The gene stoned B is referred to in FlyBase by the symbol Dmel\stnB (CG12473, FBgn0016975). It is a protein_coding_gene from Drosophila melanogaster. There is experimental evidence that it has the molecular function: protein binding. There is experimental evidence that it is involved in the biological process: synaptic transmission; regulation of synaptic vesicle endocytosis; synaptic vesicle transport; synaptic vesicle endocytosis. 14 alleles are reported. The phenotypes of these alleles are annotated with: multivesicular body; axon terminus; synaptic vesicle. It has 2 annotated transcripts and 2 annotated polypeptides. Protein features are: Clathrin adaptor, mu subunit, C-terminal; Stonin; Stonin homology. 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 18-24 hour embryonic stages. This gene is annotated by FlyBase as a dicistronic gene, meaning that some or all of its transcripts encode two or more polypeptide-coding open reading frames (ORFs) , with each ORF assigned to a different gene. The distribution of RNA-Seq coverage data amongst the different encoded genes cannot be determined. Summary of FlyAtlas Anatomical Expression Data: Expression at high levels in the following post-embryonic organs or tissues: adult head, adult eye, larval/adult central nervous system. Comments on Affy2 ProbeSet: ProbeSet 1625007_a_at aligns to a genomic region shared by exons of 2 FlyBase-annotated genes; hence it is impossible to interpret the expression pattern and levels of stnB expression signal. See the GBrowse view of stnB to determine the overlapping gene(s). Gene sequence location is X:22382558..22406483.
User Contributed Data
External Summaries
Phenotypic Description from the Red Book (Lindsley
& Zimm 1992)
Gene/Allele symbols may differ
from current usage
stn: stoned (J.C. Hall)
Exists as temperature-sensitive behavioral,
temperature-sensitive lethal, and unconditionally lethal
alleles. Severe behavioral debilitation is quickly induced by
shift of adult stn6 and stn7 from 25 to 29; abnormalities at
high temperature include uncoordinated leg and wing movements,
with complete paralysis never occurring (e.g., legs still
move); stn6 causes some debilitation at 22 (slow movements,
occasionally falling over); whereas stn7 is more nearly normal
at low temperatures, and can even walk with difficulty at 29;
at permissive temperatures, stn (allele unspecified) causes
unusual jump response to light-off stimulus, which is more
pronounced in combination with w (Kelly, 1983b); associated
with this abnormal jumping is an increase in amplitude of
light-off transient spike of electroretinogram (ERG); in tests
of light-adapted mutant, the jump response, as monitored by
recordings from indirect flight muscles, habituates with
increasing frequencies of light-off stimulation (Kelly,
1983b); combining stn with tan, which by itself leads to
decreased amplitude of ERG on and off transients, leads to
loss of anomalous jumping and partial restoration of light-off
spike. In biochemical experiments, stn (allele unspecified)
found to cause accentuation of in vivo phosphorylation of a
protein from adult head synaptosomal fractions that is modified in this way by a cAMP-dependent protein kinase, with such
phosphorylation being enhanced by exposure of flies to light,
prior to extraction (Kelly, 1983a). A protein, which has same
molecular weight as the one noted above, found to be phosphorylated in vitro by a fly-derived Ca2+-calmodulin-dependent
protein kinase; stn causes increased levels of in vivo phosphorylation of this material (Kelly, 1983b). The
temperature-sensitive lethal allele, stn, leads to brief
paralysis, followed by sporadic movements, as a result of
mechanical shocking (Homyk and Sheppard, 1977, Genetics
87: 95-104); other abnormalities include abnormally short
jump and flight distances, apparent absence of on and off
transients in ERG, and lethality when raised at 29. Effects
of three of the lethal alleles, stn1, stn11, and stn14, were
examined during development for effects on gross anatomy of
CNS or PNS; no obvious abnormalities were observed (Perrimon
et al., 1989).
Recent Updates
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Unlike the stnA protein, the mobility of the
stnB protein is not altered under reducing conditions. The stnB
protein shows limited homology to the rat AP50 subunit of the
clathrin-associated protein AP2 complex.
