The gene brachyenteron is referred to in FlyBase by the symbol Dmel\byn (CG7260, FBgn0011723). It is a protein_coding_gene from Drosophila melanogaster. There is experimental evidence that it has the molecular function: sequence-specific DNA binding RNA polymerase II transcription factor activity; protein homodimerization activity. There is experimental evidence that it is involved in the biological process: hindgut morphogenesis; Malpighian tubule morphogenesis; positive regulation of transcription from RNA polymerase II promoter; midgut development. 14 alleles are reported. The phenotypes of these alleles are annotated with: organ system; multicellular structure; non-connected developing system; anatomical structure; portion of tissue; extended germ band embryo; organ system subdivision; ISN innervated muscle of A1-7; ectoderm derivative; late extended germ band embryo. It has 2 annotated transcripts and 2 annotated polypeptides. Protein features are: Transcription factor, Brachyury; Transcription factor, T-box; Transcription factor, T-box, conserved site; p53-like transcription factor, DNA-binding. 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 00-06 hour embryonic stages. Summary of FlyAtlas Anatomical Expression Data: Expression at high levels in the following post-embryonic organs or tissues: adult hindgut. Expression at moderate levels in the following post-embryonic organs or tissues: larval hindgut. Comments on Affy2 ProbeSet: ProbeSet 1639885_at completely aligns to an exonic region of the only FlyBase-annotated transcript isoform of byn. Gene sequence location is 3L:11920793..11929019.
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FB2013_03
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Transcription of byn commences at the beginning of embryonic cycle 14 in the posterior terminal region from 0-20% egg length. During cellularization, transcripts recede from the pole and become confined to a ring of cells of which the ventral cells form the posterior part of the ventral furrow, while the dorsal and lateral cells form the primordia of the proctodeum and anal pads. The dorsal and lateral cells are internalized by the amnioproctodeal invagination during gastrulation. The proctodeum continues to express byn during germ band extension. Expression is maintained in the hindgut and anal pads until the end of embryogenesis.
byn protein is first detected in the blastoderm in a ring of cells mostly comprising the proctodeal primordium and in the primordia of the anal pads and the hindgut. During germ band extension, the protein is confined to the proctodeum. In the fully retracted germ band, it is found in the hindgut and anal pads.
Summary of FlyAtlas Anatomical Expression Data: Expression at high levels in the following post-embryonic organs or tissues: adult hindgut. Expression at moderate levels in the following post-embryonic organs or tissues: larval hindgut.
[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
4.2
Larval Midgut
6
Larval Hindgut
351
Larval Malpighian Tubules
9.8
Larval Fat Body
21
Larval Salivary Gland
6.4
Larval Trachea
3.7
Larval Carcass
13.725
Adult Head
4.3
Adult Eye
2.075
Adult Brain
4.5
Adult Thoracic-Abdominal Ganglion
4.1
Adult Crop
6.3
Adult Midgut
7.9
Adult Hindgut
548.3
Adult Malpighian Tubules
11.4
Adult Fat Body
7
Adult Salivary Gland
7
Adult Heart
3.1
Adult VirginFemale Spermatheca
11.1
