FB2024_03 , released June 25, 2024
Allele: Dmel\Trim991
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General Information
Symbol
Dmel\Trim991
Species
D. melanogaster
Name
FlyBase ID
FBal0266852
Feature type
allele
Associated gene
Associated Insertion(s)
Carried in Construct
Also Known As
asap91
Key Links
Genomic Maps

Allele class
Nature of the Allele
Allele class
Cytology
Description

Imprecise excision of the P{GawB} element in P{GawB}Trim9NP4638 resulted in a 1.2kb deletion 8bp downstream of the insertion site. A three base insertion (CAT) remains in the deleted region.

Mutations Mapped to the Genome
Curation Data
Type
Location
Additional Notes
References
Comment:

1.2 kb deletion resulting from the imprecise excision of P{GawB}Trim9NP4638, starts 8bp from insertion site and extends into Trim9 gene. Downstream breakpoint approximate.

Variant Molecular Consequences
Associated Sequence Data
DNA sequence
Protein sequence
 
Expression Data
Reporter Expression
Additional Information
Statement
Reference
 
Marker for
Reflects expression of
Reporter construct used in assay
Human Disease Associations
Disease Ontology (DO) Annotations
Models Based on Experimental Evidence ( 0 )
Disease
Evidence
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Modifiers Based on Experimental Evidence ( 0 )
Disease
Interaction
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Comments on Models/Modifiers Based on Experimental Evidence ( 0 )
 
Disease-implicated variant(s)
 
Phenotypic Data
Phenotypic Class
Phenotype Manifest In
Detailed Description
Statement
Reference

Homozygous Trim991 third instar larvae show a marked loss of C4da commissural fascicles in the ventral nerve cord. Axonal defects are visible by embryonic stage 17.

Trim991/Df(2L)Exel8026 third instar larvae show a marked loss of C4da commissural fascicles in the ventral nerve cord. Axonal defects are visible by embryonic stage 17.

In contrast to wild type flies, almost no contralateral projections of the ddaC and vdaB axons are seen in Trim991/Df(2L)Exel8026 third instar larvae. However, the frequency of longitudinal branches is comparable to that in wild type.

3D image reconstruction shows that, as in wild type, the commissural branches in all subtypes of Trim991/Df(2L)Exel8026 C4da neurons are composed of highly branched and tangled processes. However, the wild type terminal processes are oriented almost exclusively to the medial side in all subtypes, whereas in Trim991/Df(2L)Exel8026 mutants the processes are oriented in both medial and lateral directions.

Visualisation of presynaptic terminals using Syt1Scer\UAS.T:Avic\GFP-EGFP shows that Trim991 ddaC neurons (generated using the MARCM system under the control of Scer\GAL4ppk.PG) only form synaptic connections on the ipsilateral side of the commissural branches, compared to both the ipsilateral and contralateral sides in wild type.

Homozygous Trim991 third instar larvae crawl with significantly fewer head turning behaviors compared to wild type. In addition, a concomitant increase in crawling speed is observed in Trim991 mutants.

External Data
Interactions
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Phenotypic Class
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Additional Comments
Genetic Interactions
Statement
Reference
Xenogenetic Interactions
Statement
Reference
Complementation and Rescue Data
Comments

C4da neuron-specific expression of Trim9Scer\UAS.cMa under the control of Scer\GAL4ppk.PG largely rescues the axonal defects seen in Trim991/Df(2L)Exel8026 mutants.

Expression of Trim9Scer\UAS.ΔFNIII under the control of Scer\GAL4ppk.PG is unable to rescue the axonal projection defects seen in Trim991/Df(2L)Exel8026 C4da neurons.

Expression of Trim9Scer\UAS.ΔSPRY under the control of Scer\GAL4ppk.PG is unable to rescue the axonal projection defects seen in Trim991/Df(2L)Exel8026 C4da neurons.

Expression of Trim9Scer\UAS.ΔCC under the control of Scer\GAL4ppk.PG is unable to rescue the axonal projection defects seen in Trim991/Df(2L)Exel8026 C4da neurons.

Expression of Trim9Scer\UAS.ΔBB under the control of Scer\GAL4ppk.PG partially rescues the axonal projection defects seen in Trim991/Df(2L)Exel8026 C4da neurons.

Expression of Trim9Scer\UAS.ΔRING under the control of Scer\GAL4ppk.PG partially rescues the axonal projection defects seen in Trim991/Df(2L)Exel8026 C4da neurons.

Expression of Trim9Scer\UAS.cMa under the control of Scer\GAL4ppk.PG significantly rescues the crawling behavior defects seen in Trim991 mutants.

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Synonyms and Secondary IDs (2)
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    References (2)