Summary of FlyAtlas Anatomical Expression Data: Expression at high levels in the following post-embryonic organs or tissues: adult head, adult eye, larval/adult 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
743.525
Larval Midgut
11.5
Larval Hindgut
5.8
Larval Malpighian Tubules
2.8
Larval Fat Body
5
Larval Salivary Gland
7.3
Larval Trachea
16.425
Larval Carcass
11.225
Adult Head
656
Adult Eye
1047
Adult Brain
1963.5
Adult Thoracic-Abdominal Ganglion
2260.7
Adult Crop
8.7
Adult Midgut
8.6
Adult Hindgut
8.3
Adult Malpighian Tubules
5.4
Adult Fat Body
16
Adult Salivary Gland
22
Adult Heart
11.35
Adult VirginFemale Spermatheca
10.9
Adult InseminatedFemale Spermatheca
10.8
Adult Ovary
2.9
Adult Testis
2.1
Adult Male Accessory Gland
9.3
Adult Carcass
45
Expression Level Scale
None
Low
Moderate
High
Very high
Linear, scaled to Moderate expression
Tissue
Expression Level
Larval Central Nervous System
(743.525)
Larval Midgut
11.5
Larval Hindgut
5.8
Larval Malpighian Tubules
2.8
Larval Fat Body
5
Larval Salivary Gland
7.3
Larval Trachea
16.425
Larval Carcass
11.225
Adult Head
(656)
Adult Eye
(1047)
Adult Brain
(1963.5)
Adult Thoracic-Abdominal Ganglion
(2260.7)
Adult Crop
8.7
Adult Midgut
8.6
Adult Hindgut
8.3
Adult Malpighian Tubules
5.4
Adult Fat Body
16
Adult Salivary Gland
22
Adult Heart
11.35
Adult VirginFemale Spermatheca
10.9
Adult InseminatedFemale Spermatheca
10.8
Adult Ovary
2.9
Adult Testis
2.1
Adult Male Accessory Gland
9.3
Adult Carcass
45
Expression Level Scale
None
Low
Moderate
High
Linear, scaled to High level expression
Tissue
Expression Level
Larval Central Nervous System
743.525
Larval Midgut
11.5
Larval Hindgut
5.8
Larval Malpighian Tubules
2.8
Larval Fat Body
5
Larval Salivary Gland
7.3
Larval Trachea
16.425
Larval Carcass
11.225
Adult Head
656
Adult Eye
1047
Adult Brain
(1963.5)
Adult Thoracic-Abdominal Ganglion
(2260.7)
Adult Crop
8.7
Adult Midgut
8.6
Adult Hindgut
8.3
Adult Malpighian Tubules
5.4
Adult Fat Body
16
Adult Salivary Gland
22
Adult Heart
11.35
Adult VirginFemale Spermatheca
10.9
Adult InseminatedFemale Spermatheca
10.8
Adult Ovary
2.9
Adult Testis
2.1
Adult Male Accessory Gland
9.3
Adult Carcass
45
Expression Level Scale
None
Low
Moderate
High
Very high
Linear, scaled to Very high expression
Tissue
Expression Level
Larval Central Nervous System
743.525
Larval Midgut
11.5
Larval Hindgut
5.8
Larval Malpighian Tubules
2.8
Larval Fat Body
5
Larval Salivary Gland
7.3
Larval Trachea
16.425
Larval Carcass
11.225
Adult Head
656
Adult Eye
1047
Adult Brain
1963.5
Adult Thoracic-Abdominal Ganglion
2260.7
Adult Crop
8.7
Adult Midgut
8.6
Adult Hindgut
8.3
Adult Malpighian Tubules
5.4
Adult Fat Body
16
Adult Salivary Gland
22
Adult Heart
11.35
Adult VirginFemale Spermatheca
10.9
Adult InseminatedFemale Spermatheca
10.8
Adult Ovary
2.9
Adult Testis
2.1
Adult Male Accessory Gland
9.3
Adult Carcass
45
Expression Level Scale
Very high
log, scaled to maximum expression level
Tissue
Expression Level
Larval Central Nervous System
743.525
Larval Midgut
11.5
Larval Hindgut
5.8
Larval Malpighian Tubules
2.8
Larval Fat Body
5
Larval Salivary Gland
7.3
Larval Trachea
16.425
Larval Carcass
11.225
Adult Head
656
Adult Eye
1047
Adult Brain
1963.5
Adult Thoracic-Abdominal Ganglion
2260.7
Adult Crop
8.7
Adult Midgut
8.6
Adult Hindgut
8.3
Adult Malpighian Tubules
5.4
Adult Fat Body
16
Adult Salivary Gland
22
Adult Heart
11.35
Adult VirginFemale Spermatheca
10.9
Adult InseminatedFemale Spermatheca
10.8
Adult Ovary
2.9
Adult Testis
2.1
Adult Male Accessory Gland
9.3
Adult Carcass
45
Expression Level Scale
None
Low
Moderate
High
Very high
log, scaled to Moderate expression
Tissue
Expression Level
Larval Central Nervous System
743.525
Larval Midgut
11.5
Larval Hindgut
5.8
Larval Malpighian Tubules
2.8
Larval Fat Body
5
Larval Salivary Gland
7.3
Larval Trachea
16.425
Larval Carcass
11.225
Adult Head
656
Adult Eye
(1047)
Adult Brain
(1963.5)
Adult Thoracic-Abdominal Ganglion
(2260.7)
Adult Crop
8.7
Adult Midgut
8.6
Adult Hindgut
8.3
Adult Malpighian Tubules
5.4
Adult Fat Body
16
Adult Salivary Gland
22
Adult Heart
11.35
Adult VirginFemale Spermatheca
10.9
