By Kevin Moses (auth.), Dr. Kevin Moses (eds.)
The compound eye of Drosophila is used as a version for human affliction and homology to eyes in different taxa. This booklet covers the most important discoveries at the improvement of the compound eye of Drosophila melanogaster during the last 25 years. those contain facets of the organic mechanisms of trend formation within the anxious approach, the specification of neuronal mobilephone varieties, unforeseen phylogenetic conservation and plenty of new insights into the functionality of numerous sign transduction pathways. All chapters during this e-book were written by way of top specialists during this box who've made major contributions to our realizing of fly eye development.
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Additional info for Drosophila Eye Development
D. E. Treisman dachshund (dac; see G. Mardon, Chap. ) is not induced despite the presence of the upstream Pax-6 homologues encoded by eyeless (ey) and twin of eyeless (Quiring et al. 1994; Chen et al. 1999; Czerny et al. 1999; Curtiss and Mlodzik 2000). This may explain the requirement for dpp in initiation, as loss of Mad function at the posterior margin can be rescued by supplying eya (Curtiss and Mlodzik 2000). Ectopic dpp induces expression of eya, so and dac at the anterior eye disc margin, and ectopic ey can induce expression of these genes in other imaginal discs only when dpp is also present, confirming a critical role for dpp at this stage (Pignoni and Zipursky 1997; Halder et al.
Nature 396:272-276 Cho K-O, Chern I, Izaddoost S, Choi K-W (2000) Novel signaling from the peripodial membrane is essential for eye disc patterning in Drosophila. Cell 103:331-342 Curtiss I, Mlodzik M (2000) Morphogenetic furrow initiation and progression during eye development in Drosophila: the roles of decapentaplegic, hedgehog and eyes absent. Development 127:1325-1336 Czerny T, Halder G, Kloter U, Souabni A, Gehring WI, Busslinger M (1999) twin of eyeless, a second Pax-6 gene of Drosophila, acts upstream of eyeless in the control of eye development.
The hh homologues Sonic hedgehog (Shh) and Tiggywinkle hedgehog (twhh) are expressed in the zebrafish ganglion cell layer at the time of ganglion cell differentiation and in the adjacent retinal pigmented epithelium at the time of photoreceptor differentiation (Neumann and Niisslein-Volhard 2000; Stenkamp et al. 2000). Reduction of Shh and Twhh production by antisense oligonucleotide injection, or using null mutations in the shh gene sonic you (syu), reduces retinal ganglion cell and rod photoreceptor differentiation, while blocking all Hh family signaling with cyclopamine can prevent ganglion cell neurogenesis (Neumann and Niisslein-Volhard 2000; Stenkamp et al.