Adult InseminatedFemale Spermatheca
7.5
Adult Ovary
3.5
Adult Testis
6.2
Adult Male Accessory Gland
14.2
Adult Carcass
8.3
Expression Level Scale
None
Low
Moderate
High
Linear, scaled to Moderate expression
Tissue
Expression Level
Larval Central Nervous System
4.2
Larval Midgut
6
Larval Hindgut
351
Larval Malpighian Tubules
9.8
Larval Fat Body
21
Larval Salivary Gland
6.4
Larval Trachea
3.7
Larval Carcass
13.725
Adult Head
4.3
Adult Eye
2.075
Adult Brain
4.5
Adult Thoracic-Abdominal Ganglion
4.1
Adult Crop
6.3
Adult Midgut
7.9
Adult Hindgut
(548.3)
Adult Malpighian Tubules
11.4
Adult Fat Body
7
Adult Salivary Gland
7
Adult Heart
3.1
Adult VirginFemale Spermatheca
11.1
Adult InseminatedFemale Spermatheca
7.5
Adult Ovary
3.5
Adult Testis
6.2
Adult Male Accessory Gland
14.2
Adult Carcass
8.3
Expression Level Scale
None
Low
Moderate
High
Linear, scaled to High level expression
Tissue
Expression Level
Larval Central Nervous System
4.2
Larval Midgut
6
Larval Hindgut
351
Larval Malpighian Tubules
9.8
Larval Fat Body
21
Larval Salivary Gland
6.4
Larval Trachea
3.7
Larval Carcass
13.725
Adult Head
4.3
Adult Eye
2.075
Adult Brain
4.5
Adult Thoracic-Abdominal Ganglion
4.1
Adult Crop
6.3
Adult Midgut
7.9
Adult Hindgut
548.3
Adult Malpighian Tubules
11.4
Adult Fat Body
7
Adult Salivary Gland
7
Adult Heart
3.1
Adult VirginFemale Spermatheca
11.1
Adult InseminatedFemale Spermatheca
7.5
Adult Ovary
3.5
Adult Testis
6.2
Adult Male Accessory Gland
14.2
Adult Carcass
8.3
Expression Level Scale
None
Low
Moderate
High
Very high
Linear, scaled to Very high expression
Tissue
Expression Level
Larval Central Nervous System
4.2
Larval Midgut
6
Larval Hindgut
351
Larval Malpighian Tubules
9.8
Larval Fat Body
21
Larval Salivary Gland
6.4
Larval Trachea
3.7
Larval Carcass
13.725
Adult Head
4.3
Adult Eye
2.075
Adult Brain
4.5
Adult Thoracic-Abdominal Ganglion
4.1
Adult Crop
6.3
Adult Midgut
7.9
Adult Hindgut
548.3
Adult Malpighian Tubules
11.4
Adult Fat Body
7
Adult Salivary Gland
7
Adult Heart
3.1
Adult VirginFemale Spermatheca
11.1
Adult InseminatedFemale Spermatheca
7.5
Adult Ovary
3.5
Adult Testis
6.2
Adult Male Accessory Gland
14.2
Adult Carcass
8.3
Expression Level Scale
Very high
log, scaled to maximum expression level
Tissue
Expression Level
Larval Central Nervous System
4.2
Larval Midgut
6
Larval Hindgut
351
Larval Malpighian Tubules
9.8
Larval Fat Body
21
Larval Salivary Gland
6.4
Larval Trachea
3.7
Larval Carcass
13.725
Adult Head
4.3
Adult Eye
2.075
Adult Brain
4.5
Adult Thoracic-Abdominal Ganglion
4.1
Adult Crop
6.3
Adult Midgut
7.9
Adult Hindgut
548.3
Adult Malpighian Tubules
11.4
Adult Fat Body
7
Adult Salivary Gland
7
Adult Heart
3.1
Adult VirginFemale Spermatheca
11.1
Adult InseminatedFemale Spermatheca
7.5
Adult Ovary
3.5
Adult Testis
6.2
Adult Male Accessory Gland
14.2
Adult Carcass
8.3
Expression Level Scale
None
Low
Moderate
High
Very high
log, scaled to Moderate expression
Tissue
Expression Level
Larval Central Nervous System
4.2
Larval Midgut
6
Larval Hindgut
351
Larval Malpighian Tubules
9.8
Larval Fat Body
21
Larval Salivary Gland
6.4
Larval Trachea
3.7
Larval Carcass
13.725
Adult Head
4.3
Adult Eye
2.075
Adult Brain
4.5
Adult Thoracic-Abdominal Ganglion
4.1
Adult Crop
6.3
Adult Midgut
7.9
Adult Hindgut
548.3
Adult Malpighian Tubules
11.4
Adult Fat Body
7
Adult Salivary Gland
7
Adult Heart
3.1
Adult VirginFemale Spermatheca
11.1
Adult InseminatedFemale Spermatheca
