The gene Cysteine string protein is referred to in FlyBase by the symbol Dmel\Csp (CG6395, FBgn0004179). 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: startle response; brain morphogenesis; exocytosis; locomotion involved in locomotory behavior. 58 alleles are reported. The phenotypes of these alleles are annotated with: eye; interommatidial bristle; neuromuscular junction; embryonic/larval neuromuscular junction; wing; ommatidium. It has 5 annotated transcripts and 5 annotated polypeptides. Protein features are: DnaJ domain; DnaJ domain, conserved site. Summary of modENCODE Temporal Expression Profile: Temporal profile ranges from a peak of high expression to a trough of moderately high expression. Peak expression observed within 00-12 and 18-24 hour embryonic stages. Summary of FlyAtlas Anatomical Expression Data: High or moderate levels of expression observed in all larval and adult organs/tissues. Expression at high levels in the following post-embryonic organs or tissues: adult head, adult eye, larval/adult central nervous system, larval/adult midgut, larval hindgut, larval/adult Malpighian tubules, larval/adult salivary gland, adult spermathecae, adult male accessory gland. Expression at moderate levels in the following post-embryonic organs or tissues: adult crop, adult hindgut, adult heart, larval/adult fat body, larval trachea, adult ovary, adult testis, larval/adult carcass. Comments on Affy2 ProbeSet: ProbeSet 1636651_a_at completely aligns to an exonic region common to each of the 3 FlyBase-annotated transcript isoforms of Csp. Gene sequence location is 3L:22260668..22266845.
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Csp is expressed in central brain neuropils. It is broadly seen in the R1-R6 terminals, but appears especially to line the borders facing the cartridge interior. Using immunoelectron microscopy, Csp is detected in the photoreceptor cells close to the T-bar ribbon surrounded by synaptic vesicles.
Csp protein is detected presynaptically at larval and adult neuromuscular junctions. Synaptic boutons are strongly stained. In the CNS, Synapse rich regions of the neuropil are stained, but the surrounding cell bodies are not. One isoform is detected predominantly in photoreceptor terminals but not at motor nerve terminals. Csp protein is thought to be associated with synaptic vesicles.
Summary of FlyAtlas Anatomical Expression Data: High or moderate levels of expression observed in all larval and adult organs/tissues. Expression at high levels in the following post-embryonic organs or tissues: adult head, adult eye, larval/adult central nervous system, larval/adult midgut, larval hindgut, larval/adult Malpighian tubules, larval/adult salivary gland, adult spermathecae, adult male accessory gland. Expression at moderate levels in the following post-embryonic organs or tissues: adult crop, adult hindgut, adult heart, larval/adult fat body, larval trachea, adult ovary, adult testis, larval/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
1134.15
Larval Midgut
926
Larval Hindgut
736.4
Larval Malpighian Tubules
553.7
Larval Fat Body
239.6
Larval Salivary Gland
810.5
Larval Trachea
493.775
Larval Carcass
476.95
Adult Head
588.2
Adult Eye
905.35
Adult Brain
1093.9
Adult Thoracic-Abdominal Ganglion
1385.6
Adult Crop
444.8
Adult Midgut
571.4
Adult Hindgut
456.8
Adult Malpighian Tubules
911.5
Adult Fat Body
305.4
Adult Salivary Gland
707
Adult Heart
214.85
