The gene commissureless is referred to in FlyBase by the symbol Dmel\comm (CG17943, FBgn0010105). It is a protein_coding_gene from Drosophila melanogaster. There is experimental evidence that it has the molecular function: WW domain binding; protein binding. There is experimental evidence that it is involved in the biological process: synapse assembly; receptor internalization; positive regulation of receptor internalization; axon guidance; dendrite morphogenesis; axon midline choice point recognition; neuron recognition; dendrite guidance. 93 alleles are reported. The phenotypes of these alleles are annotated with: organ system; organ system subdivision; multicellular structure; embryonic/larval neuron; thoracic segment; non-connected developing system; portion of tissue; peripheral nervous system; adult segment; cell part; late extended germ band embryo. It has 2 annotated transcripts and 2 annotated polypeptides. 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 00-12 hour embryonic stages. Summary of FlyAtlas Anatomical Expression Data: Expression at high levels in the following post-embryonic organs or tissues: adult crop. Expression at moderate levels in the following post-embryonic organs or tissues: adult head, adult eye, larval/adult central nervous system, larval/adult hindgut, larval Malpighian tubules, larval/adult salivary gland. Comments on Affy2 ProbeSet: ProbeSet 1636089_at completely aligns to an exonic region of the only FlyBase-annotated transcript isoform of comm. Gene sequence location is 3L:15714611..15721530.
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comm expression is first observed during the cellular blastoderm stage in a pattern of six pair-rule stripes. Stripe 3 is initially missing but subsequently appears. By stage 6, the stripes narrow and interstripes appear forming a pattern of 14 stripes which persist until stage 10. At this time expression is seen in two longitudinal stripes located just lateral to the neurogenic region and extending the length of the segmented embryo. A segmentally repeated pattern is also observed in the emerging CNS. comm is expressed in a subset of neuroblasts and in some ganglion mother cells. By stage 12, expression is observed in the midline of the CNS and in the visceral mesoderm. Along the midline, expression becomes restricted to a subset of cells located at the anterior part of each neuromere. There is also transient expression in neurons just lateral to the midline cells including RP1 and RP3. Double labeling experiments show that these cells lie along the path that the first commissural axons take to reach the midline. From their position, they are thought to be the anterior two pairs of midline glia. comm expression ceases in stage 16.
comm protein appears to accumulate predominantly within intracellular vesicles with a low level present on the plasma membrane. The comm protein likely cycles from the Golgi to the cell surface where some of it is endocytosed.
Summary of FlyAtlas Anatomical Expression Data: Expression at high levels in the following post-embryonic organs or tissues: adult crop. Expression at moderate levels in the following post-embryonic organs or tissues: adult head, adult eye, larval/adult central nervous system, larval/adult hindgut, larval Malpighian tubules, larval/adult 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
162.325
Larval Midgut
37.1
Larval Hindgut
140.9
Larval Malpighian Tubules
201.6
Larval Fat Body
20.5
Larval Salivary Gland
341.8
Larval Trachea
65.075
Larval Carcass
59.625
Adult Head
125.6
Adult Eye
173.4
Adult Brain
186.2
Adult Thoracic-Abdominal Ganglion
143.9
Adult Crop
768.9
Adult Midgut
45.2
Adult Hindgut
246.9
Adult Malpighian Tubules
60.1
Adult Fat Body
61.5
Adult Salivary Gland
389.6
Adult Heart
90.6