Adult InseminatedFemale Spermatheca
10.8
Adult Ovary
2.9
Adult Testis
2.1
Adult Male Accessory Gland
9.3
Adult Carcass
45
Expression Level Scale
None
Low
Moderate
High
log, scaled to High level expression
Tissue
Expression Level
Larval Central Nervous System
743.525
Larval Midgut
11.5
Larval Hindgut
5.8
Larval Malpighian Tubules
2.8
Larval Fat Body
5
Larval Salivary Gland
7.3
Larval Trachea
16.425
Larval Carcass
11.225
Adult Head
656
Adult Eye
1047
Adult Brain
(1963.5)
Adult Thoracic-Abdominal Ganglion
(2260.7)
Adult Crop
8.7
Adult Midgut
8.6
Adult Hindgut
8.3
Adult Malpighian Tubules
5.4
Adult Fat Body
16
Adult Salivary Gland
22
Adult Heart
11.35
Adult VirginFemale Spermatheca
10.9
Adult InseminatedFemale Spermatheca
10.8
Adult Ovary
2.9
Adult Testis
2.1
Adult Male Accessory Gland
9.3
Adult Carcass
45
Expression Level Scale
None
Low
Moderate
High
Very high
log, scaled to Very high expression
Tissue
Expression Level
Larval Central Nervous System
743.525
Larval Midgut
11.5
Larval Hindgut
5.8
Larval Malpighian Tubules
2.8
Larval Fat Body
5
Larval Salivary Gland
7.3
Larval Trachea
16.425
Larval Carcass
11.225
Adult Head
656
Adult Eye
1047
Adult Brain
1963.5
Adult Thoracic-Abdominal Ganglion
2260.7
Adult Crop
8.7
Adult Midgut
8.6
Adult Hindgut
8.3
Adult Malpighian Tubules
5.4
Adult Fat Body
16
Adult Salivary Gland
22
Adult Heart
11.35
Adult VirginFemale Spermatheca
10.9
Adult InseminatedFemale Spermatheca
10.8
Adult Ovary
2.9
Adult Testis
2.1
Adult Male Accessory Gland
9.3
Adult Carcass
45
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 18-24 hour embryonic stages. This gene is annotated by FlyBase as a dicistronic gene, meaning that some or all of its transcripts encode two or more polypeptide-coding open reading frames (ORFs) , with each ORF assigned to a different gene. The distribution of RNA-Seq coverage data amongst the different encoded genes cannot be determined.
[download data (TSV)]
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.
One or more of the processed transcripts for this gene contain(s) two non-overlapping open reading frames (ORFs). The non-overlapping ORFs are represented by stnA and stnB.
Rescue analysis suggests that the stnB open reading frame (ORF) encodes all vital and important functions of the dicistronic "stn" locus and that the stnA ORF encodes a dispensible protein. However, this interpretation is limited by the absence of a true null for "stn" due to partial rescue of presynaptic stnA protein by transgenically provided stnB protein.
Neuronal expression of a dicistronic "stn" transcript (encoding both stnA and stnB proteins) is sufficient to rescue various phenotypic defects of "stn" mutants, including lethality and defects in evoked transmitter release and syt protein localisation at the nerve terminals. In addition, neural expression of a monocistronic stnB transgene is sufficient to rescue all these defects. In contrast, neural expression of a monocistronic stnA transgene does not rescue any of the "stn" mutant phenotypes. In addition, "stn" is required for regulating normal growth and morphology of the motor terminal, and this function is also provided by a monocistronic stnB transgene.
"stn" mutants show a striking decrease in the size of the endo-exo-cycling synaptic vesicle pool and loss of spatial regulation of the vesicular recycling intermediates. Mutant synapses display a significant delay in vesicular membrane retrieval after depolarisation and neurotransmitter release.
Expression analysis suggests that mutation in the first open reading frame, stnA, of the stoned dicistronic transcript renders the second reading frame, stnB, unreadable.
The stnA and stnB proteins are essential for the recycling of synaptic vesicle membrane and are required for the proper sorting of the syt gene product during endocytosis.
The 'stoned' locus produces a dicistronic transcript and encodes two distinct polypeptides. The structure of the protein encoded by the stnB ORF suggests a possible role in membrane trafficking, allowing an interpretation of the interaction seen between temperature sensitive 'stoned' and shi mutants.