The gene pleiohomeotic is referred to in FlyBase by the symbol Dmel\pho (CG17743, FBgn0002521). It is a protein_coding_gene from Drosophila melanogaster. There is experimental evidence that it has the molecular function: chromatin DNA binding; RNA polymerase II distal enhancer sequence-specific DNA binding; sequence-specific DNA binding; chromatin binding; DNA binding. There is experimental evidence that it is involved in the biological process: gene silencing; regulation of transcription, DNA-dependent; negative regulation of gene expression; DNA topological change; chromatin silencing; negative regulation of transcription, DNA-dependent. 23 alleles are reported. The phenotypes of these alleles are annotated with: unguis; antenna; sex comb; pupal abdomen. It has 2 annotated transcripts and 2 annotated polypeptides. 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 moderately high expression to a trough of low expression. Peak expression observed at stages throughout embryogenesis, during late larval stages, during early pupal stages, in adult female stages. Summary of FlyAtlas Anatomical Expression Data: High or moderate levels of expression observed in all larval and adult organs/tissues. Expression at high levels in the following post-embryonic organs or tissues: larval/adult central nervous system, adult ovary, larval carcass. Expression at moderate levels in the following post-embryonic organs or tissues: adult head, adult eye, adult crop, larval/adult midgut, larval/adult hindgut, larval/adult Malpighian tubules, adult heart, larval/adult fat body, larval/adult salivary gland, larval trachea, adult spermathecae, adult male reproductive system, adult carcass. Comments on Affy2 ProbeSet: ProbeSet 1626947_s_at completely aligns to an exonic region common to each of the 2 FlyBase-annotated transcript isoforms of pho. Gene sequence location is 4:1193095..1202254.
User Contributed Data
External Summaries
Phenotypic Description from the Red Book (Lindsley
& Zimm 1992)
Gene/Allele symbols may differ
from current usage
l(4)102EFc (R. Denell)
Homozygotes from heterozygous mothers die as pupae
(Hochman). Those that reach the pharate-adult stage show partial homeotic transformations of first and second antennal
segments into proximal leg structures, meso- and metathoracic
legs into prothoracic legs, as well as posteriorly directed
transformations of features of the abdominal hypoderm and of
parovaria into spermathecae in females. All three pairs of
legs distorted, with tarsal segments swollen and sometimes
fused with missing claws; some abnormalities of derivatives of
the antennal disc and of the dorsal prothorax also present
(Gehring; Duncan). Heterozygous adults normal, except that
males also heterozygous for a deficiency or mutation of E(Pc)
occasionally develop sex-comb teeth on meso- and metathoracic
legs (Sato et al.). Heterozygous and homozygous larvae from
heterozygous mothers normal; homozygotes from transplanted
homozygous ovaries die as late embryos with a complex homeotic
syndrome. Head involution incomplete, and portions of head
develop abdominal-like denticles. All thoracic segments partially transformed to resemble the first abdominal segment,
and more posterior segments may develop cuticular features
characteristic of the eighth abdominal segment. Heterozygtoes
from homozygous ovaries sometimes die as late embryos displaying relatively mild homeotic effects of the head and
mesothorax or slightly incomplete head involution or both, but
often hatch and die during larval or pupal stages. Rarely,
adults eclose, often with appendages that are crippled or are
missing owing to failure of imaginal-disc evagination
(Denell). Most embryos produced by oocytes hemizygous for
l(4)102EFc3 and l(4)102EFc4, achieved by pole-cell transplantation, fail to form cuticle, even with a wild-type paternal
complement; a few of the latter genotype produce enough cuticle to reveal extensive defects in segmentation; setal belts
usually missing or transformed; head involution fails; anterior hole present in most embryos (Breen and Duncan, 1986,
Dev. Biol. 118: 442-45).