Adult VirginFemale Spermatheca
698.9
Adult InseminatedFemale Spermatheca
993.1
Adult Ovary
417.2
Adult Testis
102.4
Adult Male Accessory Gland
772
Adult Carcass
189
Expression Level Scale
None
Low
Moderate
High
Very high
Linear, scaled to Moderate expression
Tissue
Expression Level
Larval Central Nervous System
(1134.15)
Larval Midgut
(926)
Larval Hindgut
(736.4)
Larval Malpighian Tubules
(553.7)
Larval Fat Body
239.6
Larval Salivary Gland
(810.5)
Larval Trachea
493.775
Larval Carcass
476.95
Adult Head
(588.2)
Adult Eye
(905.35)
Adult Brain
(1093.9)
Adult Thoracic-Abdominal Ganglion
(1385.6)
Adult Crop
444.8
Adult Midgut
(571.4)
Adult Hindgut
456.8
Adult Malpighian Tubules
(911.5)
Adult Fat Body
305.4
Adult Salivary Gland
(707)
Adult Heart
214.85
Adult VirginFemale Spermatheca
(698.9)
Adult InseminatedFemale Spermatheca
(993.1)
Adult Ovary
417.2
Adult Testis
102.4
Adult Male Accessory Gland
(772)
Adult Carcass
189
Expression Level Scale
None
Low
Moderate
High
Linear, scaled to High level expression
Tissue
Expression Level
Larval Central Nervous System
(1134.15)
Larval Midgut
926
Larval Hindgut
736.4
Larval Malpighian Tubules
553.7
Larval Fat Body
239.6
Larval Salivary Gland
810.5
Larval Trachea
493.775
Larval Carcass
476.95
Adult Head
588.2
Adult Eye
905.35
Adult Brain
(1093.9)
Adult Thoracic-Abdominal Ganglion
(1385.6)
Adult Crop
444.8
Adult Midgut
571.4
Adult Hindgut
456.8
Adult Malpighian Tubules
911.5
Adult Fat Body
305.4
Adult Salivary Gland
707
Adult Heart
214.85
Adult VirginFemale Spermatheca
698.9
Adult InseminatedFemale Spermatheca
993.1
Adult Ovary
417.2
Adult Testis
102.4
Adult Male Accessory Gland
772
Adult Carcass
189
Expression Level Scale
None
Low
Moderate
High
Very high
Linear, scaled to Very high expression
Tissue
Expression Level
Larval Central Nervous System
1134.15
Larval Midgut
926
Larval Hindgut
736.4
Larval Malpighian Tubules
553.7
Larval Fat Body
239.6
Larval Salivary Gland
810.5
Larval Trachea
493.775
Larval Carcass
476.95
Adult Head
588.2
Adult Eye
905.35
Adult Brain
1093.9
Adult Thoracic-Abdominal Ganglion
1385.6
Adult Crop
444.8
Adult Midgut
571.4
Adult Hindgut
456.8
Adult Malpighian Tubules
911.5
Adult Fat Body
305.4
Adult Salivary Gland
707
Adult Heart
214.85
Adult VirginFemale Spermatheca
698.9
Adult InseminatedFemale Spermatheca
993.1
Adult Ovary
417.2
Adult Testis
102.4
Adult Male Accessory Gland
772
Adult Carcass
189
Expression Level Scale
Very high
log, scaled to maximum expression level
Tissue
Expression Level
Larval Central Nervous System
1134.15
Larval Midgut
926
Larval Hindgut
736.4
Larval Malpighian Tubules
553.7
Larval Fat Body
239.6
Larval Salivary Gland
810.5
Larval Trachea
493.775
Larval Carcass
476.95
Adult Head
588.2
Adult Eye
905.35
Adult Brain
1093.9
Adult Thoracic-Abdominal Ganglion
1385.6
Adult Crop
444.8
Adult Midgut
571.4
Adult Hindgut
456.8
Adult Malpighian Tubules
911.5
Adult Fat Body
305.4
Adult Salivary Gland
707
Adult Heart
214.85
Adult VirginFemale Spermatheca
698.9
Adult InseminatedFemale Spermatheca
993.1
Adult Ovary
417.2
Adult Testis
102.4
Adult Male Accessory Gland
772
Adult Carcass
189
Expression Level Scale
None
Low
Moderate
High
Very high
log, scaled to Moderate expression
Tissue
Expression Level
Larval Central Nervous System
(1134.15)
Larval Midgut
(926)
Larval Hindgut
736.4
Larval Malpighian Tubules
553.7
Larval Fat Body
239.6
Larval Salivary Gland
810.5
Larval Trachea
493.775
Larval Carcass
476.95
Adult Head
588.2
Adult Eye
(905.35)
Adult Brain
