The gene inflated is referred to in FlyBase by the symbol Dmel\if (CG9623, FBgn0001250). It is a protein_coding_gene from Drosophila melanogaster. There is experimental evidence that it has the molecular function: cell adhesion molecule binding; receptor activity. There is experimental evidence for 11 unique biological process terms, many of which group under: single-organism developmental process; cellular component organization or biogenesis; biological regulation; system development; neuron differentiation; post-embryonic organ morphogenesis; system process; gland morphogenesis; open tracheal system development; muscle cell differentiation; multicellular organismal development; salivary gland morphogenesis; localization; regulation of developmental process; sensory perception of chemical stimulus; cellular process; neuron projection development. 85 alleles are reported. The phenotypes of these alleles are annotated with: organ system; hypodermal muscle of larval abdomen; ISN innervated muscle of A1-7; organ system subdivision; non-connected developing system; adult segment; portion of tissue; extended germ band embryo; abdominal 7 longitudinal muscle; embryonic foregut; endoderm derivative. It has 4 annotated transcripts and 4 annotated polypeptides. Protein features are: FG-GAP repeat; Integrin alpha beta-propellor; Integrin alpha chain; Integrin alpha chain, C-terminal cytoplasmic region, conserved site; Integrin alpha-2. Summary of modENCODE Temporal Expression Profile: Temporal profile ranges from a peak of high expression to a trough of very low expression. Peak expression observed within 12-24 hour embryonic stages. Summary of FlyAtlas Anatomical Expression Data: Many larval and adult organs/tissues expressed at moderate or high levels. Expression at high levels in the following post-embryonic organs or tissues: adult crop, larval/adult hindgut, larval Malpighian tubules, larval carcass. Expression at moderate levels in the following post-embryonic organs or tissues: adult head, larval/adult central nervous system, adult Malpighian tubules, adult heart, adult fat body, larval/adult salivary gland, larval trachea, adult spermathecae, adult carcass. Comments on Affy2 ProbeSet: ProbeSet 1632744_a_at completely aligns to an exonic region common to each of the 4 FlyBase-annotated transcript isoforms of if. Gene sequence location is X:16646222..16677467.
User Contributed Data
Phenotypic Description from the Red Book (Lindsley
& Zimm 1992)
Gene/Allele symbols may differ
from current usage
if: inflated
Structural gene for the α-subunit of position
specific integrin 2 (PS2), a large transmembrane protein
(Bogaert et al., 1987). The β-subunit can associate with
either of the two α-subunits, PS1 or PS2 (Brower et al., 1984;
Wilcox, Brown, Piovant, Smith, and White, 1984, EMBO J.
3: 2307-13). Both α and β integrin are expressed in embryonic
and larval tissues. In early development, PS2 is found in the
mesoderm, localized to muscle attachments (Bogaert et al.,
1987). Later, PS1 is expressed in the presumptive dorsal
epithelium of the third instar imaginal wing discs; also, PS2
is found in the ventral epithelium, both integrins being
important for the joining of the dorsal and ventral surfaces
of the wing blade (Brower and Jaffe, 1989). Null mutations
cause embryonic lethality (Wilcox, DiAntonio, and Leptin). In
the mutant if1, the adult wing is inflated with lymph and
smaller than normal; venation is defective. Wings later
become dry and blistered.
if3
Longitudinal veins thickened, especially at wing
base. Anterior crossvein thickened. 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 (Brower and Jaffe, 1989). 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);
penetrance is reduced in if3/ifk27e flies by low temperature
and crowding (Brower and Jaffe, 1989).
ifN
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if transcripts are expressed throughout development and in adults. In embryos, they are first detected at stage 4 in the presumptive mesoderm. They continue to be expressed in mesodermal cells after invagination. In third instar larval wing discs, if transcripts are primarily restricted to the ventral compartment and to the peripodial membrane.
if protein is first detected in stage 10 embryos in the mesoderm where it is basally concentrated in cuboidal cells which lie on the ectoderm. After the somatic and visceral mesoderm separates, if protein is found on the basal cell surfaces of the visceral myoblasts when they attach to the foregut, midgut, and hindgut. It is also found at the sites of attachment of the somatic muscles. Protein was also detected in the gonadal sheath and in the interstitial cells of the gonad In third instar larval wing discs, if protein is primarily restricted to the ventral compartment.
