The gene disconnected is referred to in FlyBase by the symbol Dmel\disco (CG9908, FBgn0000459). It is a protein_coding_gene from Drosophila melanogaster. There is experimental evidence that it has the molecular function: DNA binding. There is experimental evidence that it is involved in the biological process: brain development; eclosion rhythm; locomotor rhythm; positive regulation of transcription from RNA polymerase II promoter. 25 alleles are reported. The phenotypes of these alleles are annotated with: organ system subdivision; organ system; nervous system; external compound sense organ; thoracic segment; cuticle; presumptive embryonic/larval nervous system; cephalopharyngeal skeleton; multi-cell-component structure; peripheral nervous system. It has 2 annotated transcripts and 2 annotated polypeptides. Protein features are: Zinc finger, C2H2; Zinc finger, C2H2-like. Summary of modENCODE Temporal Expression Profile: Temporal profile ranges from a peak of moderately high expression to a trough of very low expression. Peak expression observed within 06-12 hour embryonic stages. Summary of FlyAtlas Anatomical Expression Data: Expression at moderate levels in the following post-embryonic organs or tissues: adult head, larval central nervous system. Comments on Affy2 ProbeSet: ProbeSet 1639940_at completely aligns to an exonic region common to each of the 2 FlyBase-annotated transcript isoforms of disco. Gene sequence location is X:16104631..16110779.
User Contributed Data
Phenotypic Description from the Red Book (Lindsley
& Zimm 1992)
Gene/Allele symbols may differ
from current usage
disco: disconnected (J.C. Hall and H. Steller)
Compound eyes are disconnected from optic ganglia in
most mutant individuals, but approximately 5-10% have superficially normal eye-brain connections. Photoreceptor cells initially present but degenerate progressively with age; axons of
photoreceptor cells which are still present form plexus
beneath the eye. Focus of gene function fate maps to a point
well anterior to the focus of either the eye or optic lobe
(Fischbach).
Adult defect arises as consequence of a defect in the larval
visual nerve (Bolwig's nerve) which fails to connect with its
target cells in the central nervous system; subsequently,
owing to loss of the pioneer function of Bolwig's nerve,
retinular axons fail to innevate their target cells in the
developing optic lobes leading to massive degeneration of the
optic ganglia during the early pupal stages (Steller and
Rubin). Slight disarray of embryonic peripheral nervous system detectable; occasional errant neurons seen. Developing
CNS appears normal, but adult brain is abnormal in that certain lateral neurons, which normally express per are either
absent or do not express per (Zerr et al.). Larval reacts
normally to all stimuli except light. All alleles display
significantly reduced viability; death occurs in late pupal
stages as pharate adults. In tests of circadian rhythms,
eclosion and adult locomotor activity are essentially
arrhythmic (Dushay et al.). Cyclical expression of per protein, which normally occurs in eyes and brain, is fairly
robust in disco, whether eyes connected to the brain or not
(Zerr et al.); hence this eye rhythm may be autonomous, i.e.,
given absence of CNS neuronal staining in mutant adults.
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The disco transcript is first detected in the posterior pole of the cellular blastoderm, and expression in then detected in anterior regions. Following head involution, expression is detected in the gnathal buds, labral and antennal segments as well as in the posterior of the procephalic lobe. Signal is also detected in the ectoderm of the thoracic segments, as well as in the visceral mesoderm. Following germ band retraction, expression in detected in the ventral nerve cord and in a sheet of cells surrounding the gut.
disco transcripts are first detected at 6hr of embryonic development. They are detected throughout embryonic and larval stages and increase in abundance at each larval molt. Levels remain high in pupae and drop in adults where transcripts are detected at higher levels in head than body RNA.
disco protein expression essentially recapitualtes the disco transcript expression pattern. In addition to the regions marked by in situ hybridization, disco antibody staining detects expression in the cardioblast cells which give rise to the dorsal vessel. A segmentally repeated pattern is also detected in the lateral ectoderm near the peripheral nervous system. Expression is also detected in tissues which give rise to the visual system.
Summary of FlyAtlas Anatomical Expression Data: Expression at moderate levels in the following post-embryonic organs or tissues: adult head, larval central nervous system.