Adult VirginFemale Spermatheca
64.4
Adult InseminatedFemale Spermatheca
47.8
Adult Ovary
5.3
Adult Testis
18.6
Adult Male Accessory Gland
47.1
Adult Carcass
73.5
Expression Level Scale
None
Low
Moderate
High
Linear, scaled to Moderate expression
Tissue
Expression Level
Larval Central Nervous System
162.325
Larval Midgut
37.1
Larval Hindgut
140.9
Larval Malpighian Tubules
201.6
Larval Fat Body
20.5
Larval Salivary Gland
341.8
Larval Trachea
65.075
Larval Carcass
59.625
Adult Head
125.6
Adult Eye
173.4
Adult Brain
186.2
Adult Thoracic-Abdominal Ganglion
143.9
Adult Crop
(768.9)
Adult Midgut
45.2
Adult Hindgut
246.9
Adult Malpighian Tubules
60.1
Adult Fat Body
61.5
Adult Salivary Gland
389.6
Adult Heart
90.6
Adult VirginFemale Spermatheca
64.4
Adult InseminatedFemale Spermatheca
47.8
Adult Ovary
5.3
Adult Testis
18.6
Adult Male Accessory Gland
47.1
Adult Carcass
73.5
Expression Level Scale
None
Low
Moderate
High
Linear, scaled to High level expression
Tissue
Expression Level
Larval Central Nervous System
162.325
Larval Midgut
37.1
Larval Hindgut
140.9
Larval Malpighian Tubules
201.6
Larval Fat Body
20.5
Larval Salivary Gland
341.8
Larval Trachea
65.075
Larval Carcass
59.625
Adult Head
125.6
Adult Eye
173.4
Adult Brain
186.2
Adult Thoracic-Abdominal Ganglion
143.9
Adult Crop
768.9
Adult Midgut
45.2
Adult Hindgut
246.9
Adult Malpighian Tubules
60.1
Adult Fat Body
61.5
Adult Salivary Gland
389.6
Adult Heart
90.6
Adult VirginFemale Spermatheca
64.4
Adult InseminatedFemale Spermatheca
47.8
Adult Ovary
5.3
Adult Testis
18.6
Adult Male Accessory Gland
47.1
Adult Carcass
73.5
Expression Level Scale
None
Low
Moderate
High
Very high
Linear, scaled to Very high expression
Tissue
Expression Level
Larval Central Nervous System
162.325
Larval Midgut
37.1
Larval Hindgut
140.9
Larval Malpighian Tubules
201.6
Larval Fat Body
20.5
Larval Salivary Gland
341.8
Larval Trachea
65.075
Larval Carcass
59.625
Adult Head
125.6
Adult Eye
173.4
Adult Brain
186.2
Adult Thoracic-Abdominal Ganglion
143.9
Adult Crop
768.9
Adult Midgut
45.2
Adult Hindgut
246.9
Adult Malpighian Tubules
60.1
Adult Fat Body
61.5
Adult Salivary Gland
389.6
Adult Heart
90.6
Adult VirginFemale Spermatheca
64.4
Adult InseminatedFemale Spermatheca
47.8
Adult Ovary
5.3
Adult Testis
18.6
Adult Male Accessory Gland
47.1
Adult Carcass
73.5
Expression Level Scale
Very high
log, scaled to maximum expression level
Tissue
Expression Level
Larval Central Nervous System
162.325
Larval Midgut
37.1
Larval Hindgut
140.9
Larval Malpighian Tubules
201.6
Larval Fat Body
20.5
Larval Salivary Gland
341.8
Larval Trachea
65.075
Larval Carcass
59.625
Adult Head
125.6
Adult Eye
173.4
Adult Brain
186.2
Adult Thoracic-Abdominal Ganglion
143.9
Adult Crop
768.9
Adult Midgut
45.2
Adult Hindgut
246.9
Adult Malpighian Tubules
60.1
Adult Fat Body
61.5
Adult Salivary Gland
389.6
Adult Heart
90.6
Adult VirginFemale Spermatheca
64.4
Adult InseminatedFemale Spermatheca
47.8
Adult Ovary
5.3
Adult Testis
18.6
Adult Male Accessory Gland
47.1
Adult Carcass
73.5
Expression Level Scale
None
Low
Moderate
High
Very high
log, scaled to Moderate expression
Tissue
Expression Level
Larval Central Nervous System
162.325
Larval Midgut
37.1
Larval Hindgut
140.9
Larval Malpighian Tubules
201.6
Larval Fat Body
20.5
Larval Salivary Gland
341.8
Larval Trachea
65.075
Larval Carcass
59.625
Adult Head
125.6
Adult Eye
173.4
Adult Brain
186.2
Adult Thoracic-Abdominal Ganglion
143.9
Adult Crop
768.9
Adult Midgut
45.2
Adult Hindgut
246.9
Adult Malpighian Tubules
60.1
Adult Fat Body
61.5
Adult Salivary Gland
389.6
Adult Heart
90.6
Adult VirginFemale Spermatheca
64.4
Adult InseminatedFemale Spermatheca
47.8
Adult Ovary
5.3
Adult Testis
18.6
Adult Male Accessory Gland
47.1
Adult Carcass
73.5
Expression Level Scale
None
Low
Moderate
High