(1093.9)
Adult Thoracic-Abdominal Ganglion
(1385.6)
Adult Crop
444.8
Adult Midgut
571.4
Adult Hindgut
456.8
Adult Malpighian Tubules
(911.5)
Adult Fat Body
305.4
Adult Salivary Gland
707
Adult Heart
214.85
Adult VirginFemale Spermatheca
698.9
Adult InseminatedFemale Spermatheca
(993.1)
Adult Ovary
417.2
Adult Testis
102.4
Adult Male Accessory Gland
772
Adult Carcass
189
Expression Level Scale
None
Low
Moderate
High
log, scaled to High level expression
Tissue
Expression Level
Larval Central Nervous System
1134.15
Larval Midgut
926
Larval Hindgut
736.4
Larval Malpighian Tubules
553.7
Larval Fat Body
239.6
Larval Salivary Gland
810.5
Larval Trachea
493.775
Larval Carcass
476.95
Adult Head
588.2
Adult Eye
905.35
Adult Brain
1093.9
Adult Thoracic-Abdominal Ganglion
1385.6
Adult Crop
444.8
Adult Midgut
571.4
Adult Hindgut
456.8
Adult Malpighian Tubules
911.5
Adult Fat Body
305.4
Adult Salivary Gland
707
Adult Heart
214.85
Adult VirginFemale Spermatheca
698.9
Adult InseminatedFemale Spermatheca
993.1
Adult Ovary
417.2
Adult Testis
102.4
Adult Male Accessory Gland
772
Adult Carcass
189
Expression Level Scale
None
Low
Moderate
High
Very high
log, scaled to Very high expression
Tissue
Expression Level
Larval Central Nervous System
1134.15
Larval Midgut
926
Larval Hindgut
736.4
Larval Malpighian Tubules
553.7
Larval Fat Body
239.6
Larval Salivary Gland
810.5
Larval Trachea
493.775
Larval Carcass
476.95
Adult Head
588.2
Adult Eye
905.35
Adult Brain
1093.9
Adult Thoracic-Abdominal Ganglion
1385.6
Adult Crop
444.8
Adult Midgut
571.4
Adult Hindgut
456.8
Adult Malpighian Tubules
911.5
Adult Fat Body
305.4
Adult Salivary Gland
707
Adult Heart
214.85
Adult VirginFemale Spermatheca
698.9
Adult InseminatedFemale Spermatheca
993.1
Adult Ovary
417.2
Adult Testis
102.4
Adult Male Accessory Gland
772
Adult Carcass
189
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 moderately high expression. Peak expression observed within 00-12 and 18-24 hour embryonic stages.
[download data (TSV)]
Please Note FlyBase no
longer curates genomic clone accessions so this list
may not be complete
cDNA Clones ( 175 )
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.
Csp has multiple functions at synaptic terminals. Csp plays a direct role in exocytosis downstream from Ca2+ entry. Csp seems to increase the Ca2+ sensitivity of the exocytotic machinery.
An analysis of the excitatory postsynaptic currents from depolarized motor nerve terminals leads to the conclusion that Csp protein is involved in neurotransmitter release and helps to synchronise evoked neurotransmitter release at nerve terminals.
Biochemical characterisation of Csp suggests that fatty acyl groups do not form the main anchor of Csp in membranes as the complete removal of this modification does not dissociate Csp from the membrane.
Neuromuscular transmission is impaired presynaptically in Csp mutant larvae. Csp mutations disrupt depolarisation-secretion coupling, depolarisation fails to trigger transmitter release. This disruption explains the cellular basis of the temperature sensitive paralysis of the mutant larvae.
Csp gene product is required for stabilizing the components of the neurotransmitter release machinery, lack of Csp gene product causes block of synaptic transmissions at high temperatures.
Csp expression pattern has been studied: MAB ab49 antibodies were used to screen cDNA expression libraries to identify clones coding for recognized protein fragments.
