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  • Drosophila  (150)
  • Springer  (150)
  • Blackwell Publishing Ltd
  • 1985-1989  (150)
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Year
  • 11
    Electronic Resource
    Electronic Resource
    Segmental organisation of the head in the embryo of Drosophila melanogaster (1986)
    Springer
    Development genes and evolution 195 (1986), S. 359-377 
    Details
    ISSN: 1432-041X
    Keywords: Drosophila ; Blastoderm fate map ; Head segmentation ; Larval cuticle
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Embryos of Drosophila melanogaster were irradiated in the presumptive head region with a UV-laser microbeam of 20 μm diameter at two developmental stages, the cellular blastoderm and the extended germ band. The ensuing defects were scored in the cuticle pattern of the head of the first-instar larva, which is described in detail in this paper. The defects caused by irradiating germ band embryos when morphologically recognisable lobes appear in the head region were used to establish the segmental origin of various head structures. This information enabled us to translate the spatial distribution of blastoderm defects into a fate map of segment anlagen. The gnathal segments derive from a region of the blastoderm between 60% and 70% egg length (EL) dorsally and 60% and 80% ventrally. The area anterior to the mandibular anlage and posterior to the stomodaeum is occupied by the small anlagen of the intercalary and antennal segments ventrally and dorsally, respectively. The labrum, which originates from a paired anlage dorsally at 90% EL, is separated from the remaining head segments by an area for which we did not observe cuticle defects following blastoderm irradiation, presumably because those cells give rise to the brain. The dorsal and lateral parts of the cephalo-pharyngeal skeleton appear to be the only cuticle derivatives of the non-segmental acron. These structures derive from a dorso-lateral area just behind the putative brain anlage and may overlap the latter. In addition to the segment anlagen, the regions of the presumptive dorsal pouch, anterior lobe and post-oral epithelium, whose morphogenetic movements during head involution result in the characteristic acephalic appearance of the larva, have been projected onto the blastoderm fate map. The results suggest that initially the head of the Drosophila embryo does not differ substantially from the generalised insect head as judged by comparison of fate map and segmental organisation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00402870
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  • 12
    Electronic Resource
    Electronic Resource
    Analysis of morphogenetic movements in the development of the notum anlage of Drosophila melanogaster (1987)
    Springer
    Development genes and evolution 196 (1987), S. 372-375 
    Details
    ISSN: 1432-041X
    Keywords: Pattern formation ; Morphogenesis ; Drosophila ; Growth ; Imaginal disc
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A comparison of the morphogenetic maps of the notum anlage of Drosophila melanogaster derived from the gynandromorph data and mosaics induced by somatic crossing-over during the first instar larval stage revealed that practically no major morphogenetic movements occur in the development of the anlage between the blastoderm and first instar larval stages and the adult stage. By comparing the morphogenetic map derived from gynandromorphs and the fate map derived from data on the transplantation of fragments of the mature wing imaginal disc, it was observed that no major morphogenetic movements occur in the notum anlage between the stages of the allocation of the disc and the mature disc. The results are consistent with the observations of other authors concerning the larval development of eye-antenna, wing and leg discs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00375774
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  • 13
    Electronic Resource
    Electronic Resource
    Antibodies recognizing 20-hydroxyecdysone-dependent cell surface antigens during morphogenesis in Drosophila (1987)
    Springer
    Development genes and evolution 196 (1987), S. 434-444 
    Details
    ISSN: 1432-041X
    Keywords: Morphogenesis ; Cell Surface ; 20-Hydroxyecdysone ; Drosophila
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Polyclonal antibodies (anti-P116 and anti-P93) specific for two different hormone-dependent cell surface glycoproteins (P116 and P93) from Drosophila S3 cells have been produced. Anti-P116 and anti-P93 each immunoprecipitate substantially more of P116 and P93, respectively, from extracts of iodinated hormone-treated S3 cells compared to controls. Both antigens are present in control and 20-hydroxyecdysone treated imaginal discs, although apparent increases in antigen content are associated with hormone treatment. Immunofluorescent staining of whole discs with anti-P116 and anti-P93 reveals increased amounts of both antigens at the surface of hormone-treated discs compared to controls. Both antibodies were used to characterize the expression of their respective antigens during embryonic development, and both antibodies were found to recognize in embryos a third developmentally-regulated antigen with a relative mobility of approximately 220000. Our results indicate, at least in the case of P116 and P93, that 20-hydroxyecdysone-dependent cell surface antigens in imaginal discs may be regulated both by increasing the amounts of constitutively present proteins, and possibly through biochemical modifications, altering the localization of these proteins from a cytoplasmic to a cell surface domain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00399143
