Time Sequence of Early Events in Fertilization in the Medaka Egg. (micropyle/exocytosis/sperm movement/calcium release/medaka egg)
نویسندگان
چکیده
منابع مشابه
Early ionic events in activation of the mammalian egg.
At fertilization of the mammalian egg, the spermatozoon initially binds to and then fuses with the egg plasma membrane. This critical event activates specific biochemical pathways within the egg. Activation of the egg induces resumption of meiosis and the start of rapid embryonic mitotic divisions on the one hand, and cortical granule exocytosis leading to modification of the zona pellucida and...
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reproductive risk of incomplete fertilization (Mortensen, 1938). Given evidence of at least occasional sperm limitation in marine environments (Levitan and Petersen, 1995; Yund, 2000), recent work has examined whether this risk is reduced by particular features of adults or gametes that could improve chances of sperm–egg encounter (Denny et al., 1992; Levitan et al., 1992; Petersen et al., 1992...
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Calcium plays a strikingly important role in two of the major events in developmental biology: cell activation and differentiation. In this review we begin with the location and quantity of intracellular calcium in sea urchin oocytes, and then discuss the changes that occur during fertilization and egg activation, placing special emphasis on the mobilization and redistribution of intracellular ...
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The molecular machinery that mediates sperm-egg interactions at fertilization is largely unknown. We identify two partially redundant egg surface LDL receptor repeat-containing proteins (EGG-1 and EGG-2) that are required for Caenorhabditis elegans fertility in hermaphrodites, but not males. Wild-type sperm cannot enter the morphologically normal oocytes produced by hermaphrodites that lack egg...
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An increase in intracellular Ca2+ concentration ([Ca2+]) and morphological were simultaneously observed by epifluorescence and differential interference contrast (DIC) microscopy during fertilization of the sand dollar, Clypeaster japonicus. [Ca2+], which was detected by a Ca2+ indicator, Fluo-3, initially increased just beneath the sperm-attached site on the egg surface 8.6 sec after attachmen...
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ژورنال
عنوان ژورنال: Development, Growth and Differentiation
سال: 1991
ISSN: 0012-1592,1440-169X
DOI: 10.1111/j.1440-169x.1991.00479.x