FB2026_01 , released March 12, 2026
FB2026_01 , released March 12, 2026
Allele: Dmel\if3
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General Information
Symbol
Dmel\if3
Species
D. melanogaster
Name
FlyBase ID
FBal0005580
Feature type
allele
Associated gene
Associated Insertion(s)
Carried in Construct
Key Links
Allele class
Mutagen
Nature of the Allele
Allele class
Progenitor genotype
Cytology
Description
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
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

Mutants have a blistered wing phenotype.

33.7 +/- 2.5% of if3/Y flies have wing blisters.

At 22[o]C, mutant males show no defects in rotation of the genitalia.

17% of hemizygous males show wing blistering.

28% of if3/Y flies have blistered wings.

if3/Y flies have a low frequency of wing blisters (=<10%).

Hemizygotes exhibit a large centrally positioned bubble in one or both wings.

48% of hemizygous males have wing blisters at 25oC, 4% have wing blisters at 28oC.

Wing blister phenotype is dominantly enhanced by bs mutations. Enhances the blister but not vein phenotype of bs mutations.

33 to 66% of homozygotes show wing blistering.

if3/if3 flies show reduced levels of PS2 integrin on the surfaces of some imaginal disc cells (especially in the ventral region), but levels of this integrin in muscle, salivary glands and most other tissues seem to be normal. Penetrance is reduced in if3/ifk27e flies by low temperature and crowding.

Small blisters on the wing surface, centered on the anterior crossvein. Heterozygotes with ifk27e exhibit a much higher frequency of blistering.

Phenotype resembles if1 and if2.

Resembles if1. Longitudinal veins thickened, especially at wing base. Anterior crossvein thickened. Adult wings typically show large round wing blisters, but the penetrance of this phenotype in homo- and hemizygotes is variable. if3/ifk27e flies show an increase in penetrance (from 15-20% in homozygotes to 60-70% in the heteroalleles).

External Data
Interactions
Show genetic interaction network for Enhancers & Suppressors
Phenotypic Class
Enhanced by
Statement
Reference

if3 has visible phenotype, enhanceable by Tsp74F[+]/Tsp74F1, Tsp66E2/Tsp66E2

if3 has visible phenotype, enhanceable by mtmΔ77/mtm[+]

if3 has visible | recessive phenotype, enhanceable by Pgant3m1/pgant3[+]

if3 has visible | recessive phenotype, enhanceable by pgant3[+]/Pgant3m2

if3 has visible phenotype, enhanceable by by2/by[+]

if3 has visible | recessive phenotype, enhanceable by puri[+]/puriV15

if3 has visible | recessive phenotype, enhanceable by puri[+]/puriV4

if3 has visible | recessive phenotype, enhanceable by how[+]/howT1

if3 has visible | recessive phenotype, enhanceable by how[+]/howT90

if3 has visible | recessive phenotype, enhanceable by cassE48/cass[+]

if3 has visible | recessive phenotype, enhanceable by blo[+]/bloV134

if3 has visible | recessive phenotype, enhanceable by bsV100/bs[+]

if3 has visible | recessive phenotype, enhanceable by bs[+]/bsV121

if3 has visible | recessive phenotype, enhanceable by moa[+]/jbugV50

if3 has visible phenotype, enhanceable by bs[+]/bs2

Suppressed by
Statement
Reference

if3 has visible phenotype, suppressible by sli2/sli[+]

if3 has visible phenotype, suppressible by px[+]/px1

NOT Enhancer of
Statement
Reference

if[+]/if3 is a non-enhancer of visible | dominant phenotype of sogEP7

if[+]/if3 is a non-enhancer of visible | dominant phenotype of sogEP11

NOT Suppressor of
Statement
Reference

if[+]/if3 is a non-suppressor of visible | dominant phenotype of sogEP11

if[+]/if3 is a non-suppressor of visible | dominant phenotype of sogEP7

Phenotype Manifest In
Enhanced by
Statement
Reference

if3 has wing phenotype, enhanceable by Tsp74F[+]/Tsp74F1, Tsp66E2/Tsp66E2

if3 has wing phenotype, enhanceable by mtmΔ77/mtm[+]

if3 has wing blade phenotype, enhanceable by Pgant3m1/pgant3[+]

if3 has wing blade phenotype, enhanceable by pgant3[+]/Pgant3m2

if3 has wing phenotype, enhanceable by by2/by[+]

if3 has phenotype, enhanceable by crol3ex5

if3 has wing phenotype, enhanceable by EcRC300Y

if3 has wing phenotype, enhanceable by EcRM554fs

if3 has wing phenotype, enhanceable by crol04418

if3 has wing phenotype, enhanceable by crol06470

if3 has wing phenotype, enhanceable by crolk08217

if3 has phenotype, enhanceable by e(if)11

if3 has wing phenotype, enhanceable by puri[+]/puriV15

if3 has wing phenotype, enhanceable by puri[+]/puriV4

if3 has wing phenotype, enhanceable by how[+]/howT1

if3 has wing phenotype, enhanceable by cassE48/cass[+]

if3 has wing phenotype, enhanceable by howT90

if3 has wing phenotype, enhanceable by blo[+]/bloV134

if3 has wing phenotype, enhanceable by bsV100/bs[+]

