Extra DNA replication and cell proliferation in wing imaginal discs of aDrosophila species hybrid

1980 ◽  
Vol 189 (2) ◽  
pp. 83-89 ◽  
Author(s):  
Barbara Meer
Keyword(s):  
Cell Proliferation ◽  
Dna Replication ◽  
Imaginal Discs ◽  
Species Hybrid ◽  
Wing Imaginal Discs

The Serrate locus of Drosophila and its role in morphogenesis of the wing imaginal discs: control of cell proliferation

Development ◽  
1994 ◽  
Vol 120 (3) ◽  
pp. 535-544 ◽  
Author(s):  
S.A. Speicher ◽  
U. Thomas ◽  
U. Hinz ◽  
E. Knust
Keyword(s):  
Cell Proliferation ◽  
Transmembrane Protein ◽  
Ectopic Expression ◽  
Imaginal Discs ◽  
Specific Cell ◽  
Loss Of Function ◽  
Severe Reduction ◽  
Homozygous Mutant ◽  
Wing Imaginal Discs ◽  
Larval Lethality

The Drosophila gene Serrate encodes a transmembrane protein with 14 EGF-like repeats in its extracellular domain. Here we show that loss-of-function mutations in this gene lead to larval lethality. Homozygous mutant larvae fail to differentiate the anterior spiracles, exhibit poorly developed mouth-hooks and show a severe reduction in the size of the wing and haltere primordia, which is not due to cell death. The few homozygous mutant escapers that pupariate develop into pharate adults that almost completely lack wings and halteres. Clonal analysis in the adult epidermis demonstrates a requirement for Serrate during wing and haltere development. Targeted ectopic expression of Serrate in the imaginal discs using the yeast transcriptional activator Gal4 results in regionally restricted induction of cell proliferation, e.g. the ventral tissues in the case of the wings and halteres. The results suggest that the wild-type function of Serrate is required for the control of position-specific cell proliferation during development of meso- and metathoracic dorsal discs, which in turn exerts a direct effect on morphogenesis.

scholarly journals Oligomerization and endocytosis of Hedgehog is necessary for its efficient exovesicular secretion

2015 ◽  
Vol 26 (25) ◽  
pp. 4700-4717 ◽  
Author(s):  
Anup Parchure ◽  
Neha Vyas ◽  
Charles Ferguson ◽  
Robert G. Parton ◽  
Satyajit Mayor
Keyword(s):  
Cell Surface ◽  
Long Range ◽  
Imaginal Discs ◽  
Multivesicular Bodies ◽  
Selective Effect ◽  
Endosomal Sorting ◽  
Drosophila Wing ◽  
Dependent Process ◽  
Wing Imaginal Discs ◽  
Hh Signaling

Hedgehog (Hh) is a secreted morphogen involved in both short- and long-range signaling necessary for tissue patterning during development. It is unclear how this dually lipidated protein is transported over a long range in the aqueous milieu of interstitial spaces. We previously showed that the long-range signaling of Hh requires its oligomerization. Here we show that Hh is secreted in the form of exovesicles. These are derived by the endocytic delivery of cell surface Hh to multivesicular bodies (MVBs) via an endosomal sorting complex required for transport (ECSRT)–dependent process. Perturbations of ESCRT proteins have a selective effect on long-range Hh signaling in Drosophila wing imaginal discs. Of importance, oligomerization-defective Hh is inefficiently incorporated into exovesicles due to its poor endocytic delivery to MVBs. These results provide evidence that nanoscale organization of Hh regulates the secretion of Hh on ESCRT-derived exovesicles, which in turn act as a vehicle for long-range signaling.

Expanded: a gene involved in the control of cell proliferation in imaginal discs

Development ◽  
1993 ◽  
Vol 118 (4) ◽  
pp. 1291-1301 ◽  
Author(s):  
M. Boedigheimer ◽  
A. Laughon
Keyword(s):  
Cell Proliferation ◽  
Protein Interactions ◽  
Essential Gene ◽  
Spontaneous Mutation ◽  
Growth Control ◽  
Imaginal Discs ◽  
Apical Surface ◽  
Protein Protein Interactions ◽  
Acid Protein ◽  
Disc Cells

The expanded gene was first identified by a spontaneous mutation that causes broad wings. We have identified an enhancer-trap insertion within expanded and used it to generate additional mutations, including one null allele. expanded is an essential gene, necessary for proper growth control of imaginal discs and, when mutant, causes either hyperplasia or degeneration depending on the disc. Wing overgrowth in expanded hypermorphs is limited to specific regions along the anterior-posterior and dorsal-ventral axis. expanded encodes a novel 1429 amino acid protein that is localized to the apical surface of disc cells and contains three potential SH3-binding sites. Together, these observations suggest that the Expanded protein engages in protein-protein interactions regulating cell proliferation in discs.

