (5222 words)

	Bio Question: Oogenesis (Site not responding. Last check: 2007-10-20)
		But if oogenesis is ONLY the process of formation, then it takes place only before birth.
		So the egg is only an ovum for like a couple of seconds, when the sperm fuses with it's membrane, and the two gamete's nuclei don't actually fuse until after the zygote is divided into 2 daughter cells.
		All the definitions of oogenesis that I found described it as the process of egg/ovum formation.
	talk.collegeconfidential.com /showthread.php?t=89802 (371 words)

	ARS \| Publication request: Oogenesis
		In addition, early stages of insect embryogenesis are very much dependent on regulatory factors stored in the egg during oogenesis, often requiring that these factors be specifically localized.
		Hence the relatively simple appearance of the egg masks a surprisingly complex structure that serves a number of different functions all essential for the development of the next generation.
		Here is presented a general description of ovary morphology and oogenesis in insects.
	www.ars.usda.gov /research/publications/publications.htm?SEQ_NO_115=135705 (163 words)

	Reproductive System / Female Reproductive System / Ovaries
		Female sex cells, or gametes, develop in the ovaries by a form of meiosis called oogenesis.
		The sequence of events in oogenesis is similar to the sequence in spermatogenesis, but the timing and final result are different.
		In oogenesis, only one functional fertilizable cell develops from a primary oocyte.
	training.seer.cancer.gov /module_anatomy/unit12_3_repdt_female1_ovaries.html (1003 words)

	Myosin Light Chain-activating Phosphorylation Sites Are Required for Oogenesis in Drosophila -- Jordan and Karess 139 ...
		The villin-like protein encoded by the Drosophila quail gene is required for actin bundle assembly during oogenesis.
		A role for the Drosophila segment polarity gene armadillo in cell adhesion and cytoskeletal integrity during oogenesis.
		Drosophila nonmuscle myosin II is required for rapid cytoplasmic transport during oogenesis and for axial nuclear migration in early embryos.
	www.jcb.org /cgi/content/full/139/7/1805 (9205 words)

	Oogenesis
		In some organisms, all stages of oogenesis can co-exist in the ovary (e.g.
		During mitochondrial replication in early oogenesis, mitochondria cluster around the nucleus to form a structure called the mitochondrial cloud (Fig.
		This material may be reproduced for educational purposes only provided credit is given to the original source.
	nte-serveur.univ-lyon1.fr /nte/embryon/browder/oogen.htm (927 words)

	Regulation of the Vitellogenin Receptor during Drosophila melanogaster Oogenesis -- Schonbaum et al. 11 (2): 511 -- ...
		Cummings, M.R., and King, R.C. The cytology of the vitellogenic stages of oogenesis in Drosophila melanogaster.
		Mahowald, A.P. Ultrastructural observations on oogenesis in Drosophila.
		Wallace, R.A., and Selman, K. Ultrastructural aspects of oogenesis and oocyte growth in fish and amphibians.
	www.molbiolcell.org /cgi/content/full/11/2/511 (6005 words)

	CiteULike: Tag oogenesis (Site not responding. Last check: 2007-10-20)
		Characterization of defects in adult germline development and oogenesis of sterile and rescued female hybrids in crosses between Drosophila simulans and Drosophila melanogaster.
		FIGalpha, a germ cell specific transcription factor involved in the coordinate expression of the zona pellucida genes.
		The Drosophila daughterless gene autoregulates and is controlled by both positive and negative cis regulation.
	www.citeulike.org /tag/oogenesis (341 words)

	Biliverdin during Xenopus laevis Oogenesis and Early Embryogenesis
		When the tetrapyrrole is inactivated by phototransforming it with ultraviolet light prior to the first division, the embryo fails to synthesize dorsal mRNAs, such as goosecoid or chordin, yet forms increased amounts of ventral transcripts, such as Vent 1, and, consequently, develops ventralized morphology.
		The two molecules form a complex that is secreted into and transported in the plasma to be taken up by the oocyte as it matures through its six stages of oogenesis.
		The results describe the pathway that generates, transports, and stores biliverdin as part of oogenesis, define the time course for its utilization after fertilization, and link biliverdin to the metabolism of the phosphoglycolipometalloprotein, vitellogenin.
	pubs.acs.org /cgi-bin/abstract.cgi/bichaw/2002/41/i31/abs/bi020204n.html (285 words)

	The Xenopus ELAV Protein ElrB Represses Vg1 mRNA Translation during Oogenesis -- Colegrove-Otero et al. 25 (20): 9028 ...
		IV of oogenesis, Vg1 mRNA is confined to the vegetal cortex
		Expression of ElrB during oogenesis correlates with the translational repression of Vg1 mRNA.
		III of oogenesis, when ElrB is present at its greatest concentration.
	mcb.asm.org /cgi/content/full/25/20/9028 (7486 words)

