Oocyte (or ovum/egg) activation is a series of processes that occur in the oocyte during fertilization.
Sperm entry causes calcium release into the oocyte. In mammals, this is caused by the introduction of phospholipase C isoform zeta (PLCζ) from the sperm cytoplasm.[1] Activation of the ovum includes the following events:
Cortical reaction to block against other sperm cells
Activation of egg metabolism
Reactivation of meiosis
DNA synthesis
^Saleh A, Kashir J, Thanassoulas A, Safieh-Garabedian B, Lai FA, Nomikos M (2020). "Essential Role of Sperm-Specific PLC-Zeta in Egg Activation and Male Factor Infertility: An Update". Front. Cell Dev. Biol. 8 (28). doi:10.3389/fcell.2020.00028. PMC 7000359.
Oocyte (or ovum/egg) activation is a series of processes that occur in the oocyte during fertilization. Sperm entry causes calcium release into the oocyte...
An oocyte (UK: /ˈoʊəsaɪt/, US: /ˈoʊoʊ-/), oöcyte, or ovocyte is a female gametocyte or germ cell involved in reproduction. In other words, it is an immature...
KIT in the oocyte, leading to the activation of PI3K/Akt pathway, allowing oocyte survival and development. During embryogenesis, oocytes initiate meiosis...
has been found that treating globozoospermia with ICSI along with oocyteactivation by calcium ionophore (an ion carrier used to increase intracellular...
[citation needed] Another molecule that has been implicated in the activation of oocyte follicles is Forkhead boxL2 (Foxl2). In knock out studies, it has...
contributes with DNA/chromatin, a centriole, and perhaps also an oocyte-activating factor (OAF). It may also contribute with paternal messenger RNA (mRNA)...
nuclear membrane is dissolved. Chemicals are also used to stimulate oocyteactivation. When applied the membrane is completely dissolved. Somatic Cell Nuclear...
that of ICSI, since additional stimuli are needed to ensure proper oocyteactivation after spermatid injection. If all requirements for round spermatid...
MII-arrested oocyte to proceed through meiosis. To initiate parthenogenesis of swine oocytes, various methods exist to induce an artificial activation that mimics...
Vitellogenesis is the process of yolk protein formation in the oocytes during sexual maturation. The term vitellogenesis comes from the Latin vitellus...
is the technique of letting the contents of ovarian follicles and the oocytes inside mature in vitro. It can be offered to women with infertility problems...
Rybouchkin, Petra De Sutter, C. Qian, M. Dhont have discovered that oocyteactivation during ICSI is triggered by a water-soluble, heat-sensitive, non species...
follicle, a densely packed shell of somatic cells that contains an immature oocyte. Folliculogenesis describes the progression of a number of small primordial...
secretory organelles (ranging from 0.2 um to 0.6 um in diameter) found within oocytes and are most associated with polyspermy prevention after the event of fertilization...
to begin the menstrual cycle again. After ovulation and release of the oocyte, the anterior pituitary hormones–follicle-stimulating hormone (FSH) and...
Ionophore will replace absence of sperm acrosome, and plays role in oocyteactivation after ICSI. Recommended use is 0.5 microgram/ml twice for 10 min interrupted...
stimulated with progesterone. Because the entry of oocytes into meiosis is frequently referred to as oocyte maturation, this cytoplasmic factor was called...
concentrations. When the first spermatozoa get inside the oocyte, it brings in PLC-zeta, that is activated by oocyte's basal calcium concentrations, initiates the formation...
concentration gradient of a chemoattractant secreted from the oocyte and thereby reach the oocyte. Since the discovery of sperm attraction to the female gametes...
Resumption of meiosis occurs as a part of oocyte meiosis after meiotic arrest has occurred. In females, meiosis of an oocyte begins during embryogenesis and will...
during egg-laying. Before egg activation, the vitelline membrane is permeable to water, ions, and small molecules. Egg activation is stimulated by mechanical...
soluble sperm factor in spermatozoa that is responsible for the activation of oocytes. His studies span animals and humans, from the identification of...
activation, involving the acrosome reaction. Non-mammalian spermatozoa do not require this capacitation step and are ready to fertilize an oocyte immediately...
not translated during dictyate. Shortly before ovulation, the oocyte of interest activates these mRNA strains. Translation of mRNA in dictyate is partly...
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