The gene prickle is referred to in FlyBase by the symbol Dmel\pk (CG11084, FBgn0003090). 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: establishment or maintenance of cell polarity; establishment of imaginal disc-derived wing hair orientation; establishment of ommatidial planar polarity; morphogenesis of a polarized epithelium. 102 alleles are reported. The phenotypes of these alleles are annotated with: adult segment; organ system subdivision; organ system; thoracic segment; appendage segment; external compound sense organ; metatarsus; integumentary specialisation; peripheral nervous system; acellular anatomical structure; sense organ. It has 3 annotated transcripts and 3 annotated polypeptides. Protein features are: PET domain; Zinc finger, LIM-type. 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 06-18 hour embryonic stages, at stages throughout the pupal period. 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 1636612_a_at completely aligns to an exonic region common to each of the 3 FlyBase-annotated transcript isoforms of pk. Gene sequence location is 2R:3038208..3110883.
User Contributed Data
External Summaries
Phenotypic Description from the Red Book (Lindsley
& Zimm 1992)
Gene/Allele symbols may differ
from current usage
pk: prickle
Polarity pattern of wing, haltere, and notum altered
in mutants. Chaetae of triple row on anterior wing slanted
anteriorly instead of posteriorly. Trichomes near L2 vein
arranged in counterclockwise whorl on right wing blade, in
clockwise whorl on left blade; trichomes in anterior wing
occasionally duplicated (Gubb and Garcia-Bellido, 1982). On
the notum, the posterior acrostichals are irregularly erect
and whorled. Occasionally, extra dorsocentral and scutellar
bristles appear at temperatures above 23. Mutant flies
slightly larger than wild type. Gubb and Garcia-Bellido
(1982) describe somatic clones of homozygous pk cells.
sple: spiny legs
Polarity of chaetae and trichomes on legs irregular;
relations between bracts and bristles disrupted. High
incidence of ectopic tarsal joints with inverted polarity,
especially in tarsae 3 and 4; incomplete intersegmental membranes between tarsal segments, especially between segments 3
and 4; no extra sensilla companiformia despite extra joints.
Chaetae on abdominal tergites turned toward midline instead of
pointing posteriorly as in wild type; polarity of bristles on
sternites disrupted as well.
sple3
A low-temperature-sensitive allele. Legs of flies
raised at 19 highly condensed with incomplete joints, haphazard bristle pattern, occasional increase in number of bristle
rows, and absence of some prominent markers. Flies unable to
walk and soon get stuck in food. In sple3 flies raised at 28
53% of legs, though apparently normal, display abnormalities
such as swollen second, third, and fourth tarsal segments,
abnormal tarsal joints and reversals in bristle orientation in
the middle of every segment; such flies able to walk and
breed. About 30% of legs show phenotype intermediate between
the two phenotypes described above. Mutant phenotype
expressed in the homeotic legs of Antp and ssa; also expressed
in mitotic clones.
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In 28-34hr pupal wings, pk transcripts are expressed uniformly in intervein cells but not in presumptive vein regions. In pupal legs, transcripts are uniform in most cells but are excluded from the segmental boundaries. Low levels are detected in restricted domains in larval imaginal discs. In the eye disc, expression is detected in a stripe of cells behind the morphogenetic furrow. In wing discs, expression is higher along the dorsoventral compartment boundary. In embryos, a dynamic expression pattern is observed. Expression is highest in cells engaged in morphogenetic movements such as invaginating midline cells, the cephalic fold, and at parasegmental boundaries. Expression of the "pk" and "sple" isoforms is indistinguishable.
