Vitellogenesis
Mostrando 37-45 de 45 artigos, teses e dissertações.
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37. AHR38, a homolog of NGFI–B, inhibits formation of the functional ecdysteroid receptor in the mosquito Aedes aegypti
In anautogenous mosquitoes, vitellogenesis, the key event in egg maturation, requires a blood meal. Consequently, mosquitoes are vectors of numerous devastating human diseases. After ingestion of blood, 20–hydroxyecdysone activates yolk protein precursor (YPP) genes in the metabolic tissue, the fat body. An important adaptation for anautogenicity is the pr
Oxford University Press.
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38. An oocyte-expressed alpha-tubulin gene in Xenopus laevis; sequences required for the initiation of transcription.
We have studied the expression of X alpha T14, a member of the alpha-tubulin multigene family in Xenopus laevis. Small amounts of X alpha T14 RNA are detectable in a range of cell types, but much higher levels are present in ovary and tissue culture cells. In oocytes X alpha T14 transcripts accumulate during early vitellogenesis but their level declines in m
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39. Cloning of cDNA and estrogen-induced hepatic gene expression for choriogenin H, a precursor protein of the fish egg envelope (chorion)
A cDNA for choriogenin H (Chg H; formerly high-molecular weight spawning female-specific substances, or H-SF), a precursor protein of the inner layer subunits of egg envelope (chorion) of the teleost fish, Oryzias latipes, was cloned and analyzed. The clone consisted of 1913 bp and contained an open reading frame encoding a signal peptide of 22 aa and Chg H
The National Academy of Sciences of the USA.
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40. Differential control of yolk protein gene expression in fat bodies and gonads by the sex-determining gene tra-2 of Drosophila.
We studied the regulation of the yolk protein (YP) genes in the somatic cells of the gonads, using temperature sensitive mutations (tra-2ts) of transformer-2, a gene required for female sexual differentiation. XX;tra-2ts mutant animals were raised at the permissive temperature so that they developed as females and were then shifted to the restrictive male-de
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41. Membranous intermediates in endocytosis are labile, as shown in a temperature-sensitive mutant.
Membranous tubules, especially prevalent in mammalian absorptive epithelia and insect oocytes, are one of the pleomorphic endocytic compartments that have a role in receptor-mediated endocytosis. To determine whether these tubules are evanescent, and to investigate their temporal relationships with other endocytic intermediates, we studied these tubules duri
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42. Transcriptional profiling reveals multifunctional roles for transferrin in the honeybee, Apis mellifera
Transferrins belong to a family of iron-binding proteins that have been implicated in innate immunity and in vitellogenesis in insects. Here we have sequenced and characterized a full-length cDNA encoding a putative iron-binding transferrin (AmTRF) in the honeybee. AmTRF shows high level of sequence identity with transferrins in both vertebrates and insects
University of Arizona Library.
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43. Eggshell and egg yolk proteins in fish: hepatic proteins for the next generation: oogenetic, population, and evolutionary implications of endocrine disruption
The oocyte is the starting point for a new generation. Most of the machinery for DNA and protein synthesis needed for the developing embryo is made autonomously by the fertilized oocyte. However, in fish and in many other oviparous vertebrates, the major constituents of the egg, i.e. yolk and eggshell proteins, are synthesized in the liver and transported to
BioMed Central.
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44. The endocrine control of reproduction in Nereidae: a new multi-hormonal model with implications for their functional role in a changing environment
Nereidae are vital to the functioning of estuarine ecosystems and are major components in the diets of over-wintering birds and commercial fish. They use environmental cues to synchronize reproduction. Photoperiod is the proximate cue, initiating vitellogenesis in a temperature-compensated process. The prevailing paradigm in Nereidae is of a single ‘juveni
The Royal Society.
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45. Identity of a second type of allatostatin from cockroach brains: an octadecapeptide amide with a tyrosine-rich address sequence.
An octadecapeptide that inhibits juvenile hormone synthesis has been isolated by HPLC from brain-retrocerebral complexes of the cockroach Diploptera punctata. The primary structure of this allatostatin has been elucidated by tandem mass spectrometry: Ala-Tyr-Ser-Tyr-Val-Ser-Glu-Tyr-Lys-Arg-Leu-Pro-Val-Tyr-Asn-Phe-Gly-Leu- NH2 (ASB2). The amidated three-resid