The gene Salivary gland secretion 4 is referred to in FlyBase by the symbol Dmel\Sgs4 (CG12181, FBgn0003374). It is a protein_coding_gene from Drosophila melanogaster. It is reported to have molecular function: structural molecule activity. It is reported to be involved in the biological process: puparial adhesion. 41 alleles are reported. No phenotypic data is available. It has one annotated transcript and one annotated polypeptide. Summary of modENCODE Temporal Expression Profile: Temporal profile ranges from a peak of extremely high expression to a trough of no expression detected. Peak expression observed during late larval stages. Summary of FlyAtlas Anatomical Expression Data: Expression at high levels in the following post-embryonic organs or tissues: larval salivary gland. Comments on Affy2 ProbeSet: ProbeSet 1626630_at completely aligns to an exonic region of the only FlyBase-annotated transcript isoform of Sgs4. Gene sequence location is X:3143534..3145073.
User Contributed Data
Phenotypic Description from the Red Book (Lindsley
& Zimm 1992)
Gene/Allele symbols may differ
from current usage
Sgs4
Encodes the salivary-gland glue protein, SGS4; this
protein not required for viability, since non producers eclose
normally; it varies in size owing to a variable number of
copies of a heptapeptide repeat in an N-terminal tandem array.
Expression of the virtually inactive allele, Sgs4H increased
four fold in trans heterozygotes with the normally active
allele, Sgs4OR, and nine fold with a tandem duplication
[Dp(1;1)Co] containing two copies of a normally active allele;
neither Sgs4H/Sgs4Ber nor Sgs4Ber/Sgs4OR exhibits enhanced
activity; enhancement decreased by disruption in pairing,
e.g., in Sgs4H/FM6 (Kornher and Brutlag, 1986, Cell 44:
879-83).
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FB2013_03
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Summary of FlyAtlas Anatomical Expression Data: Expression at high levels in the following post-embryonic organs or tissues: larval salivary gland.
[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
1.325
Larval Midgut
28.2
Larval Hindgut
4.8
Larval Malpighian Tubules
3
Larval Fat Body
1067.9
Larval Salivary Gland
10141.3
Larval Trachea
7.75
Larval Carcass
3.65
Adult Head
0.6
Adult Eye
3.125
Adult Brain
0.6
Adult Thoracic-Abdominal Ganglion
0.7
Adult Crop
1.6
Adult Midgut
1.6
Adult Hindgut
0.7
Adult Malpighian Tubules
3.5
Adult Fat Body
8.1
Adult Salivary Gland
13.2
Adult Heart
1
Adult VirginFemale Spermatheca
3.5
Adult InseminatedFemale Spermatheca
1
Adult Ovary
0.5
Adult Testis
1.5
Adult Male Accessory Gland
2.5
Adult Carcass
0.9
Expression Level Scale
None
Low
Moderate
High
Very high
Linear, scaled to Moderate expression
Tissue
Expression Level
Larval Central Nervous System
1.325
Larval Midgut
28.2
Larval Hindgut
4.8
Larval Malpighian Tubules
3
Larval Fat Body
(1067.9)
Larval Salivary Gland
(10141.3)
Larval Trachea
7.75
Larval Carcass
3.65
Adult Head
0.6
Adult Eye
3.125
Adult Brain
0.6
Adult Thoracic-Abdominal Ganglion
0.7
Adult Crop
1.6
Adult Midgut
1.6
Adult Hindgut
0.7
Adult Malpighian Tubules
3.5
Adult Fat Body
8.1
Adult Salivary Gland
13.2
Adult Heart
1
Adult VirginFemale Spermatheca
3.5
Adult InseminatedFemale Spermatheca
1
Adult Ovary
0.5
Adult Testis
1.5
Adult Male Accessory Gland
2.5
Adult Carcass
0.9
Expression Level Scale
None
Low
Moderate
High
Linear, scaled to High level expression
Tissue
Expression Level
Larval Central Nervous System
1.325
Larval Midgut
28.2
Larval Hindgut
4.8
Larval Malpighian Tubules
3
Larval Fat Body
1067.9
Larval Salivary Gland
(10141.3)
Larval Trachea
7.75