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
199.5
Larval Midgut
7.7
Larval Hindgut
34.3
Larval Malpighian Tubules
4.7
Larval Fat Body
7.1
Larval Salivary Gland
6.5
Larval Trachea
78.275
Larval Carcass
29.675
Adult Head
20.3
Adult Eye
47.4
Adult Brain
17.3
Adult Thoracic-Abdominal Ganglion
16.9
Adult Crop
61.6
Adult Midgut
21.3
Adult Hindgut
42.1
Adult Malpighian Tubules
6
Adult Fat Body
15.3
Adult Salivary Gland
7.8
Adult Heart
4.975
Adult VirginFemale Spermatheca
24.1
Adult InseminatedFemale Spermatheca
21.1
Adult Ovary
6
Adult Testis
9.7
Adult Male Accessory Gland
23.9
Adult Carcass
32.7
Expression Level Scale
None
Low
Moderate
Linear, scaled to Moderate expression
Tissue
Expression Level
Larval Central Nervous System
199.5
Larval Midgut
7.7
Larval Hindgut
34.3
Larval Malpighian Tubules
4.7
Larval Fat Body
7.1
Larval Salivary Gland
6.5
Larval Trachea
78.275
Larval Carcass
29.675
Adult Head
20.3
Adult Eye
47.4
Adult Brain
17.3
Adult Thoracic-Abdominal Ganglion
16.9
Adult Crop
61.6
Adult Midgut
21.3
Adult Hindgut
42.1
Adult Malpighian Tubules
6
Adult Fat Body
15.3
Adult Salivary Gland
7.8
Adult Heart
4.975
Adult VirginFemale Spermatheca
24.1
Adult InseminatedFemale Spermatheca
21.1
Adult Ovary
6
Adult Testis
9.7
Adult Male Accessory Gland
23.9
Adult Carcass
32.7
Expression Level Scale
None
Low
Moderate
High
Linear, scaled to High level expression
Tissue
Expression Level
Larval Central Nervous System
199.5
Larval Midgut
7.7
Larval Hindgut
34.3
Larval Malpighian Tubules
4.7
Larval Fat Body
7.1
Larval Salivary Gland
6.5
Larval Trachea
78.275
Larval Carcass
29.675
Adult Head
20.3
Adult Eye
47.4
Adult Brain
17.3
Adult Thoracic-Abdominal Ganglion
16.9
Adult Crop
61.6
Adult Midgut
21.3
Adult Hindgut
42.1
Adult Malpighian Tubules
6
Adult Fat Body
15.3
Adult Salivary Gland
7.8
Adult Heart
4.975
Adult VirginFemale Spermatheca
24.1
Adult InseminatedFemale Spermatheca
21.1
Adult Ovary
6
Adult Testis
9.7
Adult Male Accessory Gland
23.9
Adult Carcass
32.7
Expression Level Scale
None
Low
Moderate
High
Very high
Linear, scaled to Very high expression
Tissue
Expression Level
Larval Central Nervous System
199.5
Larval Midgut
7.7
Larval Hindgut
34.3
Larval Malpighian Tubules
4.7
Larval Fat Body
7.1
Larval Salivary Gland
6.5
Larval Trachea
78.275
Larval Carcass
29.675
Adult Head
20.3
Adult Eye
47.4
Adult Brain
17.3
Adult Thoracic-Abdominal Ganglion
16.9
Adult Crop
61.6
Adult Midgut
21.3
Adult Hindgut
42.1
Adult Malpighian Tubules
6
Adult Fat Body
15.3
Adult Salivary Gland
7.8
Adult Heart
4.975
Adult VirginFemale Spermatheca
24.1
Adult InseminatedFemale Spermatheca
21.1
Adult Ovary
6
Adult Testis
9.7
Adult Male Accessory Gland
23.9
Adult Carcass
32.7
Expression Level Scale
Very high
log, scaled to maximum expression level
Tissue
Expression Level
Larval Central Nervous System
199.5
Larval Midgut
7.7
Larval Hindgut
34.3
Larval Malpighian Tubules
4.7
Larval Fat Body
7.1
Larval Salivary Gland
6.5
Larval Trachea
78.275
Larval Carcass
29.675
Adult Head
20.3
Adult Eye
47.4
Adult Brain
17.3
Adult Thoracic-Abdominal Ganglion
16.9
Adult Crop
61.6
Adult Midgut
21.3
Adult Hindgut
42.1
Adult Malpighian Tubules
6
Adult Fat Body
15.3
Adult Salivary Gland
7.8
Adult Heart
4.975
Adult VirginFemale Spermatheca
24.1
Adult InseminatedFemale Spermatheca
21.1
Adult Ovary
6
Adult Testis
9.7
Adult Male Accessory Gland
23.9
Adult Carcass
32.7
Expression Level Scale
None
Low
Moderate
log, scaled to Moderate expression
Tissue
Expression Level
Larval Central Nervous System
199.5
Larval Midgut
7.7
Larval Hindgut
34.3
Larval Malpighian Tubules
4.7
Larval Fat Body
7.1
Larval Salivary Gland
6.5
