The gene odd paired is referred to in FlyBase by the symbol Dmel\opa (CG1133, FBgn0003002). It is a protein_coding_gene from Drosophila melanogaster. Based on sequence similarity, it is predicted to have molecular function: sequence-specific DNA binding transcription factor activity. There is experimental evidence that it is involved in the biological process: decapentaplegic signaling pathway; eye-antennal disc morphogenesis; germ cell migration; midgut development. 43 alleles are reported. The phenotypes of these alleles are annotated with: multicellular structure; anatomical structure; organ system; acellular anatomical structure; late extended germ band embryo; imaginal precursor; extended germ band embryo; embryonic gnathal segment; non-connected developing system; larval head segment; heart primordium; external compound sense organ. It has one annotated transcript and one annotated polypeptide. Protein features are: Zinc finger C2H2-type/integrase DNA-binding domain; Zinc finger, C2H2; Zinc finger, C2H2-like. Summary of modENCODE Temporal Expression Profile: Temporal profile ranges from a peak of high expression to a trough of extremely low expression. Peak expression observed within 00-06 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 1628865_at completely aligns to an exonic region of the only FlyBase-annotated transcript isoform of opa. Gene sequence location is 3R:678535..695701.
User Contributed Data
External Summaries
Phenotypic Description from the Red Book (Lindsley
& Zimm 1992)
Gene/Allele symbols may differ
from current usage
opa: odd paired
Deletes alternate metasegments, as defined by a line
separating the anterior from the posterior parts of the anterior compartments; portions of denticle bands of T2, A1, A3,
A5, and A7 and naked cuticle of T3, A2, A4 and A6 missing.
Pattern of Ubx protein distribution in the double-sized units
reveals them to be composite, the anterior half being derived
from an odd-numbered parasegment and the posterior half from
an even-numbered parasegment (read metasegment) (Ingham and
Martinez-Arias, Nature 324: 592-97). Without discernable
effect on ftz expression (Carrol and Scott, 1980, Cell
45: 113-26). However, exhibits loss of en product with a
consequent increase in Ubx expression in even-numbered
parasegments (Martinez-Arias and White, 1988, Development
102: 325-38).
Recent Updates
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FB2013_03
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opa transcripts are detected in embryonic, larval, and pupal stages with peak levels between 2 and 12 hours of embryogenesis. opa transcripts are first detected in early stage 5 embryos in a 10 cell wide stripe at about 80% egg length. Expression extends posteriorly and becomes uniform over the region from 20% to 80% egg length with the posterior border being more sharply defined than the anterior border. Expression continues in this domain through gastrulation. During germ band extension, a pattern of 14 stripes develops over a low background level of expression.
opa is expressed in a broad domain encompassing the entire segmented region of the embryo during stages 5-9. At stage 5, expression extends from 16%-78% egg length in ventrally located cells fated to become mesoderm and in dorsally located ectodermal cells. During gastrulation, expression becomes periodic, showing 14 stripes. By late stage 9, expression is no longer seen in the ectoderm or the mesoderm with the exception of a small number of cells in the neurogenic region, the tip of the germ band, and the head. Late in stage 11, opa expression initiates in the visceral mesoderm in seven discrete clusters of cells, arranged in two groups. In stage 12, expression becomes continuous in each region yielding at stage 13, two distinct domains of expression in the visceral mesoderm. The anterior domain corresponds to parasegment 5 and the posterior domain to parasegments 9-12. During stage 15, the 2nd midgut constriction forms between the opa expression domains. At stage 16, the first midgut constriction forms at the posterior boundary of the anterior opa expression domain and the third midgut constriction forms within the anterior margin of the posterior opa expression domain.
opa protein ispresent in a block from 20% to 80% egg length during cellularization andinto gastrulation. During germ band extension, a pattern of 14 stripesdevelops over a low background level of expression.
