FB2024_03 , released June 25, 2024
Allele: Dmel\hiwΔN
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General Information
Symbol
Dmel\hiwΔN
Species
D. melanogaster
Name
FlyBase ID
FBal0296663
Feature type
allele
Associated gene
Associated Insertion(s)
Carried in Construct
Key Links
Allele class
Nature of the Allele
Allele class
Progenitor genotype
Cytology
Description

The N-terminus of hiw is deleted due to imprecise excision of P{GT1}hiwBG02015, removing the genomic region encoding the first 2784 amino acids of hiw.

Mutations Mapped to the Genome
Curation Data
Type
Location
Additional Notes
References
Variant Molecular Consequences
Associated Sequence Data
DNA sequence
Protein sequence
 
Expression Data
Reporter Expression
Additional Information
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Marker for
Reflects expression of
Reporter construct used in assay
Human Disease Associations
Disease Ontology (DO) Annotations
Models Based on Experimental Evidence ( 1 )
Disease
Evidence
References
Modifiers Based on Experimental Evidence ( 1 )
Disease
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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

hiwΔN third instar larvae exhibit dramatic overgrowth of the neuromuscular junction, namely increased branching and increased number of presynaptic boutons, as compared to controls.

hiwΔN mutants show defective injury-induced axon degeneration as the severed axons persist rather than be cleared away. Moreover, after an axotomy of mechanosensory neurons in the Johnston's organ, the persisting severed axons can still elicit grooming behavior upon optogenetic stimulation of the neurons.

Mutant larvae show a dramatic increase in the number of boutons at the neuromuscular junction compared to wild type.

Mutant larvae show a decrease in axonal degeneration after crush injury compared to wild type.

hiw052/hiwΔN has a strong protective effect on L1 vein neurons following axotomy. Whereas wild type axons undergo fragmentation, many severed but intact axons are observed. A similar protective effect is seen in axotomised olfactory receptor neurons.

Loss of hiw in hiwΔNterm mutants causes dramatic presynaptic overgrowth and ectopic synapses in C4 da neurons.

Mutant larvae show an increase in both branch and bouton number at the neuromuscular junction compared to controls.

hiwΔN mutants display significantly enhanced aversive long term memory after one-session or two-session spaced training, but show normal long term memory after ten-session spaced training. Sensorimotor abilities are unchanged compared with controls.

hiwΔN mutants exhibit dramatic synaptic overgrowth yet reduced quantal content.

hiwΔN mutant neuromuscular junctions exhibit a decrease in bouton size compared to wild-type and a concurrent increase in the number of boutons (compared to wild-type).

Axonal sprouting of the injured axon after a crush injury to the segmental nerve in third instar larvae is accelerated approximately 5 hours in mutant animals compared to controls.

Morphological analysis at the neuromuscular junction of hiwΔNterm mutants reveals a dramatic synaptic overgrowth phenotype apparent at every type I synapse.

Using the MN4-Ib motoneuron as a model, hiwΔNterm mutants exhibit a fivefold increase in the numbers of both synaptic bouton and branch points when compared with wild-type neuromuscular junctions. The synaptic span is also incrase from approximately 15% in wild-type to approximately 40%. Although there is an increase in the number of synaptic boutons, there is an approximate 70% decrease in the average bouton size compared to wild-type.

External Data
Interactions
Show genetic interaction network for Enhancers & Suppressors
Phenotypic Class
Suppressed by
Statement
Reference
Suppressor of
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Reference
NOT Suppressor of
Phenotype Manifest In
Suppressed by
NOT suppressed by
Suppressor of
Statement
Reference

hiwΔN is a suppressor | partially of axon | third instar larval stage | conditional phenotype of rawdcp-1

NOT Suppressor of
Additional Comments
Genetic Interactions
Statement
Reference

rawdcp-1 homozygotes show protection against (injury-induced) Wallerian degeneration in third instar larval motor neurons, which is considerably suppressed by hiwΔN.

MARCM clones in sensory neurons in the adult wing expressing Ect4ΔARM.Scer\UAS.T:Hsap\MYC driven by Scer\GAL4VGlut-OK371 undergo spontaneous cell body and axon degeneration which cannot be suppressed by combination hiwΔN.

The axon and cell body degeneration in sensory neuron clones in the adult wing expressing NmnatGD8082 under the control of Scer\GAL4VGlut-OK371 is only marginally improved by hiwΔN.

The dramatic overgrowth of presynaptic arbors found in hiwΔNterm mutant C4 da neurons is completely abolished in a Dscam118 MARCM clone background.

The dramatic overgrowth of presynaptic arbors found in hiwΔNterm mutant C4 da neurons is completely abolished by expression of Fmr1Scer\UAS.cZa under the control of Scer\GAL4ppk.PG.

Aplip1ex suppresses the increase in branch and bouton number at the neuromuscular junction which is seen in hiwΔNterm larvae. hiwΔNterm suppresses the increase in maximum bouton diameter which is seen at the neuromuscular junction in Aplip1ex larvae.

Presynaptic expression of Rae1Scer\UAS.T:Zzzz\TAP under the control of Scer\GAL4elav-C155 fails to rescue the bouton number increase found in hiwΔN mutant synapses.

Xenogenetic Interactions
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Complementation and Rescue Data
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Mutant
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Stocks (1)
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External Crossreferences and Linkouts ( 0 )
Synonyms and Secondary IDs (4)
References (23)