Recent Updates
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Summary of FlyAtlas Anatomical Expression Data: High or moderate levels of expression observed in all larval and adult organs/tissues. Expression at high levels in the following post-embryonic organs or tissues: larval/adult central nervous system, adult ovary, larval carcass. Expression at moderate levels in the following post-embryonic organs or tissues: adult head, adult eye, adult crop, larval/adult midgut, larval/adult hindgut, larval/adult Malpighian tubules, adult heart, larval/adult fat body, larval/adult salivary gland, larval trachea, adult spermathecae, adult male reproductive system, adult carcass.
[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
966.55
Larval Midgut
360.8
Larval Hindgut
367.6
Larval Malpighian Tubules
449.1
Larval Fat Body
378.3
Larval Salivary Gland
377.4
Larval Trachea
354.575
Larval Carcass
525.775
Adult Head
359.2
Adult Eye
332.425
Adult Brain
716.4
Adult Thoracic-Abdominal Ganglion
722
Adult Crop
360.6
Adult Midgut
235.8
Adult Hindgut
216.1
Adult Malpighian Tubules
293.6
Adult Fat Body
232.1
Adult Salivary Gland
342.7
Adult Heart
166.4
Adult VirginFemale Spermatheca
281.9
Adult InseminatedFemale Spermatheca
350.5
Adult Ovary
892.7
Adult Testis
299.9
Adult Male Accessory Gland
314.7
Adult Carcass
245.5
Expression Level Scale
None
Low
Moderate
High
Very high
Linear, scaled to Moderate expression
Tissue
Expression Level
Larval Central Nervous System
(966.55)
Larval Midgut
360.8
Larval Hindgut
367.6
Larval Malpighian Tubules
449.1
Larval Fat Body
378.3
Larval Salivary Gland
377.4
Larval Trachea
354.575
Larval Carcass
525.775
Adult Head
359.2
Adult Eye
332.425
Adult Brain
(716.4)
Adult Thoracic-Abdominal Ganglion
(722)
Adult Crop
360.6
Adult Midgut
235.8
Adult Hindgut
216.1
Adult Malpighian Tubules
293.6
Adult Fat Body
232.1
Adult Salivary Gland
342.7
Adult Heart
166.4
Adult VirginFemale Spermatheca
281.9
Adult InseminatedFemale Spermatheca
350.5
Adult Ovary
(892.7)
Adult Testis
299.9
Adult Male Accessory Gland
314.7
Adult Carcass
245.5
Expression Level Scale
None
Low
Moderate
High
Linear, scaled to High level expression
Tissue
Expression Level
Larval Central Nervous System
966.55
Larval Midgut
360.8
Larval Hindgut
367.6
Larval Malpighian Tubules
449.1
Larval Fat Body
378.3
Larval Salivary Gland
377.4
Larval Trachea
354.575
Larval Carcass
525.775
Adult Head
359.2
Adult Eye
332.425
Adult Brain
716.4
Adult Thoracic-Abdominal Ganglion
722
Adult Crop
360.6
Adult Midgut
235.8
Adult Hindgut
216.1
Adult Malpighian Tubules
293.6
Adult Fat Body
232.1
Adult Salivary Gland
342.7
Adult Heart
166.4
Adult VirginFemale Spermatheca
281.9
Adult InseminatedFemale Spermatheca
350.5
Adult Ovary
892.7
Adult Testis
299.9
Adult Male Accessory Gland
314.7
Adult Carcass
245.5
Expression Level Scale
None
Low
Moderate
High
Very high
Linear, scaled to Very high expression
Tissue
Expression Level
Larval Central Nervous System
966.55
Larval Midgut
360.8
Larval Hindgut
367.6
Larval Malpighian Tubules
449.1
Larval Fat Body
378.3
Larval Salivary Gland
377.4
Larval Trachea
354.575
Larval Carcass
525.775
Adult Head
359.2
Adult Eye
332.425
Adult Brain
716.4
Adult Thoracic-Abdominal Ganglion
722
Adult Crop
360.6
Adult Midgut
235.8
Adult Hindgut
216.1
Adult Malpighian Tubules
293.6
Adult Fat Body
232.1