Larval Trachea
78.275
Larval Carcass
29.675
Adult Head
20.3
Adult Eye
47.4
Adult Brain
17.3
Adult Thoracic-Abdominal Ganglion
16.9
Adult Crop
61.6
Adult Midgut
21.3
Adult Hindgut
42.1
Adult Malpighian Tubules
6
Adult Fat Body
15.3
Adult Salivary Gland
7.8
Adult Heart
4.975
Adult VirginFemale Spermatheca
24.1
Adult InseminatedFemale Spermatheca
21.1
Adult Ovary
6
Adult Testis
9.7
Adult Male Accessory Gland
23.9
Adult Carcass
32.7
Expression Level Scale
None
Low
Moderate
High
log, scaled to High level expression
Tissue
Expression Level
Larval Central Nervous System
199.5
Larval Midgut
7.7
Larval Hindgut
34.3
Larval Malpighian Tubules
4.7
Larval Fat Body
7.1
Larval Salivary Gland
6.5
Larval Trachea
78.275
Larval Carcass
29.675
Adult Head
20.3
Adult Eye
47.4
Adult Brain
17.3
Adult Thoracic-Abdominal Ganglion
16.9
Adult Crop
61.6
Adult Midgut
21.3
Adult Hindgut
42.1
Adult Malpighian Tubules
6
Adult Fat Body
15.3
Adult Salivary Gland
7.8
Adult Heart
4.975
Adult VirginFemale Spermatheca
24.1
Adult InseminatedFemale Spermatheca
21.1
Adult Ovary
6
Adult Testis
9.7
Adult Male Accessory Gland
23.9
Adult Carcass
32.7
Expression Level Scale
None
Low
Moderate
High
Very high
log, scaled to Very high expression
Tissue
Expression Level
Larval Central Nervous System
199.5
Larval Midgut
7.7
Larval Hindgut
34.3
Larval Malpighian Tubules
4.7
Larval Fat Body
7.1
Larval Salivary Gland
6.5
Larval Trachea
78.275
Larval Carcass
29.675
Adult Head
20.3
Adult Eye
47.4
Adult Brain
17.3
Adult Thoracic-Abdominal Ganglion
16.9
Adult Crop
61.6
Adult Midgut
21.3
Adult Hindgut
42.1
Adult Malpighian Tubules
6
Adult Fat Body
15.3
Adult Salivary Gland
7.8
Adult Heart
4.975
Adult VirginFemale Spermatheca
24.1
Adult InseminatedFemale Spermatheca
21.1
Adult Ovary
6
Adult Testis
9.7
Adult Male Accessory Gland
23.9
Adult Carcass
32.7
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 moderately high expression to a trough of very low expression. Peak expression observed within 06-18 hour embryonic 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 ( 124 )
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.
in and fy are needed for cells to respond to pk and stan. Genetic analysis is not consistent with fz-like class of genes fz, pk, Vang, stan and dsh acting simply as positive or negative regulators of in and fy.
The "Pk" class of alleles carry molecular lesions within the proximal 30kb of the transcription unit, whereas the "Pk-Sple" class of alleles map to the distal section of the transcription unit. In direction of increasing cytology: Spn43Aa+ pk+ Spn43Ab- nec- pk+ Ady43A-
Alleles can be divided into three phenotypic classes, "Pk", "Pk-Sple", and "Sple". No allele causes an embryonic phenotype, even when homozygous mutant embryos develop from homozygous mutant mothers. Deletions of the pk gene are fully viable and fertile. The defects of the double mutant "Pk-Sple" class are the same as those seen with deletions of the entire gene. Paradoxically the "Pk" and "Sple" classes give more severe phenotypes with "Pk" affecting the wing and notum and "Sple" in the legs abdomen and eyes.
pk is a slightly haploinsufficient gene. A deficiency for pk (and some pk point mutants) shows a weak, partially penetrant dominant tissue polarity phenotype. This effect is enhanced by several Vang alleles. Phenotypic data suggest that genetics of Vang and its interactions with pk are complex. Several, but not all, Vang alleles act as enhancers of the pk haploinsufficient tissue polarity phenotype, and the pkTBJ21 antimorphic phenotype. Mutations in pk can also act as suppressors of Vang dominant phenotypes.