Larval Carcass
3.65
Adult Head
0.6
Adult Eye
3.125
Adult Brain
0.6
Adult Thoracic-Abdominal Ganglion
0.7
Adult Crop
1.6
Adult Midgut
1.6
Adult Hindgut
0.7
Adult Malpighian Tubules
3.5
Adult Fat Body
8.1
Adult Salivary Gland
13.2
Adult Heart
1
Adult VirginFemale Spermatheca
3.5
Adult InseminatedFemale Spermatheca
1
Adult Ovary
0.5
Adult Testis
1.5
Adult Male Accessory Gland
2.5
Adult Carcass
0.9
Expression Level Scale
None
Low
Moderate
High
Very high
Linear, scaled to Very high expression
Tissue
Expression Level
Larval Central Nervous System
1.325
Larval Midgut
28.2
Larval Hindgut
4.8
Larval Malpighian Tubules
3
Larval Fat Body
1067.9
Larval Salivary Gland
10141.3
Larval Trachea
7.75
Larval Carcass
3.65
Adult Head
0.6
Adult Eye
3.125
Adult Brain
0.6
Adult Thoracic-Abdominal Ganglion
0.7
Adult Crop
1.6
Adult Midgut
1.6
Adult Hindgut
0.7
Adult Malpighian Tubules
3.5
Adult Fat Body
8.1
Adult Salivary Gland
13.2
Adult Heart
1
Adult VirginFemale Spermatheca
3.5
Adult InseminatedFemale Spermatheca
1
Adult Ovary
0.5
Adult Testis
1.5
Adult Male Accessory Gland
2.5
Adult Carcass
0.9
Expression Level Scale
Very high
log, scaled to maximum expression level
Tissue
Expression Level
Larval Central Nervous System
1.325
Larval Midgut
28.2
Larval Hindgut
4.8
Larval Malpighian Tubules
3
Larval Fat Body
1067.9
Larval Salivary Gland
10141.3
Larval Trachea
7.75
Larval Carcass
3.65
Adult Head
0.6
Adult Eye
3.125
Adult Brain
0.6
Adult Thoracic-Abdominal Ganglion
0.7
Adult Crop
1.6
Adult Midgut
1.6
Adult Hindgut
0.7
Adult Malpighian Tubules
3.5
Adult Fat Body
8.1
Adult Salivary Gland
13.2
Adult Heart
1
Adult VirginFemale Spermatheca
3.5
Adult InseminatedFemale Spermatheca
1
Adult Ovary
0.5
Adult Testis
1.5
Adult Male Accessory Gland
2.5
Adult Carcass
0.9
Expression Level Scale
None
Low
Moderate
High
Very high
log, scaled to Moderate expression
Tissue
Expression Level
Larval Central Nervous System
1.325
Larval Midgut
28.2
Larval Hindgut
4.8
Larval Malpighian Tubules
3
Larval Fat Body
(1067.9)
Larval Salivary Gland
(10141.3)
Larval Trachea
7.75
Larval Carcass
3.65
Adult Head
0.6
Adult Eye
3.125
Adult Brain
0.6
Adult Thoracic-Abdominal Ganglion
0.7
Adult Crop
1.6
Adult Midgut
1.6
Adult Hindgut
0.7
Adult Malpighian Tubules
3.5
Adult Fat Body
8.1
Adult Salivary Gland
13.2
Adult Heart
1
Adult VirginFemale Spermatheca
3.5
Adult InseminatedFemale Spermatheca
1
Adult Ovary
0.5
Adult Testis
1.5
Adult Male Accessory Gland
2.5
Adult Carcass
0.9
Expression Level Scale
None
Low
Moderate
High
log, scaled to High level expression
Tissue
Expression Level
Larval Central Nervous System
1.325
Larval Midgut
28.2
Larval Hindgut
4.8
Larval Malpighian Tubules
3
Larval Fat Body
1067.9
Larval Salivary Gland
(10141.3)
Larval Trachea
7.75
Larval Carcass
3.65
Adult Head
0.6
Adult Eye
3.125
Adult Brain
0.6
Adult Thoracic-Abdominal Ganglion
0.7
Adult Crop
1.6
Adult Midgut
1.6
Adult Hindgut
0.7
Adult Malpighian Tubules
3.5
Adult Fat Body
8.1
Adult Salivary Gland
13.2
Adult Heart
1
Adult VirginFemale Spermatheca
3.5
Adult InseminatedFemale Spermatheca
1
Adult Ovary
0.5
Adult Testis
1.5
Adult Male Accessory Gland
2.5
Adult Carcass
0.9
Expression Level Scale
None
Low
Moderate
High
Very high
log, scaled to Very high expression
Tissue
Expression Level
Larval Central Nervous System
1.325
Larval Midgut
28.2
Larval Hindgut
4.8
Larval Malpighian Tubules
3
Larval Fat Body
1067.9
Larval Salivary Gland
10141.3
Larval Trachea
7.75
Larval Carcass
3.65
Adult Head
0.6
Adult Eye
3.125
Adult Brain
0.6
Adult Thoracic-Abdominal Ganglion
0.7
Adult Crop
1.6
Adult Midgut
1.6
Adult Hindgut
0.7
Adult Malpighian Tubules
3.5
Adult Fat Body
