The gene absent, small, or homeotic discs 1 is referred to in FlyBase by the symbol Dmel\ash1 (CG8887, FBgn0005386). It is a protein_coding_gene from Drosophila melanogaster. There is experimental evidence that it has the molecular function: histone-lysine N-methyltransferase activity; single-stranded RNA binding; histone methyltransferase activity (H3-K4 specific); histone methyltransferase activity. There is experimental evidence that it is involved in the biological process: histone methylation; oviposition; regulation of transcription, DNA-dependent; embryonic development via the syncytial blastoderm; histone H3-K4 methylation; chromatin-mediated maintenance of transcription; oogenesis. 48 alleles are reported. The phenotypes of these alleles are annotated with: abdominal segment 6; abdominal segment; haltere; abdominal segment 2; heart primordium; haltere disc; wing; imaginal disc. It has 2 annotated transcripts and 2 annotated polypeptides. Protein features are: AT hook, DNA-binding motif; AWS; Bromo adjacent homology (BAH) domain; Post-SET domain; SET domain; Zinc finger, FYVE/PHD-type; Zinc finger, PHD-finger; Zinc finger, PHD-type; Zinc finger, PHD-type, conserved site; Zinc finger, RING/FYVE/PHD-type. 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 within 00-12 hour embryonic stages, in adult female stages. Summary of FlyAtlas Anatomical Expression Data: Expression at moderate levels in the following post-embryonic organs or tissues: adult ovary. Comments on Affy2 ProbeSet: ProbeSet 1629321_at completely aligns to an exonic region of the only FlyBase-annotated transcript isoform of ash1. Gene sequence location is 3L:19583873..19591855.
User Contributed Data
External Summaries
Phenotypic Description from the Red Book (Lindsley
& Zimm 1992)
Gene/Allele symbols may differ
from current usage
ash1: absent, small, or homeotic discs
Most alleles homozygous lethal; stage of lethality
variable. Surviving and pharate adults display transformations including haltere to wing, first and third legs to
second leg, genitalia to leg or antenna; ash18 and ash110 show
transformation of posterior to anterior wing margin. Homeotic
transformations also seen in clones of homozygous cells in
otherwise heterozygous flies. Larvae homozygous for ash112, a
severe allele, displays a high incidence of failure to form
imaginal disks, especially antennal, genital, haltere, and
wing disks.
dash: discs absent, small, or homeotic (A. Shearn)
Homozygotes lethal at prepupal-pupal stage; imaginal
discs described as homeotic, with the second leg and the wing
discs described as like engrailed. Disc and cell autonomous.
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ash1 transcripts are present at all stages of development but are less abundant in larvae than in pupae. In ovaries, transcripts are detected in nurse cells and are most abundant in stage 10 egg chambers. ash1 transcripts are detected in preblastoderm and blastoderm embryos and at later stages. In third instar larvae, transcripts are detected in imaginal discs but not in most larval tissues.
Summary of FlyAtlas Anatomical Expression Data: Expression at moderate levels in the following post-embryonic organs or tissues: adult ovary.
[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
61.475
Larval Midgut
27.8
Larval Hindgut
24.9
Larval Malpighian Tubules
27
Larval Fat Body
28.9
Larval Salivary Gland
31.3
Larval Trachea
27.4
Larval Carcass
29.5
Adult Head
26.1
Adult Eye
23.325
Adult Brain
60.4
Adult Thoracic-Abdominal Ganglion
44.7
Adult Crop
23.6
Adult Midgut
27.9
Adult Hindgut
30.2
Adult Malpighian Tubules
15.3
Adult Fat Body
27.1
Adult Salivary Gland
34.4
Adult Heart
16.75
Adult VirginFemale Spermatheca
8.3
Adult InseminatedFemale Spermatheca
14.2
Adult Ovary
118.1
Adult Testis
51.5
Adult Male Accessory Gland
19.1
Adult Carcass
