Definitions for vitellogenesisvɪˌtɛl oʊˈdʒɛn ə sɪs, vaɪ-
This page provides all possible meanings and translations of the word vitellogenesis
Random House Webster's College Dictionary
vi•tel•lo•gen•e•sisvɪˌtɛl oʊˈdʒɛn ə sɪs, vaɪ-(n.)
the process by which a yolk is formed and accumulated in the ovum.
Category: Developmental Biology
Origin of vitellogenesis:
1945–50; vitell (us ) + -o - + -genesis
Vitellogenesis is the process of yolk formation via nutrients being deposited in the oocyte, or female germ cell involved in reproduction. In insects, it starts when the fat body stimulates the release of juvenile hormones and produces vitellogenin protein. It occurs in all animal groups other than the mammals. In cockroaches, for example, vitellogenesis can be stimulated by injection of juvenile hormone into immature females and mature males.Chemically yolk is lipoprotein composed of proteins,phospholipids and neutral fats along with a small amount of glycogen.The yolk is synthesised in the liver of the female parent in soluble form.Through circulation it is transported to the follicle cells that surrounds the maturing ovum,and is deposited in the form of yolk platelets and granules in the ooplasm.The mitochondria n golgi complex are said to bring in the conversion of he soluble form of yolk into insoluble granules or platelets. In mosquitoes infected with Plasmodium, vitellogenesis may be manipulated by the parasites to reduce fecundity.
U.S. National Library of Medicine
The active production and accumulation of VITELLINS (egg yolk proteins) in the non-mammalian OOCYTES from circulating precursors, VITELLOGENINS. Vitellogenesis usually begins after the first MEIOSIS and is regulated by estrogenic hormones.
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