File:Nematode C. elegans Oocyte Meiotic Maturation and Egg Activation.jpg

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Description Figure 1. Oocyte Meiotic Maturation and Egg Activation. The oocytes of most animal species arrest in meiotic prophase I (reviewed by Masui and Clarke, 1979; Masui, 2001). In response to a hormonal stimulus (1-methyladenine in starfish; progesterone in Xenopus; MSP in C. elegans), oocytes begin meiotic maturation: the nuclear envelope breaks down (GVBD), as the oocyte enters M-phase from prophase. The point of fertilization is species-specific. In the case of C. elegans (I) fertilization occurs after maturation but prior to completion of meiosis I. In C. elegans, fertilization is required for completing both meiotic divisions. For most insects (II), fertilization occurs at metaphase or anaphase I. In most vertebrates (III), fertilization occurs at metaphase II. Sea urchins complete meiosis before fertilization (IV).
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Source http://www.wormbook.org/chapters/www_controloocytematuration/controloocytematuration.html Greenstein, D. Control of oocyte meiotic maturation and fertilization (December 28, 2005), WormBook, ed. The C. elegans Research Community, WormBook, doi/10.1895/wormbook.1.53.1, http://www.wormbook.org.
Author Greenstein, D.

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This file, which was originally posted to http://www.wormbook.org/chapters/www_controloocytematuration/controloocytematuration.html Greenstein, D. Control of oocyte meiotic maturation and fertilization (December 28, 2005), WormBook, ed. The C. elegans Research Community, WormBook, doi/10.1895/wormbook.1.53.1, http://www.wormbook.org., was reviewed on 27 February 2024 by reviewer Yann, who confirmed that it was available there under the stated license on that date.

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current10:29, 27 February 2024Thumbnail for version as of 10:29, 27 February 20241,744 × 1,240 (407 KB)Rasbak (talk | contribs){{Information |description=Figure 1. Oocyte Meiotic Maturation and Egg Activation. The oocytes of most animal species arrest in meiotic prophase I (reviewed by Masui and Clarke, 1979; Masui, 2001). In response to a hormonal stimulus (1-methyladenine in starfish; progesterone in Xenopus; MSP in C. elegans), oocytes begin meiotic maturation: the nuclear envelope breaks down (GVBD), as the oocyte enters M-phase from prophase. The point of fertilization is species-specific. In the case of C. eleg...

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