Sperm chemotaxis in marine invertebrates and mammals
نویسندگان
چکیده
منابع مشابه
Crisp proteins and sperm chemotaxis: discovery in amphibians and explorations in mammals.
Crisp proteins appear to play multiple roles in the life history of sperm. One of these roles is to act as a sperm chemoattractant. Allurin, a 21 kDa Crisp protein rapidly released from the egg jelly of at least two frogs, X. laevis and X. tropicalis, elicits directed motility in both homospecific and heterospecific sperm. In X. tropicalis, allurin is coded for by the newly documented Crisp A g...
متن کاملTowards Understanding the Molecular Mechanism of Sperm Chemotaxis
The awareness that, in most animal species, the prospects of the male's spermatozoa to reach the female's eggs are very slim in the absence of some guidance mechanism (usually chemical in nature) has been acquired gradually; first, in marine species, where both types of gametes are released into sea water (for review see Miller, 1985), and ultimately, in the last decade or so, in mammals (for r...
متن کاملSperm competition in mammals.
Although Darwin identified the evolutionary significance of competition between males in the context of reproduction, it is only in the past few decades that we have begun to appreciate the importance of competition at the gametic level. Sperm competition, defined as competition between the sperm of two or more males for fertilization of the same set of ova, is now recognised as a key selective...
متن کاملSperm competition influences sperm size in mammals.
Among mammals sperm competition leads to selection for increased sperm numbers but it is not known whether it also leads to changes in sperm size. Two contrasting theoretical predictions have been made. The first hypothesis relies on the assumption that there is a trade-off between sperm numbers and sperm size and predicts that, in species confronting sperm competition, there will be a concomit...
متن کاملSperm competition influences sperm size in mammals
Among mammals sperm competition leads to selection for increased sperm numbers but it is not known whether it also leads to changes in sperm size. Two contrasting theoretical predictions have been made. The first hypothesis relies on the assumption that there is a trade-off between sperm numbers and sperm size and predicts that, in species confronting sperm competition, there will be a concomit...
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ژورنال
عنوان ژورنال: Reproductive and Developmental Medicine
سال: 2017
ISSN: 2096-2924
DOI: 10.4103/2096-2924.216863