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KMID : 0364219880310040318
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Korean Journal of Zoology
1988 Volume.31 No. 4 p.318 ~ p.326
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Studies on Oogenesis in Drosophila melanogaster. I. Ultrastructural Changes in the Process of Transport of Yolk Protein within the Egg Chamber during Oogenesis of Drosophila melanogaster
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Lee Yang-Rim
Park Sung-Soon
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Abstract
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As yolk proteins are transported from !he follicle cells into oocvtes, vitelline body forms and changes into a vitelline membrane between the ko celt types during the vitellogenic period. Cell membranes of oocyte and follicle cells surrounding the oocyte disappear at stage 7 and high electron-dense substance of vitelline body simultaneously accumulates sporadically between the cell types. The vitelline body becomes surrounded by linkage bridge, a membranous structure, at stage 9 and greatly increases in thickness to be 5-7 U m thick at stage 11. At stage 13 the vitelline body becomes vitelline membrane, which is now only 1 U m thick, suggesting that much of the substance of the vitelline body has been transported into oocyte. Various types of vesicles including coated vesicles were observed at both sides of th vitelline body. The vesicles occurred at the side of oocyte were interpreted to be structures transported from the vitelline body into oocyte, whereas those found at the side of the follicle cells were thought to be structures made in the follicle cells and fused into the vitelline body.
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KEYWORD
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Yolk proteins , Oogenesis , D. Melanogaster
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