Changing spatial patterns of DNA replication in the noise-damaged chick cochlea

1993 ◽  
Vol 105 (1) ◽  
pp. 23-31
Author(s):  
E. Hashino ◽  
R.J. Salvi
Keyword(s):  
Cell Proliferation ◽  
Dna Replication ◽  
Hair Cell ◽  
Temporal Pattern ◽  
Cell Loss ◽  
Basilar Papilla ◽  
Hair Cell Loss ◽  
Sensory Hair Cell ◽  
Brdu Immunohistochemistry ◽  
Spatio Temporal

The purpose of the present study was to examine the spatio-temporal pattern of cell proliferation in the chick cochlea in response to the sensory hair cell loss induced by a 1.5 kHz pure tone at 120 dB SPL (1 dB = 20 muPa) for 48 h. DNA replication was evaluated with the bromodeoxyuridine (BrdU) pulse-fix technique. One group of birds was given multiple injections of BrdU (50 mg/kg) over a period of 8 h at various starting times during or after the exposure. Afterwards, their cochleas were removed and processed as whole mounts for BrdU immunohistochemistry. The cochleas of a second group of acoustically traumatized chicks were evaluated by scanning electron microscopy in order to determine the spatio-temporal pattern of hair cell loss. Hair cell loss was first observed 12 h after the start of the exposure and DNA replication started near the inferior edge of the hair cell lesion 24–32 h after the start of the exposure, i.e. 12–20 h after the first sign of hair cell loss. The site of hair cell loss and DNA replication shifted toward the superior edge of the basilar papilla as the exposure continued. The rate of DNA replication accelerated and reached its peak near the end of the 48 h exposure. The estimated latency of cell proliferation after hair cell loss was faster and the duration of DNA replication shorter than that observed in other sensory systems. The spatio-temporal pattern of DNA replication follows the spatio-temporal gradient of hair cell loss, suggesting that cell proliferation is triggered by hair cell loss itself rather than by intrinsic positional cues or gradients.

scholarly journals Role of D-GADD45 in JNK-Dependent Apoptosis and Regeneration in Drosophila

Genes ◽  
2019 ◽  
Vol 10 (5) ◽  
pp. 378 ◽  
Author(s):  
Carlos Camilleri-Robles ◽  
Florenci Serras ◽  
Montserrat Corominas
Keyword(s):  
Cell Cycle ◽  
Cell Death ◽  
Cell Cycle Control ◽  
Imaginal Discs ◽  
Cellular Functions ◽  
Correct Function ◽  
Response To Stress ◽  
Wing Imaginal Discs ◽  
Harmful Effects

The GADD45 proteins are induced in response to stress and have been implicated in the regulation of several cellular functions, including DNA repair, cell cycle control, senescence, and apoptosis. In this study, we investigate the role of D-GADD45 during Drosophila development and regeneration of the wing imaginal discs. We find that higher expression of D-GADD45 results in JNK-dependent apoptosis, while its temporary expression does not have harmful effects. Moreover, D-GADD45 is required for proper regeneration of wing imaginal discs. Our findings demonstrate that a tight regulation of D-GADD45 levels is required for its correct function both, in development and during the stress response after cell death.

Chitin synthesis inSpodoptera frugiperda wing imaginal discs. III: Role of the peripodial membrane

1995 ◽  
Vol 28 (2) ◽  
pp. 173-187 ◽  
Author(s):  
Piotr Miko?ajczyk ◽  
Grazyna Zimowska ◽  
Herbert Oberlander ◽  
Donald L. Silhacek
Keyword(s):  
Imaginal Discs ◽  
Chitin Synthesis ◽  
Wing Imaginal Discs
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