31.8
Expression Level Scale
None
Low
Moderate
Linear, scaled to Moderate expression
Tissue
Expression Level
Larval Central Nervous System
61.475
Larval Midgut
27.8
Larval Hindgut
24.9
Larval Malpighian Tubules
27
Larval Fat Body
28.9
Larval Salivary Gland
31.3
Larval Trachea
27.4
Larval Carcass
29.5
Adult Head
26.1
Adult Eye
23.325
Adult Brain
60.4
Adult Thoracic-Abdominal Ganglion
44.7
Adult Crop
23.6
Adult Midgut
27.9
Adult Hindgut
30.2
Adult Malpighian Tubules
15.3
Adult Fat Body
27.1
Adult Salivary Gland
34.4
Adult Heart
16.75
Adult VirginFemale Spermatheca
8.3
Adult InseminatedFemale Spermatheca
14.2
Adult Ovary
118.1
Adult Testis
51.5
Adult Male Accessory Gland
19.1
Adult Carcass
31.8
Expression Level Scale
None
Low
Moderate
High
Linear, scaled to High level expression
Tissue
Expression Level
Larval Central Nervous System
61.475
Larval Midgut
27.8
Larval Hindgut
24.9
Larval Malpighian Tubules
27
Larval Fat Body
28.9
Larval Salivary Gland
31.3
Larval Trachea
27.4
Larval Carcass
29.5
Adult Head
26.1
Adult Eye
23.325
Adult Brain
60.4
Adult Thoracic-Abdominal Ganglion
44.7
Adult Crop
23.6
Adult Midgut
27.9
Adult Hindgut
30.2
Adult Malpighian Tubules
15.3
Adult Fat Body
27.1
Adult Salivary Gland
34.4
Adult Heart
16.75
Adult VirginFemale Spermatheca
8.3
Adult InseminatedFemale Spermatheca
14.2
Adult Ovary
118.1
Adult Testis
51.5
Adult Male Accessory Gland
19.1
Adult Carcass
31.8
Expression Level Scale
None
Low
Moderate
High
Very high
Linear, scaled to Very high expression
Tissue
Expression Level
Larval Central Nervous System
61.475
Larval Midgut
27.8
Larval Hindgut
24.9
Larval Malpighian Tubules
27
Larval Fat Body
28.9
Larval Salivary Gland
31.3
Larval Trachea
27.4
Larval Carcass
29.5
Adult Head
26.1
Adult Eye
23.325
Adult Brain
60.4
Adult Thoracic-Abdominal Ganglion
44.7
Adult Crop
23.6
Adult Midgut
27.9
Adult Hindgut
30.2
Adult Malpighian Tubules
15.3
Adult Fat Body
27.1
Adult Salivary Gland
34.4
Adult Heart
16.75
Adult VirginFemale Spermatheca
8.3
Adult InseminatedFemale Spermatheca
14.2
Adult Ovary
118.1
Adult Testis
51.5
Adult Male Accessory Gland
19.1
Adult Carcass
31.8
Expression Level Scale
Very high
log, scaled to maximum expression level
Tissue
Expression Level
Larval Central Nervous System
61.475
Larval Midgut
27.8
Larval Hindgut
24.9
Larval Malpighian Tubules
27
Larval Fat Body
28.9
Larval Salivary Gland
31.3
Larval Trachea
27.4
Larval Carcass
29.5
Adult Head
26.1
Adult Eye
23.325
Adult Brain
60.4
Adult Thoracic-Abdominal Ganglion
44.7
Adult Crop
23.6
Adult Midgut
27.9
Adult Hindgut
30.2
Adult Malpighian Tubules
15.3
Adult Fat Body
27.1
Adult Salivary Gland
34.4
Adult Heart
16.75
Adult VirginFemale Spermatheca
8.3
Adult InseminatedFemale Spermatheca
14.2
Adult Ovary
118.1
Adult Testis
51.5
Adult Male Accessory Gland
19.1
Adult Carcass
31.8
Expression Level Scale
None
Low
Moderate
log, scaled to Moderate expression
Tissue
Expression Level
Larval Central Nervous System
61.475
Larval Midgut
27.8
Larval Hindgut
24.9
Larval Malpighian Tubules
27
Larval Fat Body
28.9
Larval Salivary Gland
31.3
Larval Trachea
27.4
Larval Carcass
29.5
Adult Head
26.1
Adult Eye
23.325
Adult Brain
60.4
Adult Thoracic-Abdominal Ganglion
44.7
Adult Crop
23.6
Adult Midgut
27.9
Adult Hindgut
30.2
Adult Malpighian Tubules
15.3
Adult Fat Body
27.1
Adult Salivary Gland
34.4
Adult Heart
16.75
Adult VirginFemale Spermatheca
8.3
Adult InseminatedFemale Spermatheca
14.2
Adult Ovary
118.1
Adult Testis
51.5
Adult Male Accessory Gland
19.1
Adult Carcass
31.8
Expression Level Scale
None
Low
Moderate
High
log, scaled to High level expression
Tissue
Expression Level
Larval Central Nervous System
61.475
Larval Midgut
27.8
Larval Hindgut
24.9
Larval Malpighian Tubules
27
Larval Fat Body
28.9
Larval Salivary Gland
31.3
Larval Trachea
27.4
Larval Carcass
29.5
Adult Head
26.1
Adult Eye
23.325
Adult Brain
60.4