Summary of FlyAtlas Anatomical Expression Data: Many larval and adult organs/tissues expressed at moderate or high levels. Expression at high levels in the following post-embryonic organs or tissues: adult crop, larval/adult hindgut, larval Malpighian tubules, larval carcass. Expression at moderate levels in the following post-embryonic organs or tissues: adult head, larval/adult central nervous system, adult Malpighian tubules, adult heart, adult fat body, larval/adult salivary gland, larval trachea, adult spermathecae, adult carcass.
[download data (TSV)]
Guide to FlyAtlas expression level colors
No expression (0 - 9.999)
Low expression (10 - 99.999)
Moderate expression (100 - 499.999)
High level expression (500 - 999.999)
Very high expression (>999.999)
Linear, scaled to maximum expression level
Tissue
Expression Level
Larval Central Nervous System
145.2
Larval Midgut
85.8
Larval Hindgut
554.4
Larval Malpighian Tubules
1185.7
Larval Fat Body
23.4
Larval Salivary Gland
493.2
Larval Trachea
349.45
Larval Carcass
991.75
Adult Head
204.7
Adult Eye
68.375
Adult Brain
78.5
Adult Thoracic-Abdominal Ganglion
117.7
Adult Crop
925.1
Adult Midgut
87.8
Adult Hindgut
579.7
Adult Malpighian Tubules
300.7
Adult Fat Body
160.3
Adult Salivary Gland
183.6
Adult Heart
255.675
Adult VirginFemale Spermatheca
234.7
Adult InseminatedFemale Spermatheca
193.6
Adult Ovary
21.5
Adult Testis
34.5
Adult Male Accessory Gland
96.7
Adult Carcass
280.3
Expression Level Scale
None
Low
Moderate
High
Very high
Linear, scaled to Moderate expression
Tissue
Expression Level
Larval Central Nervous System
145.2
Larval Midgut
85.8
Larval Hindgut
(554.4)
Larval Malpighian Tubules
(1185.7)
Larval Fat Body
23.4
Larval Salivary Gland
493.2
Larval Trachea
349.45
Larval Carcass
(991.75)
Adult Head
204.7
Adult Eye
68.375
Adult Brain
78.5
Adult Thoracic-Abdominal Ganglion
117.7
Adult Crop
(925.1)
Adult Midgut
87.8
Adult Hindgut
(579.7)
Adult Malpighian Tubules
300.7
Adult Fat Body
160.3
Adult Salivary Gland
183.6
Adult Heart
255.675
Adult VirginFemale Spermatheca
234.7
Adult InseminatedFemale Spermatheca
193.6
Adult Ovary
21.5
Adult Testis
34.5
Adult Male Accessory Gland
96.7
Adult Carcass
280.3
Expression Level Scale
None
Low
Moderate
High
Linear, scaled to High level expression
Tissue
Expression Level
Larval Central Nervous System
145.2
Larval Midgut
85.8
Larval Hindgut
554.4
Larval Malpighian Tubules
(1185.7)
Larval Fat Body
23.4
Larval Salivary Gland
493.2
Larval Trachea
349.45
Larval Carcass
991.75
Adult Head
204.7
Adult Eye
68.375
Adult Brain
78.5
Adult Thoracic-Abdominal Ganglion
117.7
Adult Crop
925.1
Adult Midgut
87.8
Adult Hindgut
579.7
Adult Malpighian Tubules
300.7
Adult Fat Body
160.3
Adult Salivary Gland
183.6
Adult Heart
255.675
Adult VirginFemale Spermatheca
234.7
Adult InseminatedFemale Spermatheca
193.6
Adult Ovary
21.5
Adult Testis
34.5
Adult Male Accessory Gland
96.7
Adult Carcass
280.3
Expression Level Scale
None
Low
Moderate
High
Very high
Linear, scaled to Very high expression
Tissue
Expression Level
Larval Central Nervous System
145.2
Larval Midgut
85.8
Larval Hindgut
554.4
Larval Malpighian Tubules
1185.7
Larval Fat Body
23.4
Larval Salivary Gland
493.2
Larval Trachea
349.45
Larval Carcass
991.75
Adult Head
204.7
Adult Eye
68.375
Adult Brain
78.5
Adult Thoracic-Abdominal Ganglion
117.7
Adult Crop
925.1
Adult Midgut
87.8
Adult Hindgut
579.7
Adult Malpighian Tubules
300.7
Adult Fat Body
160.3
Adult Salivary Gland
183.6
Adult Heart
255.675
Adult VirginFemale Spermatheca
234.7
Adult InseminatedFemale Spermatheca
193.6
Adult Ovary
21.5
Adult Testis
34.5
Adult Male Accessory Gland
96.7
Adult Carcass
280.3
Expression Level Scale
Very high
