Abstract:
:Drosophila melanogaster mature oocytes in ovaries are arrested at metaphase I of meiosis. Eggs that have reached the uterus have released this arrest. It was not known where in the female reproductive tract egg activation occurs and what triggers it. We investigated when and where the egg is activated in Drosophila in vivo and at what meiotic stage the egg is fertilized. We found that changes in the egg's envelope's permeability, one feature of activation, initiate during ovulation, even while most of the egg is still within the ovary. The egg becomes impermeable as it proceeds down the oviducts; the process is complete by the time the egg is in the uterus. Cross-linking of vitelline membrane protein sV23 also increases progressively as the egg moves through the oviducts and the uterus. Activation also triggers meiosis to resume before the egg reaches the uterus, such that the earliest eggs that reach the uterus are in anaphase I. We discuss models for Drosophila egg activation in vivo.
journal_name
Dev Bioljournal_title
Developmental biologyauthors
Heifetz Y,Yu J,Wolfner MFdoi
10.1006/dbio.2001.0246subject
Has Abstractpub_date
2001-06-15 00:00:00pages
416-24issue
2eissn
0012-1606issn
1095-564Xpii
S0012-1606(01)90246-5journal_volume
234pub_type
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