Imaginal Disks

2013 ◽  
pp. 19-23
Author(s):  
J.F. de Celis ◽  
A. García-Bellido
Keyword(s):  
Imaginal Disks

Cell Death During the Development of the Imaginal Disks of Calliphora Erythrocephala

1970 ◽  
Vol 21 (3) ◽  
pp. 221-265 ◽  
Author(s):  
Th E. Spreij
Keyword(s):  
Cell Death ◽  
Calliphora Erythrocephala ◽  
Imaginal Disks

Alternative RNA splicing that is spatially regulated: generation of transcripts from the Antennapedia gene of Drosophila melanogaster with different protein-coding regions

1988 ◽  
Vol 8 (10) ◽  
pp. 4143-4154
Author(s):  
V L Stroeher ◽  
J C Gaiser ◽  
R L Garber
Keyword(s):  
Alternative Splicing ◽  
Rna Splicing ◽  
Developmental Stages ◽  
Molecular Evidence ◽  
Rnase Protection ◽  
Protein Coding ◽  
Spatial Regulation ◽  
Coding Regions ◽  
Imaginal Disks ◽  
Isolated Tissues

We have shown previously that transcription of the Drosophila homeotic gene Antennapedia results in four major RNA species which differ in long 5'- and 3'-untranslated sequences. The protein-coding portion of these transcripts, however, is located in exons common to all. Using RNase protection assays and further cDNA clone isolation, we have now detected two alternative splicing events between exons of this region. These result in four RNA variations which, if translated, would encode a family of Antennapedia proteins. By analyzing transcripts from various developmental stages and isolated tissues, we show that alternative splicing is under strict temporal and spatial regulation. For example, while similar patterns of splicing were found for all wild-type thoracic imaginal disks examined, these differed distinctly from the patterns observed in neural tissues. Our results suggest that individual RNAs may be associated with different biological roles, and provide molecular evidence that the Antennapedia gene is involved in multiple functions.

Imaginal Disks

2012 ◽  
Keyword(s):  
Imaginal Disks

Determination and transdetermination in imaginal disks of Drosophila (Summary only)

1970 ◽  
Vol 176 (1044) ◽  
pp. 291-293
Keyword(s):  
Single Cells ◽  
Body Part ◽  
Cell Types ◽  
Structural Features ◽  
Theoretical Concept ◽  
Body Cavity ◽  
The Body ◽  
Body Region ◽  
Body Parts ◽  
Imaginal Disks

It is generally assumed that in multicellular organisms the diversity of the different cell types is the result of different gene activity which becomes manifest in the course of development. This theoretical concept of cell differentiation was developed on the basis of results obtained from a relatively small number of suitable experimental systems. One of them comprises the imaginal disks of the fruitfly Drosophila melanogaster . Imaginal disks are larval primordia in holometabolic insects such as flies and mosquitoes, and consist of densely packed populations of morphologically uniform cells. They give rise to defined structures of the adult body (mainly integument), thus replacing parts of the larva which are almost completely histolysed during metamorphosis. The prospective fate of the various imaginal disks can be tested, for example, by transplantation experiments. Individual disks are removed from larvae of a genetically marked strain and transplanted into the body cavity of another larva with which the transplants undergo metamorphosis. The metamorphosed derivatives of the disks are then found in the abdomen of the fly and can be microscopically identified on the basis of the morphology of bristles, hairs and other structural features of the integument. The same method is applied for examination of the developmental performance of disk fragments. From the results of such experiments the following conclusions are drawn: (1) Individual disks of fully grown larvae, that is larvae which are ready to pupate, are determined (programmed) for exactly defined body parts of the adult organism. (2) The individual subregions of such a body part can be localized precisely within a disk. Based on these facts fate maps (anlage plans) can be worked out. (3) From experiments in which different genetically marked disks are intermingled and then transplanted into larvae it is concluded that even single cells are determined for structures of a specific body region.

Development of Transplanted Imaginal Disks in X-irradiated Housefly Pupae

Nature ◽  
1969 ◽  
Vol 222 (5195) ◽  
pp. 786-787 ◽  
Author(s):  
G. BHASKARAN ◽  
P. SIVASUBRAMANIAN
Keyword(s):  
Imaginal Disks

scholarly journals Septate junctions in imaginal disks of Drosophila: a model for the redistribution of septa during cell rearrangement.

1982 ◽  
Vol 94 (1) ◽  
pp. 77-87 ◽  
Author(s):  
D K Fristrom
Keyword(s):  
Freeze Fracture ◽  
Septate Junction ◽  
Lateral Boundary ◽  
Progressive Change ◽  
Septate Junctions ◽  
Thin Sections ◽  
Cell Rearrangement ◽  
Imaginal Disks ◽  
Discrete Domains ◽  
Small Channels

The organization of septate junctions during morphogenesis of imaginal disks is described from freeze-fracture replicas and thin sections with a view to understanding junction modulation during rearrangements of cells in epithelia. The septate junctions of each epithelial cell of the disk are distributed in a number of discrete domains equal to the number of neighboring cells. Individual septa traverse domains of contact between pairs of adjacent cells, turn downwards at the lateral boundary of the domain and run parallel to the intersection with a third cell. This arrangement leaves small channels at three-cell intersections that are occupied by specialized structures termed "tricellular plugs." Cell rearrangement involves a progressive change in the width of contact domains between adjacent cells, until old contacts are broken and new ones established. It is proposed that the septate junction adjusts to the changing width of domains by the compaction or extension of existing septa. This redistribution of septa theoretically allows a transepithelial barrier to be maintained during cell rearrangements. The applicability of this model to other epithelial tissues is discussed.

Effects of β-ecdysone and juvenile hormone on the Na+/K+-dependent ATPase in imaginal disks of Drosophila melanogaster

1976 ◽  
Vol 22 (12) ◽  
pp. 1697-1707 ◽  
Author(s):  
James W. Fristrom ◽  
Leonard Kelly
Keyword(s):  
Drosophila Melanogaster ◽  
Juvenile Hormone ◽  
Dependent Atpase ◽  
Imaginal Disks
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