log, scaled to maximum expression level
Tissue
Expression Level
Larval Central Nervous System
145.2
Larval Midgut
85.8
Larval Hindgut
554.4
Larval Malpighian Tubules
1185.7
Larval Fat Body
23.4
Larval Salivary Gland
493.2
Larval Trachea
349.45
Larval Carcass
991.75
Adult Head
204.7
Adult Eye
68.375
Adult Brain
78.5
Adult Thoracic-Abdominal Ganglion
117.7
Adult Crop
925.1
Adult Midgut
87.8
Adult Hindgut
579.7
Adult Malpighian Tubules
300.7
Adult Fat Body
160.3
Adult Salivary Gland
183.6
Adult Heart
255.675
Adult VirginFemale Spermatheca
234.7
Adult InseminatedFemale Spermatheca
193.6
Adult Ovary
21.5
Adult Testis
34.5
Adult Male Accessory Gland
96.7
Adult Carcass
280.3
Expression Level Scale
None
Low
Moderate
High
Very high
log, scaled to Moderate expression
Tissue
Expression Level
Larval Central Nervous System
145.2
Larval Midgut
85.8
Larval Hindgut
554.4
Larval Malpighian Tubules
(1185.7)
Larval Fat Body
23.4
Larval Salivary Gland
493.2
Larval Trachea
349.45
Larval Carcass
(991.75)
Adult Head
204.7
Adult Eye
68.375
Adult Brain
78.5
Adult Thoracic-Abdominal Ganglion
117.7
Adult Crop
(925.1)
Adult Midgut
87.8
Adult Hindgut
579.7
Adult Malpighian Tubules
300.7
Adult Fat Body
160.3
Adult Salivary Gland
183.6
Adult Heart
255.675
Adult VirginFemale Spermatheca
234.7
Adult InseminatedFemale Spermatheca
193.6
Adult Ovary
21.5
Adult Testis
34.5
Adult Male Accessory Gland
96.7
Adult Carcass
280.3
Expression Level Scale
None
Low
Moderate
High
log, scaled to High level expression
Tissue
Expression Level
Larval Central Nervous System
145.2
Larval Midgut
85.8
Larval Hindgut
554.4
Larval Malpighian Tubules
1185.7
Larval Fat Body
23.4
Larval Salivary Gland
493.2
Larval Trachea
349.45
Larval Carcass
991.75
Adult Head
204.7
Adult Eye
68.375
Adult Brain
78.5
Adult Thoracic-Abdominal Ganglion
117.7
Adult Crop
925.1
Adult Midgut
87.8
Adult Hindgut
579.7
Adult Malpighian Tubules
300.7
Adult Fat Body
160.3
Adult Salivary Gland
183.6
Adult Heart
255.675
Adult VirginFemale Spermatheca
234.7
Adult InseminatedFemale Spermatheca
193.6
Adult Ovary
21.5
Adult Testis
34.5
Adult Male Accessory Gland
96.7
Adult Carcass
280.3
Expression Level Scale
None
Low
Moderate
High
Very high
log, scaled to Very high expression
Tissue
Expression Level
Larval Central Nervous System
145.2
Larval Midgut
85.8
Larval Hindgut
554.4
Larval Malpighian Tubules
1185.7
Larval Fat Body
23.4
Larval Salivary Gland
493.2
Larval Trachea
349.45
Larval Carcass
991.75
Adult Head
204.7
Adult Eye
68.375
Adult Brain
78.5
Adult Thoracic-Abdominal Ganglion
117.7
Adult Crop
925.1
Adult Midgut
87.8
Adult Hindgut
579.7
Adult Malpighian Tubules
300.7
Adult Fat Body
160.3
Adult Salivary Gland
183.6
Adult Heart
255.675
Adult VirginFemale Spermatheca
234.7
Adult InseminatedFemale Spermatheca
193.6
Adult Ovary
21.5
Adult Testis
34.5
Adult Male Accessory Gland
96.7
Adult Carcass
280.3
Expression Level Scale
None
Low
Moderate
High
Very high
Heatmap
Tissue
Expression Level
Larval Central Nervous System
Larval Midgut
Larval Hindgut
Larval Malpighian Tubules
Larval Fat Body
Larval Salivary Gland
Larval Trachea
Larval Carcass
Adult Head
Adult Eye
Adult Brain
Adult Thoracic-Abdominal Ganglion
Adult Crop
Adult Midgut
Adult Hindgut
Adult Malpighian Tubules
Adult Fat Body
Adult Salivary Gland
Adult Heart
Adult VirginFemale Spermatheca
Adult InseminatedFemale Spermatheca
Adult Ovary
Adult Testis
Adult Male Accessory Gland
Adult Carcass
FlyAtlas Organ/Tissue Expression, larval vs. adult
Summary of modENCODE Temporal Expression Profile: Temporal profile ranges from a peak of high expression to a trough of very low expression. Peak expression observed within 12-24 hour embryonic stages.
[download data (TSV)]
Please Note FlyBase no