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  • 14
    Electronic Resource
    Electronic Resource
    Appendage morphogenesis in Drosophila: a developmental study of the rotund (rn) gene (1988)
    Springer
    Development genes and evolution 197 (1988), S. 19-26 
    Details
    ISSN: 1432-041X
    Keywords: Drosophila ; Morphogenesis ; Appendages
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The phenotype of rotund (rn) null alleles is described, and compared to wild type. The mutants are expressed zygotically and cause position specific defects in certain imaginal discs (antenna, legs, wing, haltere and proboscis) and their corresponding adult derivatives. In the discs, specific folds are absent in rn mutants compared to wild type. Clonal analysis shows that the rn + gene is partially autonomous in its expression in cells destined to form certain distal parts of the adult appendages. The results are consistent with the idea that the rn + gene is required for normal morphogenesis of specific distal parts of the adult appendages.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00376037
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  • 15
    Electronic Resource
    Electronic Resource
    Fate-mapping in wild-typeDrosophila melanogaster (1985)
    Springer
    Development genes and evolution 194 (1985), S. 181-195 
    Details
    ISSN: 1432-041X
    Keywords: Embryogenesis ; Pattern of cell divisions ; Drosophila
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The pattern of cell proliferation and cell movements inDrosophila embryogenesis has been analysed with the aim of constructing a blastoderm fate map. Post-blastoderm cell proliferation starts at gastrulation and ends around the stage of germ band shortening. Three mitotic waves affect the embryonic cells according to a constant spatio-temporal pattern. For any of these waves mitotic activity starts at well-defined loci, which have been called mitotic centres. During the first and second mitotic waves all cells undergo mitosis, except for those of the amnioserosa, which do not proliferate at all. The third wave spares most of the ectodermal cells. Neuroblasts, progenitors of epidermal sensilla and germ line cells show their own, different pattern of proliferation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00848246
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  • 16
    Electronic Resource
    Electronic Resource
    Lineage analysis of transplanted individual cells in embryos of Drosophila melanogaster (1986)
    Springer
    Development genes and evolution 195 (1986), S. 489-498 
    Details
    ISSN: 1432-041X
    Keywords: Pole cells and midgut progenitors ; Cell lineages ; Embryogenesis ; Drosophila
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary In this paper experiments concerning some aspects of the development of pole cells and midgut progenitors in Drosophila are reported. Cells were labelled by injecting horseradish-peroxidase (HRP) in embryos before pole bud formation and transplanted at different stages into unlabelled embryos, where the transplanted cells developed together with the unlabelled cells of the host. The hosts were then fixed and stained at different ages in order to demonstrate the presence of HRP in the progenies of transplanted cells. The main conlusions of the study are as follows. The gonads are the only organ to the formation of which pole cells normally contribute; those pole cells which do not participate in the formation of the gonads are finally eliminated or degenerate. Since the number of primordial germ cells in the gonads is the same irrespective of the number of pole cells present in the embryo, an (unknown) mechanism must exist regulating the final number of pole cells in each of the gonads. After their formation and before reaching the gonads, pole cells have been found to divide only up to two times. With respect to the midgut progenitors, the cells of both anlagen have been found to be committed to develop into midgut, although they behave as equivalent in that they do not apparently distinguish between the anterior and posterior anlage. Midgut progenitors have been found to divide a maximum of three times and to produce two different types of cells, epithelial cells of the midgut wall and spindle-like cells located internally in the gut.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00375889
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  • 17
    Electronic Resource
    Electronic Resource
    Morphological differentiation of the embryonic peripheral neurons in Drosophila (1987)
    Springer
    Development genes and evolution 196 (1987), S. 69-77 
    Details
    ISSN: 1432-041X