[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
151.875
Larval Midgut
18
Larval Hindgut
64.2
Larval Malpighian Tubules
5.8
Larval Fat Body
2.4
Larval Salivary Gland
8.4
Larval Trachea
7.425
Larval Carcass
24.675
Adult Head
104.8
Adult Eye
59.125
Adult Brain
61.2
Adult Thoracic-Abdominal Ganglion
31.5
Adult Crop
80.3
Adult Midgut
25.7
Adult Hindgut
35.4
Adult Malpighian Tubules
4.6
Adult Fat Body
11.5
Adult Salivary Gland
10.6
Adult Heart
39.475
Adult VirginFemale Spermatheca
13.4
Adult InseminatedFemale Spermatheca
11.2
Adult Ovary
1.8
Adult Testis
8.7
Adult Male Accessory Gland
40
Adult Carcass
34.3
Expression Level Scale
None
Low
Moderate
Linear, scaled to Moderate expression
Tissue
Expression Level
Larval Central Nervous System
151.875
Larval Midgut
18
Larval Hindgut
64.2
Larval Malpighian Tubules
5.8
Larval Fat Body
2.4
Larval Salivary Gland
8.4
Larval Trachea
7.425
Larval Carcass
24.675
Adult Head
104.8
Adult Eye
59.125
Adult Brain
61.2
Adult Thoracic-Abdominal Ganglion
31.5
Adult Crop
80.3
Adult Midgut
25.7
Adult Hindgut
35.4
Adult Malpighian Tubules
4.6
Adult Fat Body
11.5
Adult Salivary Gland
10.6
Adult Heart
39.475
Adult VirginFemale Spermatheca
13.4
Adult InseminatedFemale Spermatheca
11.2
Adult Ovary
1.8
Adult Testis
8.7
Adult Male Accessory Gland
40
Adult Carcass
34.3
Expression Level Scale
None
Low
Moderate
High
Linear, scaled to High level expression
Tissue
Expression Level
Larval Central Nervous System
151.875
Larval Midgut
18
Larval Hindgut
64.2
Larval Malpighian Tubules
5.8
Larval Fat Body
2.4
Larval Salivary Gland
8.4
Larval Trachea
7.425
Larval Carcass
24.675
Adult Head
104.8
Adult Eye
59.125
Adult Brain
61.2
Adult Thoracic-Abdominal Ganglion
31.5
Adult Crop
80.3
Adult Midgut
25.7
Adult Hindgut
35.4
Adult Malpighian Tubules
4.6
Adult Fat Body
11.5
Adult Salivary Gland
10.6
Adult Heart
39.475
Adult VirginFemale Spermatheca
13.4
Adult InseminatedFemale Spermatheca
11.2
Adult Ovary
1.8
Adult Testis
8.7
Adult Male Accessory Gland
40
Adult Carcass
34.3
Expression Level Scale
None
Low
Moderate
High
Very high
Linear, scaled to Very high expression
Tissue
Expression Level
Larval Central Nervous System
151.875
Larval Midgut
18
Larval Hindgut
64.2
Larval Malpighian Tubules
5.8
Larval Fat Body
2.4
Larval Salivary Gland
8.4
Larval Trachea
7.425
Larval Carcass
24.675
Adult Head
104.8
Adult Eye
59.125
Adult Brain
61.2
Adult Thoracic-Abdominal Ganglion
31.5
Adult Crop
80.3
Adult Midgut
25.7
Adult Hindgut
35.4
Adult Malpighian Tubules
4.6
Adult Fat Body
11.5
Adult Salivary Gland
10.6
Adult Heart
39.475
Adult VirginFemale Spermatheca
13.4
Adult InseminatedFemale Spermatheca
11.2
Adult Ovary
1.8
Adult Testis
8.7
Adult Male Accessory Gland
40
Adult Carcass
34.3
Expression Level Scale
Very high
log, scaled to maximum expression level
Tissue
Expression Level
Larval Central Nervous System
151.875
Larval Midgut
18
Larval Hindgut
64.2
Larval Malpighian Tubules
5.8
Larval Fat Body
2.4
Larval Salivary Gland
8.4
Larval Trachea
7.425
Larval Carcass
24.675
Adult Head
104.8
Adult Eye
59.125
Adult Brain
61.2
Adult Thoracic-Abdominal Ganglion
31.5
Adult Crop
80.3
Adult Midgut
25.7
Adult Hindgut
35.4
Adult Malpighian Tubules
4.6
Adult Fat Body
11.5
Adult Salivary Gland
10.6
Adult Heart
39.475
Adult VirginFemale Spermatheca
13.4
Adult InseminatedFemale Spermatheca
11.2
Adult Ovary
1.8
Adult Testis
8.7
Adult Male Accessory Gland
40
Adult Carcass
34.3
Expression Level Scale
None
Low
Moderate
log, scaled to Moderate expression
Tissue
Expression Level
Larval Central Nervous System
151.875
Larval Midgut
18
Larval Hindgut
64.2
Larval Malpighian Tubules
5.8
Larval Fat Body
2.4
Larval Salivary Gland
8.4
Larval Trachea
7.425
Larval Carcass
24.675
Adult Head
104.8
Adult Eye
59.125
Adult Brain
61.2
Adult Thoracic-Abdominal Ganglion
31.5
Adult Crop
80.3
Adult Midgut
25.7
Adult Hindgut
35.4
Adult Malpighian Tubules
4.6
Adult Fat Body
11.5
Adult Salivary Gland
10.6
Adult Heart
39.475
Adult VirginFemale Spermatheca
13.4
Adult InseminatedFemale Spermatheca
11.2
Adult Ovary
1.8
Adult Testis
8.7
Adult Male Accessory Gland
40
Adult Carcass
34.3
Expression Level Scale
None
Low
Moderate
High
log, scaled to High level expression
Tissue
Expression Level
