HORMONAL CONTROL OF OOCYTE MATURATION IN ARENICOLA MARINA L. (ANNELIDA, POLYCHAETA) I. MORPHOLOGICAL STUDY OF OOCYTE MATURATION |
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Authors: | L MEIJER |
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Affiliation: | Universitédes Sciences et Techniques de Lille I, Service de Biologie Animate, Laboratoire ?d'Endocrinologie Comparée des Invertébrés (Prof. M. DURCHON) (L. A. CNRS No. 148), B. P. 36, 59650-Villeneuve ?Ascq, FRANCE. |
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Abstract: | In Arenicola marina (Annelida, Polychaeta) the oocytes are arrested in the first prophase stage of mciosis until spawning. Oocyte maturation is under hormonal control: when incubated in vitro in a brain extract oocytes reach the first metaphase at which they remain arrested until fertilization. The meiosis reinitiating substance induces numerous morphological changes in the oocytes: general (shape), cortical (microvilli retraction, plasma membrane flattening), cytoplasmic (cortical granules repartition) and nuclear modifications (germinal vesicle breakdown, chromosome condensation, formation of a meiotic maturation spindle). A kinetic study of these morphological modifications has been performed. |
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