longer curates genomic clone accessions so this list
may not be complete
cDNA Clones ( 48 )
Please Note
This section lists
cDNAs and ESTs that fall within the genomic extent
of the gene model, which may include cDNAs and ESTs
of genes within introns, or of overlapping genes.
Please see GBrowse for alignment of the cDNAs and ESTs
to the gene model.
RNAi screen using dsRNA made from templates generated with primers directed against this gene causes a phenotype when assayed in S2R+ cells: cells become round and detached. Kc167 cells are unaffected.
Class I and class II alleles fully complement class IV alleles. Class II alleles fully complement class III alleles. if13ts class I allele fully complements class II alleles, but the transheterozygotes between other class I alleles and class III allele generally die, although a few adult escapers are observed.
Mutational analysis reveals if is required for the development of the adult halteres and legs, as well as the wing. if is required for the formation of the somatic muscle sarcomeric structure, rather than for its maintenance. The function of if in the morphogenesis of the midgut and nerve cord is distinct from its function in muscle attachment and sarcomeric structure.
The functional significance of the cytoplasmic domains of the if, mew and mys subunits of the Position Specific (PS) integrin family are studied by analysing the relationship between the cytoplasmic domain structure and function in the context of a developing organism. The cytoplasmic tail of if is essential for both embryonic and postembryonic processes.
if is essential for the adhesion of muscle and epidermal hemiadherens junctions to extracellular matrix at muscle attachment sites in the developing embryo.
The ability of two different integrin α subunits (encoded by mew and if) to substitute for each other during embryonic development has been studied. The two α subunits encoded by mew and if are not equivalent and have distinct functions which reside in the extracellular domains.
Clonal analysis demonstrates that the different integrins, mew and if, are required on opposite wing epithelia. An early integrin-dependent process, not obviously required for prepupal adhesion, is essential to permit subsequent wing morphogenesis.
if and mys can be localised by an intracellular mechanism within the muscles. Direct localisation of the transmembrane protein to sites of integrin function occurs in cells that lack endogenous mys and if or cells that lack extracellular signals from the tendon cells.
Either splice form of if is sufficient for viability, but they do have distinct requirements during development. if function can replace mew function in the retina.
Phenotypic analysis of mew, if and mys embryos suggests multiple roles for PS integrins in the adhesion of cells and in the formation, organization and migration of embryonic tissues. Although the proteins are often expressed in adjacent embryonic tissues, this distribution does not necessarily reflect equivalent requirements. The complete loss of both α subunits, encoded by mew and if, does not produce all the phenotypes observed in embryos lacking the mys encoded β subunit.
Molecular and genetic analysis prove that the αPS2 integrin subunit is encoded by the if locus. Comparison of the null phenotypes of mys (encoding the ΒPS integrin subunit) and if rules out a model where PS integrin function occurs solely by the direct interaction of the two PS integrins, αPS1ΒPS and αPS2ΒPS.
if has been expressed on the surface of Drosophila tissue culture cells. if gene product promotes cell spreading on two different extra cellular matrix (ECM) molecules, laminin and tiggin.
