Download A Comparative Overview of Mammalian Fertilization by J. Michael Bedford (auth.), Bonnie S. Dunbar, Michael G. PDF

By J. Michael Bedford (auth.), Bonnie S. Dunbar, Michael G. O’Rand (eds.)

In 1964, the Fertilization and Gamete body structure examine education software (FERGAP) was once proven on the Marine organic Laboratories, Woods gap, Massachusetts. Over the process the following 12 years, lower than the directorship of Dr. Charles B. Metz, FERGAP introduced jointly, expert, and encouraged a new release of scholars in reproductive biology from around the world. As scholars of C. B. Metz and as FERGAP trainees, we want to devote this gathered paintings on comparative mammalian fertilization to our instructor and mentor, Dr. Charles B. Metz. Like a few authors contributing to this quantity, now we have been struck by way of the numerous impression that C. B. Metz and FERGAP had at the improvement of scholars of reproductive biology. employing either the classical and molecular strategies of mobile biology and immunology to difficulties of gamete biology, Dr. Metz emphasised a comparative and analytical strategy that used to be mirrored in his personal learn on fertilization in Paramecia, sea urchins, frogs, and mammals. it's was hoping that this quantity will serve to stimulate scholars to find the myriad of attention-grabbing study difficulties in gamete and reproductive biology. Bonnie S. Dunbar Michael G. O'Rand Houston, Texas Chapel Hill, North Carolina ix Contents half I COMPARATIVE evaluate OF MAMMALIAN GAMETES The Coevolution of Mammalian Gametes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . three J. Michael Bedford I. advent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . three 2. Gamete layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . four 2.1. Monotremes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . five . . . . . . . . . . . . . . 2.2. Marsupials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . five . . . . . . . . . . . . . . . 2.3. Eutherians . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . nine three. Gamete Maturation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 . . . . . . . . . . . . . . . three .1. Oocyte Maturation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 . . . . . . . . . . . . . 3.2. Sperm Maturation within the Male . . . . . . . . . . . . . . . . . . . . . . . 15 . . . . . . . . . .

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3. GAMETE MATURATION As used in the present context, the "maturation" of eggs and spermatozoa occurs at different biological stages. The oocyte maturation discussed here refers to events associated with the resumption of meiosis that parallel the acquisition of fertilizability. Sperm maturation refers to the events that take place in spermatozoa after their release from the gonad--events undergone in the epididymis and in the female tract. 1. Oocyte Maturation In considering the maturation of mammalian oocytes, it is unfortunate to find that most functional observations still relate to the Eutheria alone (Masui and Clarke, 1979).

There is still a major question as to the role that capacitation plays in the conception process: What is its functional significance? Some years ago, I proposed that capacitation may have arisen as a consequence of evolutionary change in the eutherian egg vestments, providing a necessary alternative means of regulating the acrosome reaction and (through hyperactivation) physical thrust of a quality needed for penetration of an unusually resilient zona pellucida (Bedford, 1983b). Now it is necessary to modify those ideas.

69:415-428. , 1987, In vitro penetration of hamster oocyte-cumulus complexes using physiological numbers of sperm, Dev. Bioi. 122:227-242. , and Bedford, J. , 1991, Hamster oocyte penetrability during preovulatory maturation, Malec. Reprod. Dev. 29:72-76. Cummins, J. , 1980, Decondensation of sperm nuclei of Australian marsupials: Effects of air drying and of calcium and magnesium, Gamete Res. 3:351-367. Cummins, J. , 1982, Hyperactivated motility patterns of ram spermatozoa recovered from oviducts of mated ewes, Gamete Res.

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