In pk mutants the dorsal/ventral boundary in the eye is respected but the mechanism for ommatidial polarization is perturbed. A likely explanation for the observed phenotype is that the fates of dorsal and ventral cells within a cluster have been interchanged.
Mosaic analysis demonstrates pk function in either R3, R4 or R5 photoreceptor cell appears to be sufficient to drive an ommatidium in the right direction.
Polarity pattern of wing, haltere and notum altered. Triple row bristles on anterior wing slanted proximally instead of distally. On the notum, the posterior acrostichal bristles are whorled.
Trichomes near L2 vein arranged in counterclockwise whorl on right wing blade, in clockwise whorl on left blade; trichomes in anterior wing occasionally duplicated. Somatic clones of homozygous pk mutant cells have been generated. Not a vital locus.
Insect wing membrane topography is determined by the dorsal wing epithelium. [FBrf0220472]
Warrington et al., 2013, Development 140(5): 1045--1054
The Frizzled-dependent planar polarity pathway locally promotes E-cadherin turnover via recruitment of RhoGEF2. [FBrf0220829]
Butchar et al., 2012, Genetics 191(4): 1213--1226
New negative feedback regulators of egfr signaling in Drosophila. [FBrf0219175]
Daulat et al., 2012, Mol. Cell. Biol. 32(1): 173--185
Mink1 Regulates β-Catenin-Independent Wnt Signaling via Prickle Phosphorylation. [FBrf0216890]
Kuroda et al., 2012, Mech. Dev. 128(11-12): 625--639
Canonical Wnt signaling in the visceral muscle is required for left-right asymmetric development of the Drosophila midgut. [FBrf0217619]
Peng et al., 2012, Dev. Cell 23(3): 507--518
Planar Polarized Protrusions Break the Symmetry of EGFR Signaling during Drosophila Bract Cell Fate Induction. [FBrf0219458]
Sagner et al., 2012, Curr. Biol. 22(14): 1296--1301
Establishment of Global Patterns of Planar Polarity during Growth of the Drosophila Wing Epithelium. [FBrf0219045]
Struhl et al., 2012, Development 139(19): 3665--3674
Dissecting the molecular bridges that mediate the function of Frizzled in planar cell polarity. [FBrf0220280]
Weber et al., 2012, Genetics 191(1): 145--162
Novel regulators of planar cell polarity: a genetic analysis in Drosophila. [FBrf0218210]
Weber et al., 2012, PLoS ONE 7(4): e34745
Genome-Wide Association Analysis of Oxidative Stress Resistance in Drosophila melanogaster. [FBrf0218073]
Hogan et al., 2011, PLoS Genet. 7(2): e1001305
Two frizzled planar cell polarity signals in the Drosophila wing are differentially organized by the fat/dachsous pathway. [FBrf0213159]
Luo et al., 2011, Development 138(13): 2761--2771
Direct targets of the D. melanogaster DSXF protein and the evolution of sexual development. [FBrf0213878]
Matsubara et al., 2011, Genes Dev. 25(18): 1982--1996
The seven-pass transmembrane cadherin Flamingo controls dendritic self-avoidance via its binding to a LIM domain protein, Espinas, in Drosophila sensory neurons. [FBrf0215818]
Michaut et al., 2011, Dev. Growth Differ. 53(9): 982--993
Analyzing the function of a hox gene: An evolutionary approach. [FBrf0216990]
Mirkovic et al., 2011, Nat. Struct. Mol. Biol. 18(6): 665--672
Nemo kinase phosphorylates β-catenin to promote ommatidial rotation and connects core PCP factors to E-cadherin-β-catenin. [FBrf0213849]
Mrkusich et al., 2011, Dev. Biol. 358(1): 224--230
The core planar cell polarity gene prickle interacts with flamingo to promote sensory axon advance in the Drosophila embryo. [FBrf0215204]
Shimizu et al., 2011, J. Neurosci. 31(13): 4944--4954
The wnt5/planar cell polarity pathway regulates axonal development of the Drosophila mushroom body neuron. [FBrf0213382]
Strutt et al., 2011, Dev. Cell 20(4): 511--525
Dynamics of core planar polarity protein turnover and stable assembly into discrete membrane subdomains. [FBrf0214246]
Tao et al., 2011, Am. J. Hum. Genet. 88(2): 138--149
Mutations in prickle orthologs cause seizures in flies, mice, and humans. [FBrf0212997]