The gene chaoptic is referred to in FlyBase by the symbol Dmel\chp (CG1744, FBgn0000313). It is a protein_coding_gene from Drosophila melanogaster. Its molecular function is unknown. There is experimental evidence that it is involved in the biological process: rhabdomere development; homophilic cell adhesion. 16 alleles are reported. The phenotypes of these alleles are annotated with: mesothoracic tergum; rhabdomere. It has 5 annotated transcripts and 5 annotated polypeptides. Protein features are: Armadillo; Leucine-rich repeat; Leucine-rich repeat, typical subtype. Summary of modENCODE Temporal Expression Profile: Temporal profile ranges from a peak of very high expression to a trough of extremely low expression. Peak expression observed during late pupal stages. Summary of FlyAtlas Anatomical Expression Data: Expression at high levels in the following post-embryonic organs or tissues: adult head, adult eye. Expression at moderate levels in the following post-embryonic organs or tissues: adult male accessory gland. Comments on Affy2 ProbeSet: ProbeSet 1636344_at completely aligns to an exonic region of the only FlyBase-annotated transcript isoform of chp. Gene sequence location is 3R:27029902..27036452.
User Contributed Data
Phenotypic Description from the Red Book (Lindsley
& Zimm 1992)
Gene/Allele symbols may differ
from current usage
chp: chaoptic
The structural gene encoding chaoptin, a 160 kd
glycoprotein localized to the extracellular membrane surface
of photoreceptor cells and their axonal projections to the
optic ganglia. Protein first identified by a monoclonal antibody (MAb24B10). Antigen first appears behind the morphogenetic furrow during differentiation of the eye imaginal
disk. Defective alleles, chp1 and chp2, recognized by reduced
levels of antigen. Rhabdomeres of mutant photoreceptor cells
highly deranged or nearly absent in homozygotes and hemizygotes for chp1 or chp2, respectively; also close apposition of
adjacent retinular cells partially disrupted. Gene product
postulated to play role in cell surface interactions necessary
for correct alignment of the microvilli that form the rhabdomeres.
Recent Updates
Description
What does this section display?
This section contains items that were added to this record for each release.
It currently only tracks new links between this FlyBase report and other
FlyBase data classes (e.g. genes, references, stocks) or controlled
vocabulary terms (e.g. GO, anatomy terms).
What does this section not display?
This section does not currently display links that were removed or gene model changes.
Update Feed
Click the icon below to subscribe to this FlyBase record and receive updates automatically through your
feed reader.
FB2013_03
FB2013_02
All updates
Click here to see a list of all updates to this record from FB2010_08 and on.
chp protein is expressed in photoreceptor cell soma and their axons as well as in the optic lobe. Mutants chp1 and chp2 show abnormal distribution of antigen and greatly reduced levels of antigen in some tissues.
Summary of FlyAtlas Anatomical Expression Data: Expression at high levels in the following post-embryonic organs or tissues: adult head, adult eye. Expression at moderate levels in the following post-embryonic organs or tissues: adult male accessory 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
19.625
Larval Midgut
4.2
Larval Hindgut
5.6
Larval Malpighian Tubules
2.1
Larval Fat Body
6.7
Larval Salivary Gland
5.1
Larval Trachea
133.95
Larval Carcass
4.625
Adult Head
2471.8
Adult Eye
5610.75
Adult Brain
36.9
Adult Thoracic-Abdominal Ganglion
4.1
Adult Crop
4.2
Adult Midgut
2.8
Adult Hindgut
4.7
Adult Malpighian Tubules
4.9
Adult Fat Body
7.3
Adult Salivary Gland
11.3
Adult Heart
8.85
Adult VirginFemale Spermatheca
5.8
Adult InseminatedFemale Spermatheca
9.3
Adult Ovary
1.6
Adult Testis
6.8
Adult Male Accessory Gland
356.3
Adult Carcass
10.3
Expression Level Scale
None
Low
Moderate
High
Very high
Linear, scaled to Moderate expression
Tissue
Expression Level
Larval Central Nervous System
19.625
Larval Midgut
4.2
Larval Hindgut
5.6
Larval Malpighian Tubules
2.1
Larval Fat Body
6.7
Larval Salivary Gland
5.1
Larval Trachea
133.95
Larval Carcass
4.625
Adult Head
(2471.8)
Adult Eye
(5610.75)
Adult Brain
36.9
Adult Thoracic-Abdominal Ganglion
4.1
Adult Crop
4.2
Adult Midgut
2.8
Adult Hindgut
4.7
Adult Malpighian Tubules
4.9
Adult Fat Body
7.3
Adult Salivary Gland
11.3
Adult Heart
8.85
Adult VirginFemale Spermatheca
