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| Paranotal lobe hypothesis | 2 days ago · TARGETS OF ACTIVITY. Table of contents. Targets of DPP in dorsal closure. The pannier gene of Drosophila encodes a zinc-finger transcription factor of the GATA family and is involved in several developmental processes during embryonic and imaginal development. Novel aspects of the regulation and function of pnr during embryogenesis are reported in this study. 12 hours ago · REGULATION. Targets of Activity. Although there is a single EGF receptor in Drosophila, multiple ligands activate it. This work explores the role of two ligands, Spitz and Vein, in the embryonic ventral ectoderm. 2 days ago · TARGETS OF ACTIVITY. Table of contents. Targets of DPP in dorsal closure. The pannier gene of Drosophila encodes a zinc-finger transcription factor of the GATA family and is involved in several developmental processes during embryonic and imaginal development. Novel aspects of the regulation and function of pnr during embryogenesis are reported in this study. |
| Paranotal lobe hypothesis | 2 days ago · TARGETS OF ACTIVITY. Table of contents. Targets of DPP in dorsal closure. The pannier gene of Drosophila encodes a zinc-finger transcription factor of the GATA family and is involved in several developmental processes during embryonic and imaginal development. Novel aspects of the regulation and function of pnr during embryogenesis are reported in this study. 1 hour ago · Two main hypotheses have been proposed for the origin of the insect wing: the paranotal hypothesis, which suggests that wings evolved as an extension of the dorsal thorax, and the gill-exite hypothesis, which proposes that wings were derived from a modification of a pre-existing branch at the dorsal base (subcoxa) of the leg. 2 days ago · Two main hypotheses have been proposed for the origin of the insect wing: the paranotal hypothesis, which suggests that wings evolved as an extension of the dorsal thorax, and the gill-exite hypothesis, which proposes that wings were derived from a modification of a pre-existing branch at the dorsal base (subcoxa) of the leg. |
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Insect - Wikipedia audio article paranotal lobe hypothesis.
Expression of the Drosophila homeobox gene, Distal-less supports an ancestral role in neural development.
Dev Dyn [Epub ahead of print]. PubMed ID: Summary : Distal-less Dll encodes a homeodomain transcription factor expressed in developing appendages of organisms throughout metazoan phylogeny. Based on earlier observations in the limbless nematode Caenorhabditis elegans and the primitive paranotal lobe hypothesis amphioxus, it was proposed that Dll has an ancestral function in nervous system development. Consistent with this hypothesis, Dll is necessary for the development of both peripheral and central components of the Drosophila olfactory system.
Furthermore, vertebrate homologs of Dllthe Dlx genes, play critical roles in mammalian brain development. In adult flies, Dll expression is expressed in the optic lobes, central brain regions and the antennal lobes. Characterization of Dll paranogal in the developing read article system supports a role of Dll in neural development and function and establishes an important paranotal lobe hypothesis for determining the specific functional hyoothesis of Dll in Drosophila development and for comparative studies of Drosophila Dll functions with those of its vertebrate counterparts.
Ku, H. Notch-dependent epithelial fold determines boundary formation between developmental fields in the Drosophila antenna. PLoS Genet 13 7 : e PubMed ID: Summary : Compartment boundary formation plays an important role in development by separating adjacent developmental fields. Drosophila imaginal discs have proven valuable for studying the mechanisms of boundary formation. This study examined the boundary separating the proximal A1 segment and the distal segments, defined respectively by Lim1 and Dll expression in the eye-antenna disc.
By repressing paranotal lobe hypothesis miRNA and elevating the actin regulator EnabledNotch signaling then induces actomyosin-dependent apical constriction and epithelial fold.
Disruption of Notch signaling or the actomyosin network reduces apical constriction and epithelial fold, so that Dll and Lim1 cells become intermingled. These results demonstrate a new mechanism of boundary formation by actomyosin-dependent tissue folding, which provides a physical barrier to prevent mixing of cells from adjacent developmental fields.
Requena, D. Origins and Specification of the Drosophila Wing. Curr Biol 27 24 : Paranotal lobe hypothesis ID: Summary : Two main hypotheses have been proposed read more the origin of the insect wing paranogal the paranotal hypothesis, which suggests that wings evolved as an extension of the dorsal thorax, and the gill-exite hypothesis, which proposes that wings were derived from a modification of a pre-existing branch at the dorsal base subcoxa of the leg.
This study addresses this question by studying how wing fates are initially specified during Drosophila embryogenesis, by characterizing a cis-regulatory module CRM from the snail sna gene, sna-DP for dorsal primordia.
The inputs that activate sna-DP are distinct from those that activate Distallessa marker for leg fates. Further, in genetic backgrounds in which the leg primordia are here, the DP are still partially specified. However, lineage-tracing experiments demonstrate that cells from the early leg primordia paranotal lobe hypothesis to both ventral and dorsal appendage fates.
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Together, these results suggest that the wings of Drosophila have a dual developmental origin: two groups of cells, one ventral and one more dorsal, give rise to the mature wing. It is suggested that the dual developmental origins of the wing may be a molecular remnant of the evolutionary history of this appendage, in which cells of the subcoxa of the leg coalesced with dorsal outgrowths to paranotal lobe hypothesis a dorsal paranotal lobe hypothesis with motor control.
Eksi, S. A Distalless-responsive enhancer of the Hox gene Sex combs reduced is required for segment- and sex-specific sensory organ development in Drosophila. PLoS Genet 14 4 : e PubMed ID: Summary : Hox genes are involved in the patterning of animal paranotal lobe hypothesis parts at multiple levels of regulatory hierarchies. However, Hox gene function is also required later in development for the patterning and morphogenesis of limbs and other organs. In Drosophila, spatiotemporal modulation of Sex combs reduced Scr expression within the first thoracic T1 leg underlies the generation of segment- and sex-specific remarkable, covance mail site organ patterns. High Scr expression in defined domains of the T1 leg is required for the development of T1-specific transverse bristle rows in both sexes and sex combs in males, implying that the patterning of segment-specific sense organs involves incorporation of Scr into the leg development and sex determination gene networks.]
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