A Database of Drosophila Genes & Genomes

FB2013_03, released May 7th, 2013
 

Allele Dmel\InRex15

General Information
SymbolDmel\InRex15SpeciesD. melanogaster
NameFlyBase IDFBal0147836
Feature typealleleAssociated geneDmel\InR
Also Known Asdinrex15
Allele class
Mutagen
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Description
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FB2013_03
FB2013_02
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Allele class
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Cytology
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Single photoreceptors mutant for InR[ex15] survive, but axons have an altered morphology and the axonal process is very thin compared with wild type axons. All analysed R8 photoreceptors correctly target the M3 layer.
InRex15 mutants show no defects in opsin regulation.
In mosaic larvae in which homozygous clones have been induced in the eye, photoreceptor cell axons project normally through the optic stalk but fail to target the optic lobe properly. The axons cross and terminate prematurely, resulting in gaps and densely packed regions in the lamina. In the medulla, projections fail to form the staggered projections seen in the wild type and the growth cones terminate in thick blunt ends. The pattern of R7 and R8 projections in the medulla shows defects in mosaic adults in which homozygous clones have been induced in the eye; crossing of fibres and gaps in the R7 layer are seen. Heterozygotes have normal photoreceptor cell projections in the medulla.
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One copy of InR[ex15] suppresses the R8 photoreceptor phenotype seen when gogo[Scer\UAS.T1] is expressed under the control of Scer\GAL4[GMR.PF]. 12% of R8 axons form blob-like structures at the M1 layer.
dock04723/+ ; InRex15/+ double heterozygotes show defects in photoreceptor axon projections in the medulla; gaps in the R7 terminal array and uninnervated areas are seen. These defects are seen in larvae and adults. dock13421/+ ; InRex15/+ double heterozygotes show defects in photoreceptor axon projections in the medulla; gaps in the R7 terminal array and uninnervated areas are seen. These defects are seen in larvae and adults. No obvious defects in photoreceptor axon projections in the medulla are seen in chico1/+ ; InRex15/+ double heterozygous adults.
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Research paper
Mann et al., 2012, Development 139(4): 760--771
A putative tyrosine phosphorylation site of the cell surface receptor Golden goal is involved in synaptic layer selection in the visual system. [FBrf0217291]
Yu et al., 2009, Development 136(9): 1497--1507
Dicer-1-dependent Dacapo suppression acts downstream of Insulin receptor in regulating cell division of Drosophila germline stem cells. [FBrf0207811]
Mikeladze-Dvali et al., 2005, Cell 122(5): 775--787
The growth regulators warts/lats and melted interact in a bistable loop to specify opposite fates in Drosophila R8 photoreceptors. [FBrf0187233]
Song et al., 2003, Science 300(5618): 502--505
Axons guided by insulin receptor in Drosophila visual system. [FBrf0159327]