Adult Salivary Gland
342.7
Adult Heart
166.4
Adult VirginFemale Spermatheca
281.9
Adult InseminatedFemale Spermatheca
350.5
Adult Ovary
892.7
Adult Testis
299.9
Adult Male Accessory Gland
314.7
Adult Carcass
245.5
Expression Level Scale
Very high
log, scaled to maximum expression level
Tissue
Expression Level
Larval Central Nervous System
966.55
Larval Midgut
360.8
Larval Hindgut
367.6
Larval Malpighian Tubules
449.1
Larval Fat Body
378.3
Larval Salivary Gland
377.4
Larval Trachea
354.575
Larval Carcass
525.775
Adult Head
359.2
Adult Eye
332.425
Adult Brain
716.4
Adult Thoracic-Abdominal Ganglion
722
Adult Crop
360.6
Adult Midgut
235.8
Adult Hindgut
216.1
Adult Malpighian Tubules
293.6
Adult Fat Body
232.1
Adult Salivary Gland
342.7
Adult Heart
166.4
Adult VirginFemale Spermatheca
281.9
Adult InseminatedFemale Spermatheca
350.5
Adult Ovary
892.7
Adult Testis
299.9
Adult Male Accessory Gland
314.7
Adult Carcass
245.5
Expression Level Scale
None
Low
Moderate
High
Very high
log, scaled to Moderate expression
Tissue
Expression Level
Larval Central Nervous System
(966.55)
Larval Midgut
360.8
Larval Hindgut
367.6
Larval Malpighian Tubules
449.1
Larval Fat Body
378.3
Larval Salivary Gland
377.4
Larval Trachea
354.575
Larval Carcass
525.775
Adult Head
359.2
Adult Eye
332.425
Adult Brain
716.4
Adult Thoracic-Abdominal Ganglion
722
Adult Crop
360.6
Adult Midgut
235.8
Adult Hindgut
216.1
Adult Malpighian Tubules
293.6
Adult Fat Body
232.1
Adult Salivary Gland
342.7
Adult Heart
166.4
Adult VirginFemale Spermatheca
281.9
Adult InseminatedFemale Spermatheca
350.5
Adult Ovary
(892.7)
Adult Testis
299.9
Adult Male Accessory Gland
314.7
Adult Carcass
245.5
Expression Level Scale
None
Low
Moderate
High
log, scaled to High level expression
Tissue
Expression Level
Larval Central Nervous System
966.55
Larval Midgut
360.8
Larval Hindgut
367.6
Larval Malpighian Tubules
449.1
Larval Fat Body
378.3
Larval Salivary Gland
377.4
Larval Trachea
354.575
Larval Carcass
525.775
Adult Head
359.2
Adult Eye
332.425
Adult Brain
716.4
Adult Thoracic-Abdominal Ganglion
722
Adult Crop
360.6
Adult Midgut
235.8
Adult Hindgut
216.1
Adult Malpighian Tubules
293.6
Adult Fat Body
232.1
Adult Salivary Gland
342.7
Adult Heart
166.4
Adult VirginFemale Spermatheca
281.9
Adult InseminatedFemale Spermatheca
350.5
Adult Ovary
892.7
Adult Testis
299.9
Adult Male Accessory Gland
314.7
Adult Carcass
245.5
Expression Level Scale
None
Low
Moderate
High
Very high
log, scaled to Very high expression
Tissue
Expression Level
Larval Central Nervous System
966.55
Larval Midgut
360.8
Larval Hindgut
367.6
Larval Malpighian Tubules
449.1
Larval Fat Body
378.3
Larval Salivary Gland
377.4
Larval Trachea
354.575
Larval Carcass
525.775
Adult Head
359.2
Adult Eye
332.425
Adult Brain
716.4
Adult Thoracic-Abdominal Ganglion
722
Adult Crop
360.6
Adult Midgut
235.8
Adult Hindgut
216.1
Adult Malpighian Tubules
293.6
Adult Fat Body
232.1
Adult Salivary Gland
342.7
Adult Heart
166.4
Adult VirginFemale Spermatheca
281.9
Adult InseminatedFemale Spermatheca
350.5
Adult Ovary
892.7
Adult Testis
299.9
Adult Male Accessory Gland
314.7
Adult Carcass
245.5
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 low expression. Peak expression observed at stages throughout embryogenesis, during late larval stages, during early pupal stages, in adult female stages.