if3 has wing phenotype, enhanceable by bs[+]/bsV121

if3 has wing phenotype, enhanceable by moa[+]/jbugV50

if3 has wing phenotype, enhanceable by RpL19P

if3 has wing phenotype, enhanceable by Df(2R)ES1

if3 has wing phenotype, enhanceable by Df(2R)M60E

if3 has wing phenotype, enhanceable by RpL19ex16

if3 has wing phenotype, enhanceable by RpL19ex51

if3 has wing phenotype, enhanceable by bs[+]/bs2

if3 has wing phenotype, enhanceable by mys8

NOT Enhanced by
Statement
Reference

if3 has wing phenotype, non-enhanceable by aukV106/auk[+]

if3 has wing phenotype, non-enhanceable by auk[+]/aukV162

if3 has wing phenotype, non-enhanceable by bloV99/blo[+]

if3 has wing phenotype, non-enhanceable by cassE44/cass[+]

if3 has wing phenotype, non-enhanceable by shotV104/shot[+]

if3 has wing phenotype, non-enhanceable by shot[+]/shotV167

if3 has wing phenotype, non-enhanceable by jbugV88/moa[+]

if3 has wing phenotype, non-enhanceable by pyg[+]/pygE16

if3 has wing phenotype, non-enhanceable by pygE50/pyg[+]

if3 has wing phenotype, non-enhanceable by tak[+]/takV27

if3 has wing phenotype, non-enhanceable by takV42/tak[+]

if3/ifB4 has wing phenotype, non-enhanceable by pot[+]/potP3

Suppressed by
Statement
Reference

if3 has wing phenotype, suppressible by Scer\GAL4da.G32/Tsp66EUAS.Tag:HA

if3 has wing phenotype, suppressible by sli2/sli[+]

if3 has wing phenotype, suppressible by px[+]/px1

NOT suppressed by
Statement
Reference

if3 has phenotype, non-suppressible by su(Hw)2

Enhancer of
Statement
Reference

if3 is an enhancer of egg | maternal effect phenotype of Tsp66E2

if3 is an enhancer of wing phenotype of mys8

NOT Enhancer of
Statement
Reference

if[+]/if3 is a non-enhancer of wing vein phenotype of sogEP7

if[+]/if3 is a non-enhancer of wing vein phenotype of sogEP11

NOT Suppressor of
Statement
Reference

if[+]/if3 is a non-suppressor of wing vein phenotype of sogEP11

if[+]/if3 is a non-suppressor of wing vein phenotype of sogEP7

Other
Additional Comments
Genetic Interactions
Statement
Reference

if3 enhances the short-egg phenotype seen in eggs laid by Tsp66E2 females.

The penetrance of the if3 wing blister phenotype is enhanced if the flies also carry Tsp66E2/Tsp66E2 Tsp74F1.

Expression of Tsp66EScer\UAS.T:Ivir\HA1 under the control of Scer\GAL4da.G32 dramatically reduces the if3 wing blister phenotype.

mtmΔ77/+ increases the penetrance of the wing blister phenotype seen in if3/Y flies from 33.7 +/- 2.5% to 65.4 +/- 4.7%.

100% of mysb13 if3 double mutant males have under-rotated genitalia at 22[o]C, with 61% of them being greater than 180[o] under-rotated.

Approximately 27% of if3; p130CAS1 double homozygous mutants and 25% of if3/if3; p130CAS1/+ mutants emerge as adults with significantly exacerbated wing blistering defects.

The penetrance of the wing blistering phenotype seen in if3/Y flies (17%) is increased if they are also heterozygous for either pgant3m1 (76% penetrance) or for pgant3m2 (52% penetrance).

70% of if3/Y ; by2/+ flies have blistered wings. 100% of if3/Y ; by2/by2 flies have blistered wings.

The addition of crol04418, crol06470 or crolk08217 enhances the wing blistering phenotype of if3/Y flies by 3-4 fold in the case of crol04418 and crol06470 and about 7 fold in the case of crolk08217. The addition of crol3ex5 enhances the wing blistering phenotype of if3/Y flies by about two-fold. This is significantly less than the enhancement seen by crolk08217. The addition of EcRC300Y or EcRM554fs enhances the wing blistering phenotype of if3/Y flies by about five or nine-fold respectively.

The frequency of wing blisters in if3 hemizygotes is dominantly enhanced by bsV100, bsV121, puriV4, puriV15, howT1, howT90, cassE48, bloV134 or moaV50. The frequency of wing blisters in if3 hemizygotes is not dominantly enhanced by pygE16, pygE50, shotV104, shotV167, takV27, takV42, aukV106, aukV162, cassE44, bloV99 or moaV88. The frequency of wing blisters seen in if3/ifB4 flies is not dominantly enhanced by potP3.

Double mutants with mys8 have wing blister phenotype.

The frequency of wing blistering in if3 flies is enhanced by one copy of RpL19P, Df(2R)ES1 or Df(2R)M60E. The wing blistering phenotype is also enhanced by RpL19ex16 and RpL19ex51.

The wing blister phenotype of if3 flies is dominantly enhanced by bs2 and dominantly suppressed by sli2 and by px1.

Double hemizygous and homozygous mutants with mys8 display an extreme wing phenotype, wings are folded and unexpanded, veins and aberrant crossveins can be seen.

Xenogenetic Interactions
Statement
Reference

Expression of Hsap\CD82Scer\UAS.T:Ivir\HA1 under the control of Scer\GAL4da.G32 dramatically reduces the if3 wing blister phenotype.

Complementation and Rescue Data
Images (0)
Mutant
Wild-type
Stocks (2)
Notes on Origin
Discoverer

Curry, Feb. 1938.

Curry, Feb. 1938

Arose in: wt ptg1 stock.

Comments
Comments

Class IV mutation.

Altered expression of PS2α protein.

External Crossreferences and Linkouts ( 0 )
Synonyms and Secondary IDs (1)
References (28)