Beck et al., 2012, J. Neurosci. 32(20): 7058--7073
Regulation of Fasciclin II and Synaptic Terminal Development by the Splicing Factor Beag. [FBrf0218385]
Bridon et al., 2012, J. Proteome Res. 11(2): 927--940
Improvement of Phosphoproteome Analyses Using FAIMS and Decision Tree Fragmentation. Application to the Insulin Signaling Pathway in Drosophila melanogaster S2 Cells. [FBrf0217365]
Cook et al., 2012, PLoS ONE 7(9): e44440
Increased RhoA Prenylation in the loechrig (loe) Mutant Leads to Progressive Neurodegeneration. [FBrf0219441]
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]
Füger et al., 2012, PLoS Genet. 8(11): e1003066
Spastic Paraplegia Mutation N256S in the Neuronal Microtubule Motor KIF5A Disrupts Axonal Transport in a Drosophila HSP Model. [FBrf0220146]
Jin et al., 2012, PLoS ONE 7(7): e40912
Similarities of Drosophila rab GTPases Based on Expression Profiling: Completion and Analysis of the rab-Gal4 Kit. [FBrf0219021]
Kim et al., 2012, Genes Dev. 26(9): 974--987
Drosophila Neto is essential for clustering glutamate receptors at the neuromuscular junction. [FBrf0218161]
Lagisz et al., 2012, Heredity 108(6): 602--608
Two distinct genomic regions, harbouring the period and fruitless genes, affect male courtship song in Drosophila montana. [FBrf0218390]
Mozer and Sandstrom, 2012, Mol. Cell. Neurosci. 51(3-4): 89--100
Drosophila neuroligin 1 regulates synaptic growth and function in response to activity and phosphoinositide-3-kinase. [FBrf0219839]
Wishart et al., 2012, PLoS Genet. 8(8): e1002936
Combining comparative proteomics and molecular genetics uncovers regulators of synaptic and axonal stability and degeneration in vivo. [FBrf0219374]
Brooks et al., 2011, Neuron 72(2): 316--329
A putative vesicular transporter expressed in Drosophila mushroom bodies that mediates sexual behavior may define a neurotransmitter system. [FBrf0216456]
Chan et al., 2011, Curr. Biol. 21(20): 1704--1715
Systematic discovery of rab GTPases with synaptic functions in Drosophila. [FBrf0216517]
Henthorn et al., 2011, Mol. Biol. Cell 22(21): 4038--4046
A role for kinesin heavy chain in controlling vesicle transport into dendrites in Drosophila. [FBrf0216511]
Lanson et al., 2011, Hum. Mol. Genet. 20(13): 2510--2523
A Drosophila model of FUS-related neurodegeneration reveals genetic interaction between FUS and TDP-43. [FBrf0213887]
Liu et al., 2011, J. Neurosci. 31(6): 2052--2063
Drosophila Acyl-CoA Synthetase Long-Chain Family Member 4 Regulates Axonal Transport of Synaptic Vesicles and Is Required for Synaptic Development and Transmission. [FBrf0212968]
Miśkiewicz et al., 2011, Neuron 72(5): 776--788
ELP3 Controls Active Zone Morphology by Acetylating the ELKS Family Member Bruchpilot. [FBrf0216903]
Moua et al., 2011, Development 138(6): 1087--1092
Kinesin-1 tail autoregulation and microtubule-binding regions function in saltatory transport but not ooplasmic streaming. [FBrf0213072]
Paddock et al., 2011, J. Neurosci. 31(6): 2248--2257
Membrane penetration by synaptotagmin is required for coupling calcium binding to vesicle fusion in vivo. [FBrf0212995]
Rossetto et al., 2011, Hum. Mol. Genet. 20(21): 4248--4257
Defhc1.1, a homologue of the juvenile myoclonic gene EFHC1, modulates architecture and basal activity of the neuromuscular junction in Drosophila. [FBrf0216330]
Sarthi and Elefant, 2011, PLoS ONE 6(10): e26202
dTip60 HAT Activity Controls Synaptic Bouton Expansion at the Drosophila Neuromuscular Junction. [FBrf0216592]
Uytterhoeven et al., 2011, Cell 145(1): 117--132
Loss of skywalker reveals synaptic endosomes as sorting stations for synaptic vesicle proteins. [FBrf0213384]
Wang et al., 2011, J. Clin. Invest. 121(10): 4118--4126
The ALS-associated proteins FUS and TDP-43 function together to affect Drosophila locomotion and life span. [FBrf0216240]