	Molecular Characterization of Putative Yolk Processing Enzymes and Their Expression During Oogenesis and Embryogenesis ...
		of oogenesis and in the embryo, when it is mobilized to facilitate
		in oocytes during oogenesis in the seabream [6].
		Schematic to show the relative levels of enzyme activities (derived from [4] for cathepsins and [12] for LPL) and gene expression (present study) of rainbow trout cathepsin B (CB), cathepsin D (CD), cathepsin L (CL), and LPL during oogenesis and embryogenesis.
	www.biolreprod.org /cgi/content/full/65/6/1701 (5950 words)

	Oogenesis in an Adult Prosimian
		IN most Eutherian mammals oogenesis, that is, mitotic proliferation of oogonia followed by the formation of oocytes in the arrested diplotene stage of meiosis, occurs only during embryonic life or the first weeks of postnatal life
		Electron microscopic preparations from the ovarian cortex of an adult Senegal galago (Galago senegalensis senegalensis) show that the germinal cords contain large round cells which have all the ultra-structural features of oogonia seen in mammalian embryos during the period of oogenesis.
		This scanty evidence was interpreted as indicating the occurrence of active oogenesis.
	www.nature.com /nature/journal/v226/n5245/abs/226552a0.html (344 words)

	Extracellular H+ dynamics during oogenesis in Rhodnius prolixus ovarioles -- Bjornsson and Huebner 207 (16): 2835 -- ...
		Extracellular H+ dynamics during oogenesis in Rhodnius prolixus ovarioles -- Bjornsson and Huebner 207 (16): 2835 -- Journal of Experimental Biology
		Oogenesis in insect ovarioles involves a progression of stages:
		Oocyte-follicle cell interaction during normal oogenesis and atresia in an insect.
	jeb.biologists.org /cgi/content/full/207/16/2835 (4647 words)

	Sequential Expression of Zona Pellucida Protein Genes during the Oogenesis of Domestic Cats -- Jewgenow and Fickel 60 ...
		Sequential Expression of Zona Pellucida Protein Genes during the Oogenesis of Domestic Cats -- Jewgenow and Fickel 60 (2): 522 -- Biology of Reproduction
		but is due to the disruption of normal ovarian oogenesis [29].
		Gene expression during mammalian oogenesis and early embryogenesis: quantification of three messenger RNAs abundant in fully grown mouse oocytes.
	www.biolreprod.org /cgi/content/full/60/2/522 (3554 words)

	Science Day 2005
		In the Drosophila ovary, programmed cell death can occur at three distinct stages: the start of oogenesis to ensure proper cell numbers, during mid-oogenesis to rid the ovary of abnormal eggs, and late in oogenesis to facilitate the development of the oocyte.
		To determine whether it affects death in oogenesis, we generated transgenic lines expressing dominant-negative forms of Dronc.
		To further study the role of caspases in oogenesis, flies overexpressing the caspase inhibitors were examined.
	www.bu.edu /phpbin/scienceday/judges/abstract.php?id=517 (387 words)

	Fertilization: Oogenesis (Site not responding. Last check: 2007-10-20)
		During oogenesis dramatic changes take place within the oocyte.
		These include changes in the size, yolk content and distribution, meiotic state of the oocyte, as well as progressive changes in the distribution of maternally supplied mRNAs and proteins that are required for development following fertilization.
		The morph sequence at the right illustrates the enormous changes in external appearance of the Xenopus oocyte as it progresses through oogenesis.
	worms.zoology.wisc.edu /frogs/fert/fert_oogen.html (76 words)

	UNSW Embryo- Week 1 3a Oogenesis
		PNAS Abstract In the mouse, has shown that in the ovary that it is the oocyte (egg) that regulates the development of the ovarian follicle (the surrounding cells).
		Search April 2006 "oogenesis" 2123 reference articles of which 272 were reviews.
		This page is an overview of the ovary and the development of egg (oogenesis) and the surrounding follicle.
	embryology.med.unsw.edu.au /Notes/week1_3a.htm (1482 words)

	{gamma}-Tubulin function during female germ-cell development and oogenesis in Drosophila -- Tavosanis and Gonzalez 100 ...
		oogenesis progression the simultaneous depletion of both protein
		ends of microtubules at stages 6-10 of oogenesis (27).
		oogenesis in female mutants for either of the two
	www.pnas.org /cgi/content/full/100/18/10263 (4028 words)

	Mouse staufen genes are expressed in germ cells during oogenesis and spermatogenesis -- Saunders et al. 6 (11): 983 -- ...
		Mouse staufen genes are expressed in germ cells during oogenesis and spermatogenesis -- Saunders et al.
		The stages of mouse oogenesis are shown at the top and diagramatically beneath.
		Karashima, T., Sugimoto, A. and Yamamoto, M. Caenorhabditis elegans homologue of the human azoospermia factor DAZ is required for oogenesis but not for spermatogenesis.
	molehr.oxfordjournals.org /cgi/content/full/6/11/983 (5126 words)

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