The micropyle: a sperm guidance system in teleost fertilization
نویسندگان
چکیده
منابع مشابه
The micropyle: a sperm guidance system in teleost fertilization.
The micropylar region of the Rosy barb, Barbus conchonius, egg consists of 7-10 grooves and ridges, which drain directly into a funnel-shaped vestibule, the only point on the chorion through which sperm-egg contact is achieved during fertilization. Results of time-lapse video microscope study and computer-aided analysis of sperm motility pattern in the micropylar region showed that the fertiliz...
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During fertilization in eukaryotes, gametes of the opposite sex undergo a complex series of interactions that culminate in cell fusion. A new study on gamete interaction in plants has identified the first protein in multicellular organisms shown by gene disruption to be essential for gamete membrane adhesion.
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In flowering plants, sperm cells develop in the pollen cytoplasm and are transported through floral tissues to an ovule by a pollen tube, a highly polarized cellular extension. After targeting an ovule, the pollen tube bursts, releasing two sperm that fertilize an egg and a central cell. Here, we identified the gene encoding Arabidopsis HAP2, demonstrating that it is allelic to GCS1. HAP2 is ex...
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Fertilization involves several precisely coordinated steps, including sperm dispersal of the oocyte cumulus mass, adhesion and binding to the zona pellucida, penetration through the zona pellucida, and fusion with the oocyte. Hyaluronidase, which is present in the sperm head, is known to be essential for the decomposition of the oocyte cumulus mass. Interestingly, two types of hyaluronidase—SPA...
متن کاملSperm transport and retention at the fertilization site is orchestrated by a chemical guidance and oviduct movement.
In mammals, only a few spermatozoa arrive at the fertilization site. During the last step in the journey to the egg, apart from their self-propulsion, spermatozoa may be assisted by oviduct movement and/or a guidance mechanism. The proportion of rabbit spermatozoa that arrive at the fertilization site was determined under in vivo conditions, in which either the ovulation products (secreting che...
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ژورنال
عنوان ژورنال: Development
سال: 1990
ISSN: 1477-9129,0950-1991
DOI: 10.1242/dev.109.2.495