The gene Netrin-B is referred to in FlyBase by the symbol Dmel\NetB (CG10521, FBgn0015774). 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: motor neuron axon guidance; synaptic target recognition; salivary gland boundary specification; axon guidance; glial cell migration; regulation of photoreceptor cell axon guidance; dendrite guidance. 32 alleles are reported. The phenotypes of these alleles are annotated with: organ system subdivision; organ system; peripheral nervous system; adult segment; multicellular structure; cell part; adult; external compound sense organ; embryonic foregut; non-connected developing system; larval abdominal segment; axon. It has 7 annotated transcripts and 7 annotated polypeptides. Protein features are: EGF-like, laminin; Laminin, N-terminal; Netrin domain; Netrin module, non-TIMP type; Tissue inhibitor of metalloproteinases-like, OB-fold. Summary of modENCODE Temporal Expression Profile: Temporal profile ranges from a peak of moderate expression to a trough of very low expression. Peak expression observed at stages throughout embryogenesis, during early larval stages, at stages throughout the pupal period. Summary of FlyAtlas Anatomical Expression Data: Expression at high levels in the following post-embryonic organs or tissues: larval/adult central nervous system. Expression at moderate levels in the following post-embryonic organs or tissues: adult head, adult eye. Comments on Affy2 ProbeSet: ProbeSet 1636954_at completely aligns to an exonic region common to each of the 4 FlyBase-annotated transcript isoforms of NetB. Gene sequence location is X:14580071..14643409.
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NetB RNA is first detected in the developing CNS in early stage 12 embryos at which time it is observed in a subset of the cells along the midline and in a few cells lateral to the midline. In mid stage 12, expression decreases in the lateral cells and increases in the midline cells. By stage 13, it appears that the midline expression is limited to the midline glia. Midline expression continues to the end of embryogenesis.
NetB expression is first observed at the cellular blastoderm stage in the presumptive mesoderm and persists there through gastrulation and then fades. It continues to be expressed weakly in the visceral mesoderm and in small patches in the somatic mesoderm. NetB is expressed strongly in the ventral midline at stage 12 and 13 in the midline glia. It is also expressed in a dynamic pattern in subsets of CNS neurons and is expressed in many more neurons than is NetA. Among these are the MP neurons. NetB is expressed by dorsal muscle and by ventral muscles 6 and 7. It is expressed transiently at stages 13 and 14 in the embryonic precursors of the wing and haltere discs. Finally it is expressed in many cells in the brain and in some epidermal structures in the head that may be imaginal discs.
NetB protein is expressed in the CNS starting in stage 12. It is first observed in cells just lateral to the midline and accumulates in midline cells by late stage 12. A variable degree of axon accumulation is observed starting in stage 12. At stage 14, a lateral group of neurons begins to express NetB. NetB expression is first observed in the developing mesoderm during germ band extension. Expression continues in a variety of mesoderm derivatives including the visceral mesoderm, the somatic mesoderm, and the dorsal vessel. Expressio is observed in the developing stomatogastric nervous system in stage 13. During stage 14, expression is apparent in imaginal disc primordia, including cells that will give rise to the eye-antennal, labial, wing, haltere, and genital discs. NetB protein accumulates in the developing PNS, including the chordotonal organs, and in muscles of both the dorsal and ventral groups. Earlier expression is seen in subsets of muscles. Later, expression is seen on motor axons as they synapse with these specific muscle groups.
Summary of FlyAtlas Anatomical Expression Data: Expression at high levels in the following post-embryonic organs or tissues: larval/adult central nervous system. Expression at moderate levels in the following post-embryonic organs or tissues: adult head, adult eye.
