By Marian R. Goldsmith, Adam S. Wilkins
The members current a various selection of chapters on uncomplicated learn on the molecular point utilizing Lepidoptera as version platforms. This quantity, despite the fact that, is greater than only a compendium of knowledge approximately insect structures as a rule, or the Lepidoptera particularly. each one bankruptcy is a self-contained remedy of a wide topic zone, delivering enough heritage details to provide readers a feeling of the guiding ideas and significant questions linked to every one subject, as well as significant methodologies and findings. Comparisons with different significant version platforms are emphasised, with designated recognition given to the fruitfly Drosophila melanogaster. issues comprise: an historic assessment of analysis utilizing Lepidopteran versions, silkworm genetics, cellular components of Lepidopteran genomes, experimental embryogenesis and homeotic genes, hormone motion within the important apprehensive approach, the molecular genetics of moth olfaction, and use of engineered baculoviruses for uncomplicated organic reviews and bug pest keep watch over.
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Additional info for Molecular Model Systems in the Lepidoptera
R. Goldsmith The second area has been in comparative studies of various structural gene products, in particular those of the chorion and the cuticle. Work with chorion (eggshell) proteins revealed one of the most extensive multigene families recognized to date. Kafatos and his students began their analyses with species of Antheraea. Later they turned to Bombyx to reduce the complications that population polymorphism contributed to the heterogeneity of the chorion protein array and to take advantage of chorion mutants in studying cell differentiation and morphogenesis of the eggshell.
R. Goldsmith Even in the absence of dosage compensation, it would be of interest to find out whether heterochromatization of the W chromosome shares any features with the better known phenomenon of X chromosome inactivation in mammals (Lyon, 1992; Riggs and Pfeifer, 1992). The identification of W-specific sequences would facilitate further investigation of this process at the molecular level. As in most insects and in many other animals and plants, terminally differentiated tissues in the Lepidoptera undergo DNA endoreduplication without cell division, the levels depending on the tissue (D'Amato, 1989).
Still, much progress has been made. We have learned from studies with H. cecropia cuticular proteins (Cox and Willis, 1985; Willis, 1987, 1989), as well as those with locusts (Andersen, 1979), that the physical properties of cuticles are reflected in the electrophoretic properties of cuticular proteins. Originally, mechanical properties of cuticle had been correlated only with chitin and water content and degree of sclerotization; now we recognize that the more acidic proteins are extracted from flexible cuticles and that across orders one can distinguish a cuticular protein sequence as coming either from flexible or rigid cuticles (Willis, 1987, 1989; Lampe and Willis, 1994).
Molecular Model Systems in the Lepidoptera by Marian R. Goldsmith, Adam S. Wilkins