7.5
Adult Ovary
3.5
Adult Testis
6.2
Adult Male Accessory Gland
14.2
Adult Carcass
8.3
Expression Level Scale
None
Low
Moderate
High
log, scaled to High level expression
Tissue
Expression Level
Larval Central Nervous System
4.2
Larval Midgut
6
Larval Hindgut
351
Larval Malpighian Tubules
9.8
Larval Fat Body
21
Larval Salivary Gland
6.4
Larval Trachea
3.7
Larval Carcass
13.725
Adult Head
4.3
Adult Eye
2.075
Adult Brain
4.5
Adult Thoracic-Abdominal Ganglion
4.1
Adult Crop
6.3
Adult Midgut
7.9
Adult Hindgut
548.3
Adult Malpighian Tubules
11.4
Adult Fat Body
7
Adult Salivary Gland
7
Adult Heart
3.1
Adult VirginFemale Spermatheca
11.1
Adult InseminatedFemale Spermatheca
7.5
Adult Ovary
3.5
Adult Testis
6.2
Adult Male Accessory Gland
14.2
Adult Carcass
8.3
Expression Level Scale
None
Low
Moderate
High
Very high
log, scaled to Very high expression
Tissue
Expression Level
Larval Central Nervous System
4.2
Larval Midgut
6
Larval Hindgut
351
Larval Malpighian Tubules
9.8
Larval Fat Body
21
Larval Salivary Gland
6.4
Larval Trachea
3.7
Larval Carcass
13.725
Adult Head
4.3
Adult Eye
2.075
Adult Brain
4.5
Adult Thoracic-Abdominal Ganglion
4.1
Adult Crop
6.3
Adult Midgut
7.9
Adult Hindgut
548.3
Adult Malpighian Tubules
11.4
Adult Fat Body
7
Adult Salivary Gland
7
Adult Heart
3.1
Adult VirginFemale Spermatheca
11.1
Adult InseminatedFemale Spermatheca
7.5
Adult Ovary
3.5
Adult Testis
6.2
Adult Male Accessory Gland
14.2
Adult Carcass
8.3
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 moderately high expression to a trough of very low expression. Peak expression observed within 00-06 hour embryonic stages.
[download data (TSV)]
Please Note FlyBase no
longer curates genomic clone accessions so this list
may not be complete
cDNA Clones ( 3 )
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 mutant phenotype and the similarity of the encoded gene product to the vertebrate Brachyury protein caused the gene named to be changed from "Trg" to "brachyenteron" ("byn"), or "short gut".
byn, supported by fkh, mediates the early specification of the caudal visceral mesoderm along with zfh1. The functions of byn in the mesoderm of Drosophila are comparable to the roles of the vertebrate Brachyury genes during gastrulation.
cad acts in hindgut development through fog, fkh and wg, but does not play a role in activating tll, hkb, byn and bowl which are also required for proper hindgut development. cad, fkh, byn and wg constitute a conserved constellation of genes that plays a required role in gastrulation and gut development.
Phenotypic analysis demonstrates byn is required to regulate specific gene activity in the primordia of the anal pads and hindgut. In the absence of byn activity, programmed cell death occurs in the primordia resulting in reduced and abnormal anal pads and hindgut. byn is also required for the formation of midgut restrictions and elongation of the Malpighian tubules. tll is necessary and sufficient to activate byn.
Hamaguchi et al., 2012, Mech. Dev. 129(9-12): 236--243
Dorsoventral patterning of the Drosophila hindgut is determined by interaction of genes under the control of two independent gene regulatory systems, the dorsal and terminal systems. [FBrf0219771]
Uddin et al., 2011, Int. J. Dev. Biol. 55(10-11-12): 945--952
The drumstick gene acts cell-non-autonomously and triggers specification of the small intestine in the Drosophila hindgut. [FBrf0217187]