5.8
Adult InseminatedFemale Spermatheca
9.3
Adult Ovary
1.6
Adult Testis
6.8
Adult Male Accessory Gland
356.3
Adult Carcass
10.3
Expression Level Scale
None
Low
Moderate
High
Linear, scaled to High level expression
Tissue
Expression Level
Larval Central Nervous System
19.625
Larval Midgut
4.2
Larval Hindgut
5.6
Larval Malpighian Tubules
2.1
Larval Fat Body
6.7
Larval Salivary Gland
5.1
Larval Trachea
133.95
Larval Carcass
4.625
Adult Head
(2471.8)
Adult Eye
(5610.75)
Adult Brain
36.9
Adult Thoracic-Abdominal Ganglion
4.1
Adult Crop
4.2
Adult Midgut
2.8
Adult Hindgut
4.7
Adult Malpighian Tubules
4.9
Adult Fat Body
7.3
Adult Salivary Gland
11.3
Adult Heart
8.85
Adult VirginFemale Spermatheca
5.8
Adult InseminatedFemale Spermatheca
9.3
Adult Ovary
1.6
Adult Testis
6.8
Adult Male Accessory Gland
356.3
Adult Carcass
10.3
Expression Level Scale
None
Low
Moderate
High
Very high
Linear, scaled to Very high expression
Tissue
Expression Level
Larval Central Nervous System
19.625
Larval Midgut
4.2
Larval Hindgut
5.6
Larval Malpighian Tubules
2.1
Larval Fat Body
6.7
Larval Salivary Gland
5.1
Larval Trachea
133.95
Larval Carcass
4.625
Adult Head
2471.8
Adult Eye
5610.75
Adult Brain
36.9
Adult Thoracic-Abdominal Ganglion
4.1
Adult Crop
4.2
Adult Midgut
2.8
Adult Hindgut
4.7
Adult Malpighian Tubules
4.9
Adult Fat Body
7.3
Adult Salivary Gland
11.3
Adult Heart
8.85
Adult VirginFemale Spermatheca
5.8
Adult InseminatedFemale Spermatheca
9.3
Adult Ovary
1.6
Adult Testis
6.8
Adult Male Accessory Gland
356.3
Adult Carcass
10.3
Expression Level Scale
Very high
log, scaled to maximum expression level
Tissue
Expression Level
Larval Central Nervous System
19.625
Larval Midgut
4.2
Larval Hindgut
5.6
Larval Malpighian Tubules
2.1
Larval Fat Body
6.7
Larval Salivary Gland
5.1
Larval Trachea
133.95
Larval Carcass
4.625
Adult Head
2471.8
Adult Eye
5610.75
Adult Brain
36.9
Adult Thoracic-Abdominal Ganglion
4.1
Adult Crop
4.2
Adult Midgut
2.8
Adult Hindgut
4.7
Adult Malpighian Tubules
4.9
Adult Fat Body
7.3
Adult Salivary Gland
11.3
Adult Heart
8.85
Adult VirginFemale Spermatheca
5.8
Adult InseminatedFemale Spermatheca
9.3
Adult Ovary
1.6
Adult Testis
6.8
Adult Male Accessory Gland
356.3
Adult Carcass
10.3
Expression Level Scale
None
Low
Moderate
High
Very high
log, scaled to Moderate expression
Tissue
Expression Level
Larval Central Nervous System
19.625
Larval Midgut
4.2
Larval Hindgut
5.6
Larval Malpighian Tubules
2.1
Larval Fat Body
6.7
Larval Salivary Gland
5.1
Larval Trachea
133.95
Larval Carcass
4.625
Adult Head
(2471.8)
Adult Eye
(5610.75)
Adult Brain
36.9
Adult Thoracic-Abdominal Ganglion
4.1
Adult Crop
4.2
Adult Midgut
2.8
Adult Hindgut
4.7
Adult Malpighian Tubules
4.9
Adult Fat Body
7.3
Adult Salivary Gland
11.3
Adult Heart
8.85
Adult VirginFemale Spermatheca
5.8
Adult InseminatedFemale Spermatheca
9.3
Adult Ovary
1.6
Adult Testis
6.8
Adult Male Accessory Gland
356.3
Adult Carcass
10.3
Expression Level Scale
None
Low
Moderate
High
log, scaled to High level expression
Tissue
Expression Level
Larval Central Nervous System
19.625
Larval Midgut
4.2
Larval Hindgut
5.6
Larval Malpighian Tubules
2.1
Larval Fat Body
6.7
Larval Salivary Gland
5.1
Larval Trachea
133.95
Larval Carcass
4.625
Adult Head
(2471.8)
Adult Eye
(5610.75)
Adult Brain
36.9
Adult Thoracic-Abdominal Ganglion
4.1
Adult Crop
4.2
Adult Midgut
2.8
Adult Hindgut
4.7
Adult Malpighian Tubules
4.9
Adult Fat Body
7.3
Adult Salivary Gland
11.3
Adult Heart
8.85
Adult VirginFemale Spermatheca
5.8
Adult InseminatedFemale Spermatheca
9.3
Adult Ovary
1.6
Adult Testis
6.8
Adult Male Accessory Gland
356.3
Adult Carcass
10.3
Expression Level Scale
None
Low
Moderate
High
Very high
log, scaled to Very high expression
Tissue
Expression Level
Larval Central Nervous System
19.625
Larval Midgut
4.2
Larval Hindgut
5.6
Larval Malpighian Tubules
2.1
Larval Fat Body
6.7
Larval Salivary Gland
5.1
Larval Trachea
133.95
Larval Carcass
4.625
Adult Head
2471.8
Adult Eye
5610.75
Adult Brain
36.9
Adult Thoracic-Abdominal Ganglion
4.1
Adult Crop
4.2
Adult Midgut
2.8
Adult Hindgut
4.7
Adult Malpighian Tubules
4.9
Adult Fat Body
7.3
Adult Salivary Gland
11.3
Adult Heart
8.85
Adult VirginFemale Spermatheca
5.8
Adult InseminatedFemale Spermatheca
9.3
Adult Ovary
1.6
Adult Testis
6.8
Adult Male Accessory Gland
356.3
Adult Carcass
10.3
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 very high expression to a trough of extremely low expression. Peak expression observed during late pupal stages.