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
313.2
Larval Midgut
18.8
Larval Hindgut
5.4
Larval Malpighian Tubules
5
Larval Fat Body
1.9
Larval Salivary Gland
4.8
Larval Trachea
15.075
Larval Carcass
26.175
Adult Head
31.2
Adult Eye
6.425
Adult Brain
78.7
Adult Thoracic-Abdominal Ganglion
52.5
Adult Crop
5.5
Adult Midgut
13.7
Adult Hindgut
4.3
Adult Malpighian Tubules
4.1
Adult Fat Body
11.7
Adult Salivary Gland
11.7
Adult Heart
3.05
Adult VirginFemale Spermatheca
5.2
Adult InseminatedFemale Spermatheca
3.6
Adult Ovary
1.9
Adult Testis
0.6
Adult Male Accessory Gland
4.8
Adult Carcass
17
Expression Level Scale
None
Low
Moderate
Linear, scaled to Moderate expression
Tissue
Expression Level
Larval Central Nervous System
313.2
Larval Midgut
18.8
Larval Hindgut
5.4
Larval Malpighian Tubules
5
Larval Fat Body
1.9
Larval Salivary Gland
4.8
Larval Trachea
15.075
Larval Carcass
26.175
Adult Head
31.2
Adult Eye
6.425
Adult Brain
78.7
Adult Thoracic-Abdominal Ganglion
52.5
Adult Crop
5.5
Adult Midgut
13.7
Adult Hindgut
4.3
Adult Malpighian Tubules
4.1
Adult Fat Body
11.7
Adult Salivary Gland
11.7
Adult Heart
3.05
Adult VirginFemale Spermatheca
5.2
Adult InseminatedFemale Spermatheca
3.6
Adult Ovary
1.9
Adult Testis
0.6
Adult Male Accessory Gland
4.8
Adult Carcass
17
Expression Level Scale
None
Low
Moderate
High
Linear, scaled to High level expression
Tissue
Expression Level
Larval Central Nervous System
313.2
Larval Midgut
18.8
Larval Hindgut
5.4
Larval Malpighian Tubules
5
Larval Fat Body
1.9
Larval Salivary Gland
4.8
Larval Trachea
15.075
Larval Carcass
26.175
Adult Head
31.2
Adult Eye
6.425
Adult Brain
78.7
Adult Thoracic-Abdominal Ganglion
52.5
Adult Crop
5.5
Adult Midgut
13.7
Adult Hindgut
4.3
Adult Malpighian Tubules
4.1
Adult Fat Body
11.7
Adult Salivary Gland
11.7
Adult Heart
3.05
Adult VirginFemale Spermatheca
5.2
Adult InseminatedFemale Spermatheca
3.6
Adult Ovary
1.9
Adult Testis
0.6
Adult Male Accessory Gland
4.8
Adult Carcass
17
Expression Level Scale
None
Low
Moderate
High
Very high
Linear, scaled to Very high expression
Tissue
Expression Level
Larval Central Nervous System
313.2
Larval Midgut
18.8
Larval Hindgut
5.4
Larval Malpighian Tubules
5
Larval Fat Body
1.9
Larval Salivary Gland
4.8
Larval Trachea
15.075
Larval Carcass
26.175
Adult Head
31.2
Adult Eye
6.425
Adult Brain
78.7
Adult Thoracic-Abdominal Ganglion
52.5
Adult Crop
5.5
Adult Midgut
13.7
Adult Hindgut
4.3
Adult Malpighian Tubules
4.1
Adult Fat Body
11.7
Adult Salivary Gland
11.7
Adult Heart
3.05
Adult VirginFemale Spermatheca
5.2
Adult InseminatedFemale Spermatheca
3.6
Adult Ovary
1.9
Adult Testis
0.6
Adult Male Accessory Gland
4.8
Adult Carcass
17
Expression Level Scale
Very high
log, scaled to maximum expression level
Tissue
Expression Level
Larval Central Nervous System
313.2
Larval Midgut
18.8
Larval Hindgut
5.4
Larval Malpighian Tubules
5
Larval Fat Body
1.9
Larval Salivary Gland
4.8
Larval Trachea
15.075
Larval Carcass
26.175
Adult Head
31.2
Adult Eye
6.425
Adult Brain
78.7
Adult Thoracic-Abdominal Ganglion
52.5
Adult Crop
5.5
Adult Midgut
13.7
Adult Hindgut
4.3
Adult Malpighian Tubules
4.1
Adult Fat Body
11.7
Adult Salivary Gland
11.7
Adult Heart
3.05
Adult VirginFemale Spermatheca
5.2
Adult InseminatedFemale Spermatheca
3.6
Adult Ovary
1.9
Adult Testis
0.6
Adult Male Accessory Gland
4.8
Adult Carcass
17
Expression Level Scale
None
Low
Moderate
High
log, scaled to Moderate expression
Tissue
Expression Level
Larval Central Nervous System
313.2
Larval Midgut
18.8
Larval Hindgut
5.4
Larval Malpighian Tubules
5
Larval Fat Body
1.9
Larval Salivary Gland
4.8
Larval Trachea
15.075
Larval Carcass
26.175
Adult Head
31.2
Adult Eye
6.425
Adult Brain
78.7
Adult Thoracic-Abdominal Ganglion
52.5
Adult Crop
5.5
Adult Midgut
13.7
Adult Hindgut
4.3
Adult Malpighian Tubules
4.1
Adult Fat Body
11.7
Adult Salivary Gland
11.7
Adult Heart
3.05
Adult VirginFemale Spermatheca
5.2
Adult InseminatedFemale Spermatheca
3.6
Adult Ovary
1.9
Adult Testis
0.6
Adult Male Accessory Gland
4.8
