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YOLK PROTEIN UPTAKE IN THE OOCYTE OF THE MOSQUITO AEDES AEGYPTI. L
Open accessAbstract
Yolk proteins are thought to enter certain eggs by a process akin to micropinocytosis but the detailed mechanism has not been previously depicted. In this study the formation of protein yolk was investigated in the mosquito Aedes aegypti L. Ovaries were fixed in phosphate-buffered osmium tetroxide, for electron microscopy, before and at intervals after a meal of blood. The deposition of protein yolk in the oocyte was correlated with a 15-fold increase in 140 mµ pit-like depressions on the oocyte surface. These pits form by invagination of the oocyte cell membrane. They have a 20 mµ bristle coat on their convex cytoplasmic side. They also show a layer of protein on their concave extracellular side which we propose accumulates by selective adsorption from the extraoocyte space. The pits, by pinching off from the cell membrane become bristle-coated vesicles which carry the adsorbed protein into the oocyte. These vesicles lose the coat and then fuse to form small crystalline yolk droplets, which subsequently coalesce to form the large proteid yolk bodies of the mature oocyte. Preliminary radioautographs, and certain morphological features of the fat body, ovary, and midgut, suggest that the midgut is the principal site of yolk protein synthesis in the mosquito.
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Metadata
- Authors
- Roth, T. F., & Porter, K. R.
- Venue
- The Journal of Cell Biology
- Publisher
- Rockefeller University Press
- Published
- 1964-02-01
- Volume
- 20
- Issue
- 2
- Pages
- 313-332
- ISSN
- 0021-9525 (ISSN-L)
- 1540-8140
- OpenAlex
- W2062070852
- Cited by
- 1,318
- References
- 0
- FWCI
- 48.32
- Type
- journal article
- Language
- en
- Open access
- green
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