Summary
The development of cuticular patterns in the legs ofDrosophila melanogaster was studied in the temperature-sensitive cell autonomous lethal mutant1 (1)ts726 by treating animals with heat pulses of two days' duration at different developmental stages, in order to find out whether or not models which account for regulation of imaginal discs in the late third instar also hold for earlier developmental periods. Eight kinds of phenotypes were found, each of which occurred only after heat pulses that started at particular time: (1) complete and incomplete mirror image duplications of mesothoracic legs: early second instar; (2) homoeotic transformation to wing hinge in mesothoracic legs: early second instar; (3) prothoracic leg fusions: early second instar; (4) hypertrophied sex combs: early third instar; (5) outgrowths: early third instar; (6) sex comb teeth on second tarsal segment: early third instar; (7) reversed bristle polarity in intersegmental membrane gaps: early third instar; (8) deleted individual bristles: middle of third instar. These phenotypes were compared with patterns predicted by two models that have been devised to account for regeneration data: the polar coordinate model, and the gradient-of-morphogenetic-potential model. Some of the data (especially the finding of circumferentially incomplete partial duplicates) are more readily predicted by the polar coordinate model, although neither model can be ruled out. Phenotypes (6) and (7) can be accounted for by postulating a tandemly repeated positional signal corresponding to tarsal segmentation. The homoeotic transformation may be due to a transdetermination event occurring in situ during regulative growth following cell death. Since deletion of individual sex comb teeth leads to altered sex comb rotation, it is suggested that adjacent sex comb tooth cells interact during rotation.
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Address until September 1978: Institute of Molecular Biology, Billrothstraße 11, 5020 Salzburg, Austria
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Postlethwait, J.H. Development of cuticular patterns in the legs of a cell lethal mutant ofDrosophila melanogaster . Wilhelm Roux' Archiv 185, 37–57 (1978). https://doi.org/10.1007/BF00848214
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DOI: https://doi.org/10.1007/BF00848214