[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
782.8
Larval Midgut
14.2
Larval Hindgut
26.4
Larval Malpighian Tubules
53.8
Larval Fat Body
68.1
Larval Salivary Gland
8.1
Larval Trachea
43.2
Larval Carcass
46.7
Adult Head
149.2
Adult Eye
120.6
Adult Brain
628.3
Adult Thoracic-Abdominal Ganglion
588.1
Adult Crop
24.8
Adult Midgut
37.8
Adult Hindgut
49.4
Adult Malpighian Tubules
11.6
Adult Fat Body
29.8
Adult Salivary Gland
19.5
Adult Heart
59.025
Adult VirginFemale Spermatheca
39.1
Adult InseminatedFemale Spermatheca
50.5
Adult Ovary
9.9
Adult Testis
8.9
Adult Male Accessory Gland
17.6
Adult Carcass
32.9
Expression Level Scale
None
Low
Moderate
High
Linear, scaled to Moderate expression
Tissue
Expression Level
Larval Central Nervous System
(782.8)
Larval Midgut
14.2
Larval Hindgut
26.4
Larval Malpighian Tubules
53.8
Larval Fat Body
68.1
Larval Salivary Gland
8.1
Larval Trachea
43.2
Larval Carcass
46.7
Adult Head
149.2
Adult Eye
120.6
Adult Brain
(628.3)
Adult Thoracic-Abdominal Ganglion
(588.1)
Adult Crop
24.8
Adult Midgut
37.8
Adult Hindgut
49.4
Adult Malpighian Tubules
11.6
Adult Fat Body
29.8
Adult Salivary Gland
19.5
Adult Heart
59.025
Adult VirginFemale Spermatheca
39.1
Adult InseminatedFemale Spermatheca
50.5
Adult Ovary
9.9
Adult Testis
8.9
Adult Male Accessory Gland
17.6
Adult Carcass
32.9
Expression Level Scale
None
Low
Moderate
High
Linear, scaled to High level expression
Tissue
Expression Level
Larval Central Nervous System
782.8
Larval Midgut
14.2
Larval Hindgut
26.4
Larval Malpighian Tubules
53.8
Larval Fat Body
68.1
Larval Salivary Gland
8.1
Larval Trachea
43.2
Larval Carcass
46.7
Adult Head
149.2
Adult Eye
120.6
Adult Brain
628.3
Adult Thoracic-Abdominal Ganglion
588.1
Adult Crop
24.8
Adult Midgut
37.8
Adult Hindgut
49.4
Adult Malpighian Tubules
11.6
Adult Fat Body
29.8
Adult Salivary Gland
19.5
Adult Heart
59.025
Adult VirginFemale Spermatheca
39.1
Adult InseminatedFemale Spermatheca
50.5
Adult Ovary
9.9
Adult Testis
8.9
Adult Male Accessory Gland
17.6
Adult Carcass
32.9
Expression Level Scale
None
Low
Moderate
High
Very high
Linear, scaled to Very high expression
Tissue
Expression Level
Larval Central Nervous System
782.8
Larval Midgut
14.2
Larval Hindgut
26.4
Larval Malpighian Tubules
53.8
Larval Fat Body
68.1
Larval Salivary Gland
8.1
Larval Trachea
43.2
Larval Carcass
46.7
Adult Head
149.2
Adult Eye
120.6
Adult Brain
628.3
Adult Thoracic-Abdominal Ganglion
588.1
Adult Crop
24.8
Adult Midgut
37.8
Adult Hindgut
49.4
Adult Malpighian Tubules
11.6
Adult Fat Body
29.8
Adult Salivary Gland
19.5
Adult Heart
59.025
Adult VirginFemale Spermatheca
39.1
Adult InseminatedFemale Spermatheca
50.5
Adult Ovary
9.9
Adult Testis
8.9
Adult Male Accessory Gland
17.6
Adult Carcass
32.9
Expression Level Scale
Very high
log, scaled to maximum expression level
Tissue
Expression Level
Larval Central Nervous System
782.8
Larval Midgut
14.2
Larval Hindgut
26.4
Larval Malpighian Tubules
53.8
Larval Fat Body
68.1
Larval Salivary Gland
8.1
Larval Trachea
43.2
Larval Carcass
46.7
Adult Head
149.2
Adult Eye
120.6
Adult Brain
628.3
Adult Thoracic-Abdominal Ganglion
588.1
Adult Crop
24.8
Adult Midgut
37.8
Adult Hindgut
49.4
Adult Malpighian Tubules
11.6
Adult Fat Body
29.8
Adult Salivary Gland
19.5
Adult Heart
59.025
Adult VirginFemale Spermatheca
39.1
Adult InseminatedFemale Spermatheca
50.5
Adult Ovary
9.9
Adult Testis
8.9
Adult Male Accessory Gland
17.6
Adult Carcass
32.9
Expression Level Scale
None
Low
Moderate
High
Very high
log, scaled to Moderate expression
Tissue
Expression Level
Larval Central Nervous System
782.8
Larval Midgut
14.2
Larval Hindgut
26.4
Larval Malpighian Tubules
53.8
Larval Fat Body
68.1
Larval Salivary Gland
8.1
Larval Trachea
43.2
Larval Carcass
46.7
Adult Head
149.2
Adult Eye
120.6
Adult Brain
628.3
Adult Thoracic-Abdominal Ganglion
588.1
Adult Crop
24.8
Adult Midgut
37.8
Adult Hindgut
49.4
Adult Malpighian Tubules
11.6
Adult Fat Body
29.8
Adult Salivary Gland
19.5
Adult Heart
59.025
Adult VirginFemale Spermatheca
39.1
Adult InseminatedFemale Spermatheca
50.5
Adult Ovary
9.9
Adult Testis
8.9
Adult Male Accessory Gland
17.6
Adult Carcass
32.9
