The gene Bearded is referred to in FlyBase by the symbol Dmel\Brd (CG3096, FBgn0000216). 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: Notch signaling pathway; sensory organ development; cell fate specification. 36 alleles are reported. The phenotypes of these alleles are annotated with: organ system subdivision; sensillum; external compound sense organ; adult segment; adult mesothoracic segment; peripheral nervous system; compound cell cluster organ; nervous system; sensillum trichodeum; dorsocentral bristle; wing margin bristle; mesothoracic preepisternum. It has one annotated transcript and one annotated polypeptide. Summary of modENCODE Temporal Expression Profile: Temporal profile ranges from a peak of very high expression to a trough of no expression detected. Peak expression observed within 00-12 hour embryonic stages. Summary of FlyAtlas Anatomical Expression Data: Expression at moderate levels in the following post-embryonic organs or tissues: larval central nervous system. Comments on Affy2 ProbeSet: ProbeSet 1636672_at completely aligns to an exonic region of the only FlyBase-annotated transcript isoform of Brd. Gene sequence location is 3L:14965767..14966298.
User Contributed Data
External Summaries
Phenotypic Description from the Red Book (Lindsley
& Zimm 1992)
Gene/Allele symbols may differ
from current usage
Brd: Bearded (M. Leviten)
Causes production of supernumerary chaetae and sensilla at or near normal positions. Brd1 homozygotes survive
and exhibit more severe phenotypes than heterozygotes. Brd1/+
= Brd1/Df(3L)Brd. Brd alleles affect all classes of adult
sensory organs. Brd1 strongly affects macrochaetae and other
imaginal-disc sensilla (i.e., trichoid, campaniform, basiconic), but only mildly increases microchaete density. Brd3
and other alleles produce more severe microchaete phenotypes,
in both disc and histoblast derived tissues, as well as exhibiting the Brd1 phenotypes. In addition to sensillum multiplication, Brd1 homozygotes also exhibit bristle loss, with
anterior orbitals absent (>90%) and a less frequent loss of
ocellar macrochaetae (<5%). This bristle loss occurs in other
Brd genotypes and is most severe for Brd3 homozygotes. The
combination of sensilla multiplication and loss phenotypes is
made more severe by loss-of-function mutations at Notch and
neuralized, and are decreased in the presence of three wild type copies of these genes. The ethyl-methanesulfonate-induced point revertants of Brd1 tested (Brdrv1-4) are homozygous viable, viable in trans to Brd deficiencies, and display
no mutant phenotypes in either situation.
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Brd transcripts are detected in third instar larval eye discs in the morphogenetic furrow in closely spaced stripes, one anterior to the stripe of dpp staining in the furrow and one within the furrow and posterior to it. They are detected in the pupal wing at 8h APF in large clusters of proximal campaniform sensilla.
Brd transcripts are detected weakly in preblastoderm embryos, are abundant in 4-8hr embryos and drop off dramatically in later embryonic stages on northern blots. Brd is expressed specifically in proneural clusters in the imaginal discs. In the wing imaginal disc, it is present at the positions of all developing adult external sensory organs. Further, it was found that Brd expression precedes sensory organ precursor specification.