    Keywords: Neurogenesis ; Drosophila ; Neuronal differentiation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The stereotyped segmental and dorso-ventral organization of the peripheral nervous system (PNS) of Drosophila embryos allows the identification of all the neurons in the body wall. Distinct classes of neurons are distinguishable according to their location, the targets they innervate, the particular shape of their dendrites and their cell size. Those neurons innervating external sensory structures (es) and chordotonal organs (ch) have single dendrites and have been previously described (Ghysen et al. 1986; Dambly-Chaudiere and Ghysen 1986; Campos-Ortega and Hartenstein 1985). We describe here the identity and morphological features of three other classes of neurons in the body segments which have multiple dendrites (md neurons): 1) neurons that give rise to elaborate dendritic arborisations (da neurons); 2) neurons that have bipolar dendrites (bd neurons); 3) neurons that arborize around particular tracheal branches (td neurons). The thoracic hemisegment (T2 and T3) contains 13 da, one bd, one td, 21 es and four ch neurons; the abdominal hemisegment (A1 to A7) contains 14 da, three bd, three td, 15 es and eight ch neurons. The arrangement of the segmented peripheral neurons is highly invariant and provides a favorable assay system for the genetic analysis of neurodevelopment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00402027
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  • 18
    Electronic Resource
    Electronic Resource
    Alterations in the cell surface proteins of Drosophila during morphogenesis (1987)
    Springer
    Development genes and evolution 196 (1987), S. 339-346 
    Details
    ISSN: 1432-041X
    Keywords: Imaginal disc ; Evagination ; Surface peptides ; Radiolabeling ; Hormone depending ; Drosophila
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Unevaginated and evaginated Drosophila imaginal discs were surface-labeled with 125I. Relative labeling was greater in eleven peptides and lower in three peptides of evaginated discs compared to unevaginated discs. These results are compared to the effects of 20-hydroxyecdysone (20-HOE) on metabolic labeling of membrane proteins fractionated from imaginal discs, and on cell surface labeling of a hormone-responsive Drosophila tissue culture line. A group of 35S-methionine labeled membrane fraction peptides whose metabolic labeling is 20-HOE dependent have isoelectric points and apparent molecular weights very similar to those of a group of proteins only labeled in iodinated evaginated discs, supporting the conclusion that these are hormone-dependent, cell surface proteins (Rickoll and Fristrom 1983). Based upon two-dimensional gel electrophoretic and immunological criteria three of the proteins showing increased labeling in evaginated discs are related to three proteins induced by 20-HOE in tissue culture cells. Two different subsets of radiolabeled peptides were observed in the imaginal discs based upon detergent solubility. Some of the proteins which are soluble in NP-40 plus urea but insoluble in NP-40 alone may be localized in the basal lamina of the imaginal discs, a structure which labels heavily with 125I and is lacking in tissue culture cells. In discs, the majority of hormone-dependent changes in radiolabeled peptides were seen in the fraction solubilized by NP-40 and urea with a sulfhydryl reducing agent, while in tissue culture cells, the majority of differences is seen in the fraction solubilized by NP-40 only. We speculate that these proteins may be involved in similar processes, e.g., cell rearrangement, that occur during both disc morphogenesis and 20-HOE induced aggregation in tissue culture cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00375770
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  • 19
    Electronic Resource
    Electronic Resource
    Torus shaped bands at the 2R telomere region and at the region 68 of the salivary gland chromosomes ofDrosophila auraria (1985)
    Springer
    Cellular and molecular life sciences 41 (1985), S. 1467-1468 
    Details
    ISSN: 1420-9071
    Keywords: Toroidal bands ; Drosophila ; polytene chromosomes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The telomere of the 2R arm of the salivary gland chromosomes ofD. auraria exhibits a definite toroidal structure in routine squashed preparations, stained either by propionic orcein-carmine or by fluorescent dyes. There is evidence that a band (or bands) of region 68 (possibly homologous to that ofD. melanogaster) of the 3L chromosome arm also exhibits a toroidal structure. These toroids are associated with heterochromatin, but it is not certain that they are themselves heterochromatic.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01950040
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  • 20
    Electronic Resource
    Electronic Resource
    Dominance for enzyme activity inDrosophila melanogaster (1986)
    Springer
    Cellular and molecular life sciences 42 (1986), S. 191-192 
    Details
    ISSN: 1420-9071
    Keywords: Drosophila ; enzyme ; sn-glycerol-3-phosphate ; dehydrogenase ; dominance ; trans, regulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A regulatory element tightly linked to theGpdh locus inDrosophila melanogaster has been isolated from a natural population. Flies homozygous for second chromosomes bearing the element,H31, have half the GPDH activity of normal homozygotes. Heterozygotes betweenH31 andF orS alleles exhibit dominance in GPDH activity. Heterozygotes betweenH31, F orS andDf(2L) GdhA have half the diploid level. The contribution of theS allele to the activity inS/H31 heterozygotes is more than four times that ofH31. The regulatory element distinguishingH31 is tightly linked to theGpdh + locus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01952463
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