Development, Structure, and Function of Coverings of Eggs of Floodwater Mosquitoes. III. Functions of Coverings1

Harwood, Robert F.; Horsfall, William R.

doi:10.1093/aesa/52.2.113

Cited by 32 publications

(23 citation statements)

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“…In certain mosquitoes the serosa secretes an additional proteinaceous membrane that provides extra protection against desiccation (Harwood, 1958;Harwood and Horsfall, 1959). The changes in gene expression in the D. melanogaster and A. gambiae dorsal ectoderm provide a basis for understanding the evolutionary transition of two dorsal tissues in A. gambiae into a novel single tissue in higher dipterans.…”

Section: Evolution Of Mesoderm Invaginationmentioning

confidence: 99%

Evolution of the dorsal-ventral patterning network in the mosquito,Anopheles gambiae

et al. 2007

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The dorsal-ventral patterning of the Drosophila embryo is controlled by a well-defined gene regulation network. We wish to understand how changes in this network produce evolutionary diversity in insect gastrulation. The present study focuses on the dorsal ectoderm in two highly divergent dipterans, the fruitfly Drosophila melanogaster and the mosquito Anopheles gambiae. In D. melanogaster, the dorsal midline of the dorsal ectoderm forms a single extra-embryonic membrane, the amnioserosa. In A. gambiae, an expanded domain forms two distinct extra-embryonic tissues, the amnion and serosa. The analysis of approximately 20 different dorsal-ventral patterning genes suggests that the initial specification of the mesoderm and ventral neurogenic ectoderm is highly conserved in flies and mosquitoes. By contrast, there are numerous differences in the expression profiles of genes active in the dorsal ectoderm. Most notably, the subdivision of the extra-embryonic domain into separate amnion and serosa lineages in A. gambiae correlates with novel patterns of gene expression for several segmentation repressors. Moreover, the expanded amnion and serosa anlage correlates with a broader domain of Dpp signaling as compared with the D. melanogaster embryo. Evidence is presented that this expanded signaling is due to altered expression of the sog gene.

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Section: Evolution Of Mesoderm Invaginationmentioning

confidence: 99%

Evolution of the dorsal-ventral patterning network in the mosquito,Anopheles gambiae

et al. 2007

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“…It has been proposed that there is a chitin-like component present in mosquito eggshells (Beckel, 1958;Harwood and Horsfall, 1957;Harwood, 1958;Powell et al, 1986). There is no doubt that eggshells or egg coverings play an important role in the survival of mosquito species.…”

Section: Introductionmentioning

confidence: 99%

“…Not all of the researchers focusing on eggshells agree about the number of layers that form the A. aegypti shell. Some consider it as having two layers (Powell et al, 1986(Powell et al, , 1987, whereas others conclude that it has three layers (Beckel, 1958;Harwood, 1958;Clements, 1992). X-ray diffraction studies (Harwood, 1958).…”

Section: Introductionmentioning

confidence: 99%

“…Some consider it as having two layers (Powell et al, 1986(Powell et al, , 1987, whereas others conclude that it has three layers (Beckel, 1958;Harwood, 1958;Clements, 1992). X-ray diffraction studies (Harwood, 1958). Histochemical tests suggested that a chitin-like component is a component of the shell (Beckel, 1958), but the presence of chitin has never been confirmed by other techniques.…”

Section: Introductionmentioning

confidence: 99%

“…Histochemical tests suggested that a chitin-like component is a component of the shell (Beckel, 1958), but the presence of chitin has never been confirmed by other techniques. In addition, there is no agreement about the tissue source of the chitin-like component; some authors suggested that it is of embryonic origin (Harwood and Horsfall, 1959;Clements, 1992), while others have indicated that it is synthesized by ovarian follicular epithelial cells (Powell et al, 1986).…”

Section: Introductionmentioning

confidence: 99%

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