[download data (TSV)]
Please Note FlyBase no
longer curates genomic clone accessions so this list
may not be complete
cDNA Clones ( 160 )
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.
DNA-protein interactions: genome-wide binding profile assayed for pho protein in Kc167 cells; see Chromatin_types_NKI collection report. Individual protein-binding experiments listed under "Samples" at GEO_GSE22069 (http://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE22069).
The 'PhoRC' (pho-Sfmbt) complex binds PREs via the pho protein and methylated histones in the chromatin flanking the PREs via the Sfmbt protein to maintain a repressed chromatin state.
pho encodes a sequence-specific DNA binding protein that interacts with PRE in the en gene. The pho protein is proposed to act to anchor PcG protein complexes to DNA.
In an effort to subdivide the Pc-group genes functionally, the phenotypes of adult flies heterozygous for every pairwise combination of Pc-group mutation were examined. Most duplications of Pc-group genes neither exhibit anterior transformations nor suppress the extra sex comb phenotype of Pc-group mutations, suggesting that not all Pc-group genes behave as predicted by the mass action model.
Embryos mutant for two or more Pc group genes (Pc, Scm, Pcl, Psc, Asx, E(Pc), E(z), ph-d, pho and esc) show strong ectopic en expression, but only weak derepression occurs if embryo is mutant at only one of the Pc group genes. This effect is independent of the function of en itself, and wg.
Mutations of genes in the polycomb group (esc, E(z), Pc, ph-p, ph-d, Scm, Pcl, Sce, Asx, Psc, pho and Antp) cause abnormal segmental development due to the ectopic expression of abd-A and Abd-B. Embryos lacking both maternal and zygotic pho product were generated to determine abd-A and Abd-B expression patterns.
Homozygotes from heterozygous mothers die as pupae (Hochman). Those that reach the pharate-adult stage show partial homeotic transformations of first and second antennal segments into proximal leg structures, meso- and metathoracic legs into prothoracic legs, as well as posteriorly directed transformations of features of the abdominal hypoderm and of parovaria into spermathecae in females. All three pairs of legs distorted, with tarsal segments swollen and sometimes fused with missing claws; some abnormalities of derivatives of the antennal disc and of the dorsal prothorax also present (Gehring, 1970; Duncan, 1982). Heterozygous adults normal, except that males also heterozygous for a deficiency or mutation of E(Pc) occasionally develop sex-comb teeth on meso- and metathoracic legs (Sato et al., 1983). Heterozygous and homozygous larvae from heterozygous mothers normal; homozygotes from transplanted homozygous ovaries die as late embryos with a complex homeotic syndrome. Head involution incomplete and portions of head develop abdominal-like denticles. All thoracic segments partially transformed to resemble the first abdominal segment, and more posterior segments may develop cuticular features characteristic of the eighth abdominal segment. Heterozygotes from homozygous ovaries sometimes die as late embryos displaying relatively mild homeotic effects of the head and mesothorax or slightly incomplete head involution or both, but often hatch and die during larval or pupal stages. Rarely, adults eclose, often with appendages that are crippled or are missing owing to failure of imaginal-disc evagination (Denell). Most embryos produced by oocytes hemizygous for phob and phoc, achieved by pole-cell transplantation, fail to form cuticle, even with a wild-type paternal complement; a few of the latter genotype produce enough cuticle to reveal extensive defects in segmentation; setal belts usually missing or transformed; head involution fails; anterior hole present in most embryos (Breen and Duncan, 1986).