FB2026_01 , released March 12, 2026
FB2026_01 , released March 12, 2026
Allele: Dmel\iavhypoB-1
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General Information
Symbol
Dmel\iavhypoB-1
Species
D. melanogaster
Name
FlyBase ID
FBal0092956
Feature type
allele
Associated gene
Associated Insertion(s)
Carried in Construct
Also Known As
iav1, hypoactive-B1, iav2, hypo B1
Key Links
Genomic Maps

Nature of the Allele
Progenitor genotype
Cytology
Description

Nucleotide substitution: C908T.

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

C6815283T

Reported nucleotide change:

C908T

Amino acid change:

P303L | iav-PA

Comment:

Location of mutation reported as C908T, which was interpreted as the location in the CDS.

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
References
Modifiers Based on Experimental Evidence ( 0 )
Disease
Interaction
References
Comments on Models/Modifiers Based on Experimental Evidence ( 0 )
 
Disease-implicated variant(s)
 
Phenotypic Data
Phenotypic Class
Phenotype Manifest In
Detailed Description
Statement
Reference

Mutant flies show a severe defect in negative geotaxis.

Mutant flies show significantly reduced speed and precision of movements during walking compared to controls. They have a reduced ability to successfully traverse gaps compared to wild type, even at short gap distances of 2.5mm.

Mutant larvae show a normal behavioural response to gentle touch.

Cho neurons in mutant larvae exhibit a lower spontaneous firing rate and no increase in action potential firing in response to sound. Ca[2+] imaging also reveals no response of mutant Cho neurons to sound.

Mutant flies exhibit the wild type avoidance of aristolochic acid in food choice assays.

Mutant adults show normal avoidance of 1% citronellal in a direct airborne repellent test (DART) assay.

Mutant larvae move more slowly than wild-type larvae at both 14[o] and 17.5[o]C.

The normal preference of third instar larvae for 17.5[o]C over 14[o]C in a two-way choice test is eliminated in mutant larvae. This elimination of the preference for 17.5[o]C is seen regardless of the release site of the larvae (either in the middle of the plate at the boundary between the two temperature zones or at either end of the plate at the extreme end of either temperature zone). In contrast to wild type, in mutant larvae, the total number of turns and the average turning angles do not increase at 14[o]C. At 17.5[o]C, the mutant larvae show average turning angles similar to that of wild type.

The ability of mutant larvae to discriminate between 17.5[o] and 16[o]C and to discriminate between 14.5[o] and 16[o]C is eliminated, but they show normal preference for 17.5[o] over 12[o]C. The mutant larvae aso show normal selection of 17.5[o] over either 22 or 24[o]C.

The normal preference of third instar larvae for 17.5[o]C over 14[o]C in a two-way choice test is eliminated in iavhypoB-1/Df(1)pod1Δ17 larvae.

Mutants retain a preference for 18[o]C (i.e. are thermotactic).

The toxicity of cinnamic alcohol, eugenol, trans-anethole and 2-phenyethyl propionate is remarkably increased in mutants compared to wild type, although the toxicity of p-cymene, methyl salicylate and geraniol is not altered in mutants compared to wild type.

The survival of 1 day old mutant males and females is significantly decreased compared to wild-type flies when they are exposed to 4 hours heat stress (38oC). 6 day old mutant females also show reduced survival under these conditions. Under normal conditions mutant flies have close to wild-type fertility. If the flies are subjected to heat stress on day 8 after eclosion, mutant flies show a drop in fertility on the day of the stress which returns to control levels on the following day, while wild-type flies show a drop in fertility virtually to zero on the day of the stress and this low level is seen for 3 consecutive days.

Mutant females are susceptible to p-Cresol.

Open-field activity tests of mutant adults showed reduced speed as well as amount of locomotion (the former meaning number of squares in the activity chambered visited/unit time, the latter the proportion of time spent moving); male activity levels higher than for females (also found for wild-type).

External Data
Interactions
Show genetic interaction network for Enhancers & Suppressors
Phenotypic Class
NOT Enhanced by
Suppressed by
NOT suppressed by
NOT Enhancer of
NOT Suppressor of
Phenotype Manifest In
NOT Enhanced by
Suppressed by
Statement
Reference
NOT suppressed by
NOT Enhancer of
NOT Suppressor of
Additional Comments
Genetic Interactions
Statement
Reference
Xenogenetic Interactions
Statement
Reference
Complementation and Rescue Data
Comments

Expression of iavScer\UAS.cKa under the control of one of Scer\GAL4iav.PK, Scer\GAL4pain-GAL4 or Scer\GAL4nan.PK rescues the deficit in cool temperature discrimination (distinguishing between 17.5[o] and 14[o]C) of iavhypoB-1 larvae.

Images (0)
Mutant
Wild-type
Stocks (1)
Notes on Origin
Discoverer
External Crossreferences and Linkouts ( 0 )
Synonyms and Secondary IDs (9)
References (26)