[download data (TSV)]
Please Note FlyBase no
longer curates genomic clone accessions so this list
may not be complete
cDNA Clones ( 78 )
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.
The "idl-A" complementation probably corresponds to alleles of the "chp" locus; idl-A mutants fail to complement hypomorphic chp alleles for inaD mislocalisation and retinal degeneration.
The biophysical and biochemical characteristics of a synthetic Leu-rich repeat peptide (CRP32) generated from the sequence of one of the repeats found in chp is studied.
Biochemical analyses demonstrate that chp is linked to the extracellular surface by covalent attachment to glycosyl-phosphotidylinositol: chp is required for photoreceptor cell morphogenesis. Results suggest that chp and other members of the leucine rich repeat family of proteins define a new class of cell adhesion molecules.
The structural gene encoding chaoptin, a 160kD glycoprotein localized to the extracellular membrane surface of photoreceptor cells and their axonal projections to the optic ganglia. Protein first identified by a monoclonal antibody (MAb24B10). Antigen first appears behind the morphogenetic furrow during differentiation of the eye imaginal disk. Defective alleles, chp1 and chp2, recognized by reduced levels of antigen. Rhabdomeres of mutant photoreceptor cells highly deranged or nearly absent in homozygotes and hemizygotes for chp1 or chp2, respectively; also close apposition of adjacent retinular cells partially disrupted. Gene product postulated to play role in cell surface interactions necessary for correct alignment of the microvilli that form the rhabdomeres.
Neurexin Regulates Visual Function via Mediating Retinoid Transport to Promote Rhodopsin Maturation. [FBrf0220614]
Dimitroff et al., 2012, PLoS ONE 7(2): e30722
Diet and Energy-Sensing Inputs Affect TorC1-Mediated Axon Misrouting but Not TorC2-Directed Synapse Growth in a Drosophila Model of Tuberous Sclerosis. [FBrf0217461]
Fichelson et al., 2012, Proc. Natl. Acad. Sci. U.S.A. 109(20): 7893--7898
Orthodenticle and Kruppel homolog 1 regulate Drosophila photoreceptor maturation. [FBrf0218313]
Kametaka et al., 2012, J. Cell Sci. 125(3): 634--648
AP-1 clathrin adaptor and CG8538/Aftiphilin are involved in Notch signaling during eye development in Drosophila melanogaster. [FBrf0217589]
Rosenbaum et al., 2012, Vis. Neurosci. 29(3): 143--156
Drosophila GPI-mannosyltransferase 2 is required for GPI anchor attachment and surface expression of chaoptin. [FBrf0218440]
Timofeev et al., 2012, Neuron 75(1): 80--93
Localized netrins act as positional cues to control layer-specific targeting of photoreceptor axons in Drosophila. [FBrf0218874]
Yano et al., 2012, J. Neurogenet. 26(1): 53--63
Identification of proteasome components required for apical localization of chaoptin using functional genomics. [FBrf0217843]
Abou Tayoun et al., 2011, J. Neurosci. 31(39): 13897--13910
The Drosophila SK Channel (dSK) Contributes to Photoreceptor Performance by Mediating Sensitivity Control at the First Visual Network. [FBrf0216279]
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]
Gontang et al., 2011, Development 138(22): 4899--4909
The cytoskeletal regulator Genghis khan is required for columnar target specificity in the Drosophila visual system. [FBrf0216508]
Hakeda-Suzuki et al., 2011, Nat. Neurosci. 14(3): 314--323
Golden Goal collaborates with Flamingo in conferring synaptic-layer specificity in the visual system. [FBrf0213128]
Hasegawa et al., 2011, Development 138(5): 983--993
Concentric zones, cell migration and neuronal circuits in the Drosophila visual center. [FBrf0213020]
Keene et al., 2011, J. Neurosci. 31(17): 6527--6534