Expression Level Scale
None
Low
Moderate
High
log, scaled to High level expression
Tissue
Expression Level
Larval Central Nervous System
782.8
Larval Midgut
14.2
Larval Hindgut
26.4
Larval Malpighian Tubules
53.8
Larval Fat Body
68.1
Larval Salivary Gland
8.1
Larval Trachea
43.2
Larval Carcass
46.7
Adult Head
149.2
Adult Eye
120.6
Adult Brain
628.3
Adult Thoracic-Abdominal Ganglion
588.1
Adult Crop
24.8
Adult Midgut
37.8
Adult Hindgut
49.4
Adult Malpighian Tubules
11.6
Adult Fat Body
29.8
Adult Salivary Gland
19.5
Adult Heart
59.025
Adult VirginFemale Spermatheca
39.1
Adult InseminatedFemale Spermatheca
50.5
Adult Ovary
9.9
Adult Testis
8.9
Adult Male Accessory Gland
17.6
Adult Carcass
32.9
Expression Level Scale
None
Low
Moderate
High
Very high
log, scaled to Very high expression
Tissue
Expression Level
Larval Central Nervous System
782.8
Larval Midgut
14.2
Larval Hindgut
26.4
Larval Malpighian Tubules
53.8
Larval Fat Body
68.1
Larval Salivary Gland
8.1
Larval Trachea
43.2
Larval Carcass
46.7
Adult Head
149.2
Adult Eye
120.6
Adult Brain
628.3
Adult Thoracic-Abdominal Ganglion
588.1
Adult Crop
24.8
Adult Midgut
37.8
Adult Hindgut
49.4
Adult Malpighian Tubules
11.6
Adult Fat Body
29.8
Adult Salivary Gland
19.5
Adult Heart
59.025
Adult VirginFemale Spermatheca
39.1
Adult InseminatedFemale Spermatheca
50.5
Adult Ovary
9.9
Adult Testis
8.9
Adult Male Accessory Gland
17.6
Adult Carcass
32.9
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 moderate expression to a trough of very low expression. Peak expression observed at stages throughout embryogenesis, during early larval stages, at stages throughout the pupal period.
[download data (TSV)]
Please Note FlyBase no
longer curates genomic clone accessions so this list
may not be complete
cDNA Clones ( 108 )
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.
NetA and NetB function as short-range target recognition molecules for specific motoneurons. The relative balance of Sema-2a and the Netrins controls the choice of a specific target and the avoidance of a potential target. NetB and Sema-2a can both be repulsive for certain motor axons. fra is required for Netrin-mediated attraction, but not repulsion.
NetA and NetB are expressed by subsets of muscles and function in motor axon targetting. Ectopic expression and loss of function analysis in both the CNS and periphery demonstrates the pattern of netrin expression is crucial to correct patterning of axons, providing evidence that Netrins function as instructive rather than simply permissive, guidance cues.
Hazelett et al., 2012, G3 (Bethesda) 2(7): 789--802
Comparison of Parallel High-Throughput RNA Sequencing Between Knockout of TDP-43 and Its Overexpression Reveals Primarily Nonreciprocal and Nonoverlapping Gene Expression Changes in the Central Nervous System of Drosophila. [FBrf0219102]
Manning et al., 2012, Cell Rep. 2(4): 1002--1013
A Resource for Manipulating Gene Expression and Analyzing cis-Regulatory Modules in the Drosophila CNS. [FBrf0219785]
Tan et al., 2012, PLoS Genet. 8(5): e1002681
MicroRNA-277 Modulates the Neurodegeneration Caused by Fragile X Premutation rCGG Repeats. [FBrf0218227]
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]
Albrecht et al., 2011, Dev. Biol. 350(1): 89--100
The transmembrane receptor Uncoordinated5 (Unc5) is essential for heart lumen formation in Drosophila melanogaster. [FBrf0212758]
Kuzina et al., 2011, Development 138(9): 1839--1849
How Notch establishes longitudinal axon connections between successive segments of the Drosophila CNS. [FBrf0213493]
Matthews and Grueber, 2011, Curr. Biol. 21(17): 1480--1487
Dscam1-mediated self-avoidance counters netrin-dependent targeting of dendrites in Drosophila. [FBrf0215596]
Morikawa et al., 2011, Proc. Natl. Acad. Sci. U.S.A. 108(48): 19389--19394
Different levels of the Tripartite motif protein, Anomalies in sensory axon patterning (Asap), regulate distinct axonal projections of Drosophila sensory neurons. [FBrf0216734]
Pruteanu-Malinici et al., 2011, PLoS Comput. Biol. 7(7): e1002098
Automatic Annotation of Spatial Expression Patterns via Sparse Bayesian Factor Models. [FBrf0214618]