Larval Central Nervous System
151.875
Larval Midgut
18
Larval Hindgut
64.2
Larval Malpighian Tubules
5.8
Larval Fat Body
2.4
Larval Salivary Gland
8.4
Larval Trachea
7.425
Larval Carcass
24.675
Adult Head
104.8
Adult Eye
59.125
Adult Brain
61.2
Adult Thoracic-Abdominal Ganglion
31.5
Adult Crop
80.3
Adult Midgut
25.7
Adult Hindgut
35.4
Adult Malpighian Tubules
4.6
Adult Fat Body
11.5
Adult Salivary Gland
10.6
Adult Heart
39.475
Adult VirginFemale Spermatheca
13.4
Adult InseminatedFemale Spermatheca
11.2
Adult Ovary
1.8
Adult Testis
8.7
Adult Male Accessory Gland
40
Adult Carcass
34.3
Expression Level Scale
None
Low
Moderate
High
Very high
log, scaled to Very high expression
Tissue
Expression Level
Larval Central Nervous System
151.875
Larval Midgut
18
Larval Hindgut
64.2
Larval Malpighian Tubules
5.8
Larval Fat Body
2.4
Larval Salivary Gland
8.4
Larval Trachea
7.425
Larval Carcass
24.675
Adult Head
104.8
Adult Eye
59.125
Adult Brain
61.2
Adult Thoracic-Abdominal Ganglion
31.5
Adult Crop
80.3
Adult Midgut
25.7
Adult Hindgut
35.4
Adult Malpighian Tubules
4.6
Adult Fat Body
11.5
Adult Salivary Gland
10.6
Adult Heart
39.475
Adult VirginFemale Spermatheca
13.4
Adult InseminatedFemale Spermatheca
11.2
Adult Ovary
1.8
Adult Testis
8.7
Adult Male Accessory Gland
40
Adult Carcass
34.3
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 moderately high expression to a trough of very low expression. Peak expression observed within 06-12 hour embryonic stages.
[download data (TSV)]
Please Note FlyBase no
longer curates genomic clone accessions so this list
may not be complete
cDNA Clones ( 25 )
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.
disco and disco-r appear to have redundant functions during development of the larval head. Presence of either gene is sufficient for normal development of the mandibular, maxillary and labial lobes.
Mutations disrupt neural cell patterning in the visual system, leading to the loss of many optic lobe neurons. The presence of a single ventral lateral neurons (LNV) is sufficient to provoke robust circadian rhythmicity in locomotor activity if the LNV terminals reach the superior protocerebrum.
The development of an identified serotonergic aborization that projects from the central brain has been analysed. Using mutations of disco that impair the connectivity of the larval optic nerve to the larval neuropil centre it is concluded that neither cell viability nor the initial outgrowth of this projection depends on the presence of the larval optic nerve. Aborization of the projection within the larval optic neuropil requires the presence of the larval optic nerve.
Genetic mosaic analysis demonstrates that R cell degeneration in disco mutant does not depend on the genotype of cells in the eye and is strictly correlated with the failure of R cells to project to the optic ganglia. Retinal degeneration can be rescued by the establishment of connections with disorganized optic lobes.
disco flies are rhythmic, indicating they have an active circadian pacemaker that can be entrained by light. Analysis of mutants suggests they block or interfere with elements of the circadian system located between the central pacemaker and its outputs that mediate overt rhythms.
Mutant analysis suggests that light normally triggers the coupling of multiple ultradian oscillators into a functional circadian clock and that this process is disrupted in disco mutant flies as a result of the neural lesion.
disco mutants have a characteristic deformed eye: the absence of the Bolwig nerve in larvae prevents retinula axons from finding their way to the optic lobe.
Mosaic analysis and fate mapping data concludes that the primary defect responsible for the adult disco phenotype is a failure of Bolwig's nerve to contact its correct target cells during embryonic development.
The adult phenotype of disco is caused by a pathfinding defect of a larval pioneer nerve. disco is required for the navigation of a specific subset of neurons in the peripheral nervous system. Phenotypic analyses and genetic mosaic experiments suggest that disco mutations affect the nerve rather than the target in the CNS or cells guiding the nerve's growth cone.