Summary of FlyAtlas Anatomical Expression Data: Expression at moderate levels in the following post-embryonic organs or tissues: larval 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
204.875
Larval Midgut
15.2
Larval Hindgut
11.3
Larval Malpighian Tubules
5.9
Larval Fat Body
10.5
Larval Salivary Gland
9.7
Larval Trachea
12.675
Larval Carcass
57.175
Adult Head
8.1
Adult Eye
5.925
Adult Brain
4
Adult Thoracic-Abdominal Ganglion
11.1
Adult Crop
15.2
Adult Midgut
12.1
Adult Hindgut
11.9
Adult Malpighian Tubules
5.5
Adult Fat Body
14
Adult Salivary Gland
29.8
Adult Heart
2.95
Adult VirginFemale Spermatheca
12.3
Adult InseminatedFemale Spermatheca
11
Adult Ovary
4.6
Adult Testis
1.6
Adult Male Accessory Gland
15.6
Adult Carcass
10.7
Expression Level Scale
None
Low
Moderate
Linear, scaled to Moderate expression
Tissue
Expression Level
Larval Central Nervous System
204.875
Larval Midgut
15.2
Larval Hindgut
11.3
Larval Malpighian Tubules
5.9
Larval Fat Body
10.5
Larval Salivary Gland
9.7
Larval Trachea
12.675
Larval Carcass
57.175
Adult Head
8.1
Adult Eye
5.925
Adult Brain
4
Adult Thoracic-Abdominal Ganglion
11.1
Adult Crop
15.2
Adult Midgut
12.1
Adult Hindgut
11.9
Adult Malpighian Tubules
5.5
Adult Fat Body
14
Adult Salivary Gland
29.8
Adult Heart
2.95
Adult VirginFemale Spermatheca
12.3
Adult InseminatedFemale Spermatheca
11
Adult Ovary
4.6
Adult Testis
1.6
Adult Male Accessory Gland
15.6
Adult Carcass
10.7
Expression Level Scale
None
Low
Moderate
High
Linear, scaled to High level expression
Tissue
Expression Level
Larval Central Nervous System
204.875
Larval Midgut
15.2
Larval Hindgut
11.3
Larval Malpighian Tubules
5.9
Larval Fat Body
10.5
Larval Salivary Gland
9.7
Larval Trachea
12.675
Larval Carcass
57.175
Adult Head
8.1
Adult Eye
5.925
Adult Brain
4
Adult Thoracic-Abdominal Ganglion
11.1
Adult Crop
15.2
Adult Midgut
12.1
Adult Hindgut
11.9
Adult Malpighian Tubules
5.5
Adult Fat Body
14
Adult Salivary Gland
29.8
Adult Heart
2.95
Adult VirginFemale Spermatheca
12.3
Adult InseminatedFemale Spermatheca
11
Adult Ovary
4.6
Adult Testis
1.6
Adult Male Accessory Gland
15.6
Adult Carcass
10.7
Expression Level Scale
None
Low
Moderate
High
Very high
Linear, scaled to Very high expression
Tissue
Expression Level
Larval Central Nervous System
204.875
Larval Midgut
15.2
Larval Hindgut
11.3
Larval Malpighian Tubules
5.9
Larval Fat Body
10.5
Larval Salivary Gland
9.7
Larval Trachea
12.675
Larval Carcass
57.175
Adult Head
8.1
Adult Eye
5.925
Adult Brain
4
Adult Thoracic-Abdominal Ganglion
11.1
Adult Crop
15.2
Adult Midgut
12.1
Adult Hindgut
11.9
Adult Malpighian Tubules
5.5
Adult Fat Body
14
Adult Salivary Gland
29.8
Adult Heart
2.95
Adult VirginFemale Spermatheca
12.3
Adult InseminatedFemale Spermatheca
11
Adult Ovary
4.6
Adult Testis
1.6
Adult Male Accessory Gland
15.6
Adult Carcass
10.7
Expression Level Scale
Very high
log, scaled to maximum expression level
Tissue
Expression Level
Larval Central Nervous System
204.875
Larval Midgut
15.2
Larval Hindgut
11.3
Larval Malpighian Tubules
5.9
Larval Fat Body
10.5
Larval Salivary Gland
9.7
Larval Trachea
12.675
Larval Carcass
57.175
Adult Head
8.1
Adult Eye
5.925
Adult Brain
4
Adult Thoracic-Abdominal Ganglion
11.1
Adult Crop
15.2
Adult Midgut
12.1
Adult Hindgut
11.9
Adult Malpighian Tubules
5.5
Adult Fat Body
14
Adult Salivary Gland
29.8
Adult Heart
2.95
