By Alexander S. Raikhel (auth.), Kerry F. Harris (eds.)
Volume nine during this sequence comprises 4 chapters on vectors that have an effect on human or animal wellbeing and fitness and 6 chapters on plant pathogens and their vectors. In bankruptcy 1, Alex S. Raikhel discusses vitellogenesis in mosquitoes: the cornerstone of the reproductive cycle concerning large creation of yolk precursors by way of the fats physique and their accumulation in constructing oocytes. In anautogeneous mosquitoes, vitellogenesis relies at the availability of a blood meal and, for this reason, is associated with transmission of pathogens. as a result, elucidation of mechanisms governing the mosquito vitellogenesis is important for the profitable improvement of novel options in vector and disorder administration. past studies on mosquito vitellogenesis have dealt predominantly with hormonal regulate. The target of this overview, despite the fact that, is to summarize major growth which has been accomplished in figuring out mosquito vitellogenesis on the mobile, biochemical and molecular degrees. it's with those disciplines that we predict to completely comprehend the mechanisms governing this key approach in mosquito reproduction.
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Extra resources for Advances in Disease Vector Research
Mosquito Vitellogenesis 21 At eclosion, A. aegypti oocytes have an undifferentiated cortex and are not competent for protein uptake. 1C; 127). The oocytes remain arrested until a blood meal initiates vitellogenesis. Accumulation of yolk proceeds during next 30-36 hrs. 1 C; 131). Egg maturation is completed in about 48-60 hrs PBM. Accumulative Pathway of Vitellogenin in the Oocyte Endocytosis of yolk proteins by developing oocytes is a central event in insect vitellogenesis. Selective uptake of extraovarian yolk protein precursors by Hyalophora oocytes suggested to Telfer a role for endocytosis in yolk accumulation (146).
H. O. Lea, and P. Romans who kindly sent recent reprints and preprints of their unpublished work. Thanks to Drs. S. O. R. Brown for critical reading of the manuscript, and Mrs. R. Bickert for the excellent help in making the graphs and formatting the manuscript. This work was supported by grants AI-24716, HD-22958 and AI-32154 from the National Institutes of Health. 32 Alexander S. Raikhel References 1. , J. Cell BioI. 50:201-221. 2. , 1978, Purification and partial characterization of Culex fatigans yolk protein, Insect Biochem.
In addition. in response to a blood meal, a neurosecretory hormone- 14 Alexander S. Raikhel releasing factor (NHRF) from ovaries stimulated the release of EDNH from the CC (94). Brain hormone, presumably EDNH, was shown to stimulate production of ecdysteroids by mosquito ovaries (67). Recently, ovarian ecdysteroidogenic hormones (OEH) with molecular weights between 6,500 and 13,000 have been isolated from the brain of the mosquito, A. aegypti (101). Since the site(s) of EDNH action has not been established in Lea's initial observations, it is not clear whether OEH is the full equivalent of EDNH, or whether there are more brain factors essential for vitellogenesis.
Advances in Disease Vector Research by Alexander S. Raikhel (auth.), Kerry F. Harris (eds.)