8.1
Adult Salivary Gland
13.2
Adult Heart
1
Adult VirginFemale Spermatheca
3.5
Adult InseminatedFemale Spermatheca
1
Adult Ovary
0.5
Adult Testis
1.5
Adult Male Accessory Gland
2.5
Adult Carcass
0.9
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 extremely high expression to a trough of no expression detected. Peak expression observed during late larval stages.
[download data (TSV)]
Please Note FlyBase no
longer curates genomic clone accessions so this list
may not be complete
cDNA Clones ( 2 )
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.
fkh protein binds to multiple sites in the Sgs4 upstream region. The fkh binding sites of the EcRU (ecdysone response unit) are necessary for full transcriptional induction of Sgs4.
The EcR product binds to two sites, element I and element II, in the regulatory region of Sgs4. Element II appears to be of no importance for the expression of Sgs4 while element I is an ecdysone response element necessary, but not sufficient, for Sgs4 induction. Close to elements I and II lie two binding sites for the Sebp3 product. One of these sites is necessary but not sufficient for Sgs4 expression. This hormone response unit also contains binding sites for the fkh product, which coincide with binding sites for Broad Complex products.
Cis-acting sequences required for dosage compensation are located within 840bp upstream of the gene. Germline transformation studies and a comparison of sequences from several dosage compensation genes reveal sequences within the coding region and/or downstream of the gene also play a role in dosage compensation.
There is evidence that the br-C directly mediates the ecdysone-dependent transcriptional switch, that leads to Sgs4 induction and Pig1 repression, by binding to sites within element III.
An investigation of the relationship between transcription, puffing and hormone regulation of intermoult puff was analysed using ecd1 mutant embryos: Sgs4 expression is severely reduced by shifting ecd1 embryos to the restrictive temperature, 30oC. Normal sized 3C11-12 puff can be formed in conditions in which Sgs4 transcription is severely reduced.
Sgs4 encodes a salivary-gland glue protein. One of a group of seven genes encoding proteins that are components of the secretion produced by the larval salivary glands during the third instar for the purpose of attaching the larva to the substrate preparative to pupariation.
Adh reporter gene constructs demonstrate Sgs4 is expressed throughout development in the proventriculus and salivary glands. This expression pattern differs form other glue genes and is unique to Sgs4.
The region of Sgs4 needed for developmentally regulated puffing is defined as a 2.5kb 5' upstream fragment. Puff formation requires only the 840bp promoter region, formation of cytologically visible puff depends on the strength of the promoter. Puff formation therefore depends on a cis-acting element which functions through interaction with trans-acting factors.
Sgs4 transcription in cultured wild-type and su(f)8 third instar larval salivary glands in the presence and absence of 20-OH-ecdysone has been studied.
Initiation of transcription of Sgs4, but not of intermolt-puff formation seems to depend on the presence of suitable levels of ecdysterone in early third instar larvae.
Antagonistic regulation of apoptosis and differentiation by the cut transcription factor represents a tumor-suppressing mechanism in Drosophila. [FBrf0217859]
Ou et al., 2011, PLoS Biol. 9(9): e1001160
Nuclear Receptor DHR4 Controls the Timing of Steroid Hormone Pulses During Drosophila Development. [FBrf0216318]