Adult VirginFemale Spermatheca
12.3
Adult InseminatedFemale Spermatheca
11
Adult Ovary
4.6
Adult Testis
1.6
Adult Male Accessory Gland
15.6
Adult Carcass
10.7
Expression Level Scale
None
Low
Moderate
log, scaled to Moderate expression
Tissue
Expression Level
Larval Central Nervous System
204.875
Larval Midgut
15.2
Larval Hindgut
11.3
Larval Malpighian Tubules
5.9
Larval Fat Body
10.5
Larval Salivary Gland
9.7
Larval Trachea
12.675
Larval Carcass
57.175
Adult Head
8.1
Adult Eye
5.925
Adult Brain
4
Adult Thoracic-Abdominal Ganglion
11.1
Adult Crop
15.2
Adult Midgut
12.1
Adult Hindgut
11.9
Adult Malpighian Tubules
5.5
Adult Fat Body
14
Adult Salivary Gland
29.8
Adult Heart
2.95
Adult VirginFemale Spermatheca
12.3
Adult InseminatedFemale Spermatheca
11
Adult Ovary
4.6
Adult Testis
1.6
Adult Male Accessory Gland
15.6
Adult Carcass
10.7
Expression Level Scale
None
Low
Moderate
High
log, scaled to High level expression
Tissue
Expression Level
Larval Central Nervous System
204.875
Larval Midgut
15.2
Larval Hindgut
11.3
Larval Malpighian Tubules
5.9
Larval Fat Body
10.5
Larval Salivary Gland
9.7
Larval Trachea
12.675
Larval Carcass
57.175
Adult Head
8.1
Adult Eye
5.925
Adult Brain
4
Adult Thoracic-Abdominal Ganglion
11.1
Adult Crop
15.2
Adult Midgut
12.1
Adult Hindgut
11.9
Adult Malpighian Tubules
5.5
Adult Fat Body
14
Adult Salivary Gland
29.8
Adult Heart
2.95
Adult VirginFemale Spermatheca
12.3
Adult InseminatedFemale Spermatheca
11
Adult Ovary
4.6
Adult Testis
1.6
Adult Male Accessory Gland
15.6
Adult Carcass
10.7
Expression Level Scale
None
Low
Moderate
High
Very high
log, scaled to Very high expression
Tissue
Expression Level
Larval Central Nervous System
204.875
Larval Midgut
15.2
Larval Hindgut
11.3
Larval Malpighian Tubules
5.9
Larval Fat Body
10.5
Larval Salivary Gland
9.7
Larval Trachea
12.675
Larval Carcass
57.175
Adult Head
8.1
Adult Eye
5.925
Adult Brain
4
Adult Thoracic-Abdominal Ganglion
11.1
Adult Crop
15.2
Adult Midgut
12.1
Adult Hindgut
11.9
Adult Malpighian Tubules
5.5
Adult Fat Body
14
Adult Salivary Gland
29.8
Adult Heart
2.95
Adult VirginFemale Spermatheca
12.3
Adult InseminatedFemale Spermatheca
11
Adult Ovary
4.6
Adult Testis
1.6
Adult Male Accessory Gland
15.6
Adult Carcass
10.7
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 no expression detected. Peak expression observed within 00-12 hour embryonic stages.
[download data (TSV)]
Please Note FlyBase no
longer curates genomic clone accessions so this list
may not be complete
cDNA Clones ( 47 )
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.
Electrophoretic mobility shift assays demonstrate that Brd is directly activated in proneural clusters of the late third-instar wing imaginal disc by protein complexes that include the ac and sc bHLH proteins.
Mutations of Brd cause either sensory organ multiplication or loss. Cell markers reveal that multiplication results from the determination of supernumerary precursor cells and loss from the inappropriate differentiation of all precursor cells as neurons.
Causes production of supernumerary chaetae and sensilla at or near normal positions. Brd alleles affect all classes of adult sensory organs. The combination of sensilla multiplication and loss phenotypes is made more severe by loss-of-function mutations at N and neur and are decreased in the presence of three wild-type copies of these genes.