Adult Carcass
17
Expression Level Scale
None
Low
Moderate
High
log, scaled to High level expression
Tissue
Expression Level
Larval Central Nervous System
313.2
Larval Midgut
18.8
Larval Hindgut
5.4
Larval Malpighian Tubules
5
Larval Fat Body
1.9
Larval Salivary Gland
4.8
Larval Trachea
15.075
Larval Carcass
26.175
Adult Head
31.2
Adult Eye
6.425
Adult Brain
78.7
Adult Thoracic-Abdominal Ganglion
52.5
Adult Crop
5.5
Adult Midgut
13.7
Adult Hindgut
4.3
Adult Malpighian Tubules
4.1
Adult Fat Body
11.7
Adult Salivary Gland
11.7
Adult Heart
3.05
Adult VirginFemale Spermatheca
5.2
Adult InseminatedFemale Spermatheca
3.6
Adult Ovary
1.9
Adult Testis
0.6
Adult Male Accessory Gland
4.8
Adult Carcass
17
Expression Level Scale
None
Low
Moderate
High
Very high
log, scaled to Very high expression
Tissue
Expression Level
Larval Central Nervous System
313.2
Larval Midgut
18.8
Larval Hindgut
5.4
Larval Malpighian Tubules
5
Larval Fat Body
1.9
Larval Salivary Gland
4.8
Larval Trachea
15.075
Larval Carcass
26.175
Adult Head
31.2
Adult Eye
6.425
Adult Brain
78.7
Adult Thoracic-Abdominal Ganglion
52.5
Adult Crop
5.5
Adult Midgut
13.7
Adult Hindgut
4.3
Adult Malpighian Tubules
4.1
Adult Fat Body
11.7
Adult Salivary Gland
11.7
Adult Heart
3.05
Adult VirginFemale Spermatheca
5.2
Adult InseminatedFemale Spermatheca
3.6
Adult Ovary
1.9
Adult Testis
0.6
Adult Male Accessory Gland
4.8
Adult Carcass
17
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 extremely 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 ( 29 )
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.
One of 42 Drosophila genes identified as being most likely to reveal molecular and cellular mechanisms of nervous system development or plasticity relevant to human Mental Retardation disorders.
opa is required for formation of the three characteristic midgut constrictions. At the locations of the first and third constrictions, opa is positively regulated by Antp and abd-A, respectively, and negatively regulated by Ubx and dpp.
opa activity is essential for the appropriate level and timing of en and wg expression in all parasegments, but does not determine their restricted spatial domains of expression.
Deletes alternate metasegments, as defined by a line separating the anterior from the posterior parts of the anterior compartments; portions of denticle bands of T2, A1, A3, A5 and A7 and naked cuticle of T3, A2, A4 and A6 missing.
The transition of prd RNA expression from the early 'pair-rule' pattern to the 'segment-polarity' pattern is regulated by the secondary pair-rule genes opa and odd.
Schaub and Frasch, 2013, Dev. Biol. 376(2): 245--259
Org-1 is required for the diversification of circular visceral muscle founder cells and normal midgut morphogenesis. [FBrf0221030]
Shu and Li, 2013, Theor. Biol. Med. Model. 10(1): 11
A statistical thin-tail test of predicting regulatory regions in the Drosophila genome. [FBrf0221021]
Gaertner et al., 2012, Cell Rep. 2(6): 1670--1683
Poised RNA Polymerase II Changes over Developmental Time and Prepares Genes for Future Expression. [FBrf0220312]
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]
Shu and Li, 2012, Comput. Biol. Med. 42(9): 935--941
A statistical fat-tail test of predicting regulatory regions in the Drosophila genome. [FBrf0219304]
Abruzzi et al., 2011, Genes Dev. 25(22): 2374--2386
Harrison et al., 2011, PLoS Genet. 7(10): e1002266
Zelda Binding in the Early Drosophila melanogaster Embryo Marks Regions Subsequently Activated at the Maternal-to-Zygotic Transition. [FBrf0216528]
Kaplan et al., 2011, PLoS Genet. 7(2): e1001290
Quantitative Models of the Mechanisms That Control Genome-Wide Patterns of Transcription Factor Binding during Early Drosophila Development. [FBrf0213025]
Walrad et al., 2011, Mol. Biol. Cell 22(8): 1364--1374
Hairless is a cofactor for Runt-dependent transcriptional regulation. [FBrf0213441]
Zheng et al., 2011, PLoS ONE 6(8): e22956
Drosophila Ten-m and Filamin Affect Motor Neuron Growth Cone Guidance. [FBrf0214744]