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  • 1
    Electronic Resource
    Electronic Resource
    Cell proliferation patterns in the wing imaginal disc of Drosophila
    Amsterdam : Elsevier
    Mechanisms of Development 46 (1994), S. 183-200 
    Details
    ISSN: 0925-4773
    Keywords: Cell proliferation centers ; Compartments ; Morphogenesis ; Venation pattern
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0925-4773(94)90070-1
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  • 2
    Electronic Resource
    Electronic Resource
    Inductive mechanisms in the process of wing vein formation inDrosophila (1977)
    Springer
    Development genes and evolution 182 (1977), S. 93-106 
    Details
    ISSN: 1432-041X
    Keywords: Induction and Competence ; Pattern formation ; Compartments
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The mechanisms underlying the formation of veins in the wing ofDrosophila have been studied by means of clonal analysis. To this end the phenotype of vein-suppression mutants (crossveinless, veinlet andradius incompletus), the vein-addition mutantplexus and a mutant causing the appearance of chaetae on the wing veins (hairy) were analysed both singly and in double mutant combinations. Subsequently various combinations of these mutants were studied in genetic mosaics. The results indicate that the cells of the dorsal surface of the wing express their genetic constitution autonomously with respect to these mutations. The ventral surface, however, has a non-autonomous behaviour with respect to vein formation but an autonomous one with respect to chaeta differentiation. Since chaeta differentiation is determined before puparium formation, i.e. before both wing surfaces some into contact, it is suggested that vein determination results from a genetic decision occurring autonomously and independently in the cells of both wing surfaces, also prior to pupariation. The final extension and course of the wing veins are modulated by cells of the dorsal surface inducing the genetically competent cells of the ventral surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00848050
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  • 3
    Electronic Resource
    Electronic Resource
    Minute mosaics caused by early chromosome loss (1977)
    Springer
    Development genes and evolution 183 (1977), S. 337-349 
    Details
    ISSN: 1432-041X
    Keywords: Gynandromorphs ; Minute mosaics ; Segments ; Compartments
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Two genetic operations have been combined in order to ascertain whether there are differential proliferation rates in the syncytial nuclei and the blastoderm cells prior to the formation of the imaginal disc anlagen. Early chromosome loss caused by the mutantca nd has been associated with the generation ofMinute (M/M +) genotypes in normal (M +/M +) zygotes or of non-Minute genotypes inMinute zygotes. The results indicate that there is no growth competition betweenMinute and non-Minute cells prior to the formation of the imaginal discs. Growth competition, however, leads later, during the proliferation phase of the discs, to the demarcation of compartment boundaries within imaginal discs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00848462
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  • 4
    Electronic Resource
    Electronic Resource
    Maintenance of determination by cells of imaginal discs ofDrosophila after dissociation and culture in vivo (1976)
    Springer
    Development genes and evolution 180 (1976), S. 189-206 
    Details
    ISSN: 1432-041X
    Keywords: Cell Proliferation ; Stability of Determination ; Compartments
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Wild type cells of imaginal wing discs or embryos were dissociated and mixed in different proportions with cells of genetically marked wing and/or leg discs. These latter were X-irradiated to such an extent that their rate of proliferation was drastically lowered. They served as a “feeding layer” in which the interspersed wild type cells could be cultured. The reaggregates were allowed to grow in vivo, and fragments of them were tested for recovery of imaginal structures formed by wild-type cells. The experimental conditions for maximal dilution and maximal recovery of wildtype cells were first analysed. Under these conditions the progeny of cells deriving from different fragments of mature wing discs are capable of forming large territories of cuticle. These consisted preferentially of structures located in the region from which their ancestral cells were derived. The proliferating cells remained confined to either the anterior or the posterior wing compartments, but were apparently able to transgress the dorsalventral compartment border. Cells with qualities for distinct imaginal discs and possibly regions could also be recovered from dissociated embryos of 7 h age. The efficiency with which imaginal structures could be recovered as well at the types or qualities of these structures did not depend on the histotype of the feeding layer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00848574
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