A Database of Drosophila Genes & Genomes

FB2013_03, released May 7th, 2013
 

Allele Dmel\ptcScer\UAS.cMa

General Information
SymbolDmel\ptcScer\UAS.cMaSpeciesD. melanogaster
NameSaccharomyces cerevisiae UAS construct of MeriandaFlyBase IDFBal0197449
Feature typealleleAssociated geneDmel\ptc
Allele class
Mutagenin vitro construct - regulatory fusion
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Description
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FB2013_03
FB2013_02
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Allele class
Mutagen
Mutations Mapped to the Genome
Type
Location
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Associated Sequence Data
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DNA sequence
Protein sequence
Name
 
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Progenitor genotype
Nature of the lesion
Statement
Reference
Scer\UAS regulatory sequences drive expression of ptc coding sequences.
Carried in construct
Cytology
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Rescues
Partially rescues
Comments
Maternally-derived expression of ptcScer\UAS.cMa under the control of Scer\GAL4arm.PS in a ptcunspecified mutant background rescues the formation of NB4-2 and specification defects in as many as 60% of hemisegments. With Fas2 staining, guidance defects were rescued in 80% of hemisegments. Staining with BP102 revealed 60% rescue of guidance defects per segment, indicating that not all of the neuroblasts that contribute to commissural tracts were rescued. When Scer\GAL4arm.PS is paternally-derived, neither the NB4-2 defects nor the medial tract guidance defects in ptcunspecified mutants are rescued. Expression of ptcScer\UAS.cMa under the control of Scer\GAL4hs.PB for 30 minutes at 37oC results in a near complete rescue of the longitudinal tracts in ptcunspecified embryos. Medial tracts are normal in 93% of hemisegments. Even when there is mis-routing of the medal tracts, only a few growth cones appear to be crossing the midline. These rescues are only observed when the ptcScer\UAS.cMa transgene is induced between 2 and 3 hours of development. No rescue is observed with the induction of ptcScer\UAS.cMa during other developmental time points. A 10 minute induction of the ptcScer\UAS.cMa transgene partially rescues the defects, whereas a 20 minute induction results in a very strong rescue. These results indicate that the presence of ptc protein in a narrow time window during the specification of neuroblast identity is sufficient to rescue the medial axon tract defects in ptcunspecified mutant embryos.
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Reported As
Symbol Synonym
ptcScer\UAS.cMa
 
Name Synonym
Saccharomyces cerevisiae UAS construct of Merianda
 
Secondary FlyBase IDs
hide References ( 1 )
Research paper
Merianda et al., 2005, Dev. Genes Evol. 215(6): 285--296
Patched regulation of axon guidance is by specifying neural identity in the Drosophila nerve cord. [FBrf0187440]