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- W2158835911 abstract "Abstract Vitellogenins ( V g ) genes code for the major egg yolk protein precursor in insects and many other oviparous species. In insects, the V g gene is expressed extra‐ovarially in the fat body in sex‐, tissue‐ and stage‐specific manners. During the reproductive phase, the V g m RNA is expressed in large quantities, which is then translated, secreted into hemolymph and ultimately taken up by the developing oocytes through receptor‐mediated endocytosis. Once sequestered, the V g s are stored as vitellin ( V n), the main nutritional reserve for the developing embryo. The regulation of V g genes is directly under the control of hormones at the transcriptional level. Hormones involved in V g gene transcription are juvenile hormone ( JH ), ecdysteroids and some neuropeptides. The overall understanding that has emerged is that the insects can be classified, based on the system of hormonal regulation of V g gene transcription, into three groups: (i) insects (like most of hemipterans) that use only JH for V g gene transcription; (ii) insects (like dipterans) that need both JH and ecdysteroids for V g regulation; and (iii) insects like lepidopterans that require JH , ecdysteroids and additional hormones to regulate their reproductive biology. However, why insect species diverge in using different hormones to govern their reproductive physiology remains unclear. The present contribution focuses on the current status of knowledge regarding the regulation of V g genes in insects. Besides a brief information on biochemical and molecular features, the role of V g genes as a target of endocrine disruptors will be addressed. Also, the molecular mechanism of V g gene regulation will be discussed." @default.
- W2158835911 created "2016-06-24" @default.
- W2158835911 creator A5003967145 @default.
- W2158835911 creator A5014854247 @default.
- W2158835911 creator A5078511929 @default.
- W2158835911 creator A5085876425 @default.
- W2158835911 date "2014-03-07" @default.
- W2158835911 modified "2023-10-09" @default.
- W2158835911 title "Regulation of vitellogenin genes in insects" @default.
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