log, scaled to High level expression
Tissue
Expression Level
Larval Central Nervous System
162.325
Larval Midgut
37.1
Larval Hindgut
140.9
Larval Malpighian Tubules
201.6
Larval Fat Body
20.5
Larval Salivary Gland
341.8
Larval Trachea
65.075
Larval Carcass
59.625
Adult Head
125.6
Adult Eye
173.4
Adult Brain
186.2
Adult Thoracic-Abdominal Ganglion
143.9
Adult Crop
768.9
Adult Midgut
45.2
Adult Hindgut
246.9
Adult Malpighian Tubules
60.1
Adult Fat Body
61.5
Adult Salivary Gland
389.6
Adult Heart
90.6
Adult VirginFemale Spermatheca
64.4
Adult InseminatedFemale Spermatheca
47.8
Adult Ovary
5.3
Adult Testis
18.6
Adult Male Accessory Gland
47.1
Adult Carcass
73.5
Expression Level Scale
None
Low
Moderate
High
Very high
log, scaled to Very high expression
Tissue
Expression Level
Larval Central Nervous System
162.325
Larval Midgut
37.1
Larval Hindgut
140.9
Larval Malpighian Tubules
201.6
Larval Fat Body
20.5
Larval Salivary Gland
341.8
Larval Trachea
65.075
Larval Carcass
59.625
Adult Head
125.6
Adult Eye
173.4
Adult Brain
186.2
Adult Thoracic-Abdominal Ganglion
143.9
Adult Crop
768.9
Adult Midgut
45.2
Adult Hindgut
246.9
Adult Malpighian Tubules
60.1
Adult Fat Body
61.5
Adult Salivary Gland
389.6
Adult Heart
90.6
Adult VirginFemale Spermatheca
64.4
Adult InseminatedFemale Spermatheca
47.8
Adult Ovary
5.3
Adult Testis
18.6
Adult Male Accessory Gland
47.1
Adult Carcass
73.5
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 00-12 hour embryonic stages.
[download data (TSV)]
Please Note FlyBase no
longer curates genomic clone accessions so this list
may not be complete
cDNA Clones ( 54 )
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.
comm acts as a sorting receptor for robo, diverting it from synthetic to the late endocytic pathway. comm seems to be required in the commissural neurons not in midline cells for midline crossing.
The intracellular region of comm is essential for the downregulation of robo. comm redistributes robo away from the cell surface. robo and comm form a stable complex in S2 cells. comm is a specific binding partner and substrate of Nedd4.
comm controls growth cone guidance across the CNS midline and encodes a novel membrane protein. As commissural growth cones contact and traverse the CNS midline, the comm protein is apparently transferred from midline glia to commissural axons.
The comm gene product is required for commissural growth cones to bypass a general repulsive system operating at the midline. In the absence of comm commissural growth cones that are attracted to the midline by other mechanisms are unable to cross and ultimately retract their commissural projections.
The comm gene product plays a role in the attractive signalling system, a component of the mechanism that guides growth cones towards and away from the midline. In mutant embryos the growth cones of commissural neurons do not project across the midline, but extend only on their own side of the central nervous system (CNS).
Evans and Bashaw, 2012, Dev. Biol. 363(1): 266--278
Slit/Robo-mediated axon guidance in Tribolium and Drosophila: Divergent genetic programs build insect nervous systems. [FBrf0217506]
Hadar et al., 2012, Gene 494(1): 65--72
A screen identifying genes responsive to Dpp and Wg signaling in the Drosophila developing wing. [FBrf0217293]
Slováková et al., 2012, J. Neurosci. 32(29): 10035--10044
The Actin-Binding Protein Canoe/AF-6 Forms a Complex with Robo and Is Required for Slit-Robo Signaling during Axon Pathfinding at the CNS Midline. [FBrf0218957]
Smibert et al., 2012, Cell Rep. 1(3): 277--289
Global Patterns of Tissue-Specific Alternative Polyadenylation in Drosophila. [FBrf0218523]
Weber et al., 2012, PLoS ONE 7(4): e34745
Genome-Wide Association Analysis of Oxidative Stress Resistance in Drosophila melanogaster. [FBrf0218073]