Structural gene for the α-subunit of position specific integrin 2 (PS2), a large transmembrane protein (Bogaert, Brown and Wilcox, 1987). The β-subunit can associate with either of the two α-subunits, PS1 or PS2 (Brower et al., 1984; Wilcox et al., 1984). Both α and β integrin are expressed in embryonic and larval tissues. In early development, PS2 is found in the mesoderm, localized to muscle attachments (Bogaert, Brown and Wilcox, 1987). Later, PS1 is expressed in the presumptive dorsal epithelium of the third instar imaginal wing discs; also, PS2 is found in the ventral epithelium, both integrins being important for the joining of the dorsal and ventral surfaces of the wing blade (Brower and Jaffe, 1989). Null mutations cause embryonic lethality (Wilcox, DiAntonio and Leptin, 1989). In the mutant if1, the adult wing is inflated with lymph and smaller than normal; venation is defective. Wings later become dry and blistered.
Combinatorial coding of Drosophila muscle shape by Collier and Nautilus. [FBrf0217465]
Goulas et al., 2012, Cell Stem Cell 11(4): 529--540
The par complex and integrins direct asymmetric cell division in adult intestinal stem cells. [FBrf0219511]
Han et al., 2012, FEBS Lett. 586(22): 4031--4037
Tsp66E, the Drosophila KAI1 homologue, and Tsp74F function to regulate ovarian follicle cell and wing development by stabilizing integrin localization. [FBrf0219949]
Kim et al., 2012, Neuron 73(1): 79--91
Integrins Establish Dendrite-Substrate Relationships that Promote Dendritic Self-Avoidance and Patterning in Drosophila Sensory Neurons. [FBrf0217191]
Kókai et al., 2012, BMC Dev. Biol. 12: 20
CalpB modulates border cell migration in Drosophila egg chambers. [FBrf0219464]
Yang and Terman, 2012, Neuron 74(1): 108--121
14-3-3ε couples protein kinase A to semaphorin signaling and silences plexin RasGAP-mediated axonal repulsion. [FBrf0218615]
Zhai et al., 2012, PLoS Genet. 8(3): e1002582
Antagonistic regulation of apoptosis and differentiation by the cut transcription factor represents a tumor-suppressing mechanism in Drosophila. [FBrf0217859]
Baycin-Hizal et al., 2011, J. Proteome Res. 10(6): 2777--2784
GlycoFly: A Database of Drosophila N-linked Glycoproteins Identified Using SPEG-MS Techniques. [FBrf0213834]
Egoz-Matia et al., 2011, Dev. Biol. 351(1): 99--109
Spatial regulation of cell adhesion in the Drosophila wing is mediated by Delilah, a potent activator of βPS integrin expression. [FBrf0213026]
Ellis et al., 2011, J. Cell Sci. 124(11): 1844--1856
In vivo functional analysis reveals specific roles for the integrin-binding sites of talin. [FBrf0213701]
Kendall et al., 2011, J. Biol. Chem. 286(35): 30981--30993
Identification of Integrin {beta} Subunit Mutations That Alter Affinity for Extracellular Matrix Ligand. [FBrf0214781]
Pines et al., 2011, Dev. Dyn. 240(1): 36--51
Distinct regulatory mechanisms control integrin adhesive processes during tissue morphogenesis. [FBrf0212613]
Ribeiro et al., 2011, PLoS Genet. 7(2): e1001295
Phosphoinositide regulation of integrin trafficking required for muscle attachment and maintenance. [FBrf0213137]
Urbano et al., 2011, PLoS ONE 6(9): e23893
PS Integrins and Laminins: Key Regulators of Cell Migration during Drosophila Embryogenesis. [FBrf0216260]
Xie and Auld, 2011, Development 138(17): 3813--3822
Integrins are necessary for the development and maintenance of the glial layers in the Drosophila peripheral nerve. [FBrf0214589]
Zervas et al., 2011, J. Cell Sci. 124(8): 1316--1327
A central multifunctional role of integrin-linked kinase at muscle attachment sites. [FBrf0213331]