Adult Thoracic-Abdominal Ganglion
44.7
Adult Crop
23.6
Adult Midgut
27.9
Adult Hindgut
30.2
Adult Malpighian Tubules
15.3
Adult Fat Body
27.1
Adult Salivary Gland
34.4
Adult Heart
16.75
Adult VirginFemale Spermatheca
8.3
Adult InseminatedFemale Spermatheca
14.2
Adult Ovary
118.1
Adult Testis
51.5
Adult Male Accessory Gland
19.1
Adult Carcass
31.8
Expression Level Scale
None
Low
Moderate
High
Very high
log, scaled to Very high expression
Tissue
Expression Level
Larval Central Nervous System
61.475
Larval Midgut
27.8
Larval Hindgut
24.9
Larval Malpighian Tubules
27
Larval Fat Body
28.9
Larval Salivary Gland
31.3
Larval Trachea
27.4
Larval Carcass
29.5
Adult Head
26.1
Adult Eye
23.325
Adult Brain
60.4
Adult Thoracic-Abdominal Ganglion
44.7
Adult Crop
23.6
Adult Midgut
27.9
Adult Hindgut
30.2
Adult Malpighian Tubules
15.3
Adult Fat Body
27.1
Adult Salivary Gland
34.4
Adult Heart
16.75
Adult VirginFemale Spermatheca
8.3
Adult InseminatedFemale Spermatheca
14.2
Adult Ovary
118.1
Adult Testis
51.5
Adult Male Accessory Gland
19.1
Adult Carcass
31.8
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 within 00-12 hour embryonic 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 ( 24 )
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.
Transcriptional activation by ash1 coincides with methylation of lysines 4 and 9 of His3 and lysine 20 of His4 at the promoter of ash1 target genes. Epigenetic activation of Ubx transcription coincides with trivalent methylation by ash1 and recruitment of brm.
ash1 and ash2 are trans-regulatory elements of homeotic selector gene regulation. ash1 is required for the functioning of the Ubx ABX/BX enhancer element, regulation involves different cis-regulatory regions that than of ash1.
Genetic tests were used to confirm that ash1 and ash2 belong to a functionally related class of genes, mutations in which cause a wide variety of homeotic transformations that are similar to the transformations caused by trx. Double heterozygotes of ash1 alleles and Df(3R)red-P93 show a significant penetrance of homeotic transformations. Heterozygosity of ash1 alleles increases the penetrance of homeotic transformations in progeny derived from fs(1)h1 hemizygous mothers: the increase in penetrance is proportional to the loss of ash1 function.
A member of the trithorax group of genes. Encodes a Zinc finger protein required for imaginal disc and histoblast development, and for oogenesis.
Most alleles homozygous lethal; stage of lethality variable. Surviving and pharate adults display transformations including haltere to wing, first and third legs to second leg, genitalia to leg or antenna;
Anent the Genomics of Spermatogenesis in Drosophila melanogaster. [FBrf0220812]
Hallson et al., 2012, Genetics 190(1): 91--100
dSet1 Is the Main H3K4 Di- and Tri-Methyltransferase Throughout Drosophila Development. [FBrf0217167]
Popkova et al., 2012, PLoS Genet. 8(12): e1003159
Polycomb controls gliogenesis by regulating the transient expression of the gcm/glide fate determinant. [FBrf0220515]
Riddle et al., 2012, PLoS Genet. 8(9): e1002954
Enrichment of HP1a on Drosophila Chromosome 4 Genes Creates an Alternate Chromatin Structure Critical for Regulation in this Heterochromatic Domain. [FBrf0219520]
Sakoparnig et al., 2012, J. Comput. Biol. 19(2): 126--138
Binding profiles of chromatin-modifying proteins are predictive for transcriptional activity and promoter-proximal pausing. [FBrf0217402]
Kharchenko et al., 2011, Nature 471(7339): 480--485
Comprehensive analysis of the chromatin landscape in Drosophila melanogaster. [FBrf0213294]
Rodriguez-Jato et al., 2011, PLoS ONE 6(12): e27479
Drosophila melanogaster dHCF Interacts with both PcG and TrxG Epigenetic Regulators. [FBrf0216958]
Sultana et al., 2011, Nucleic Acids Res. 39(9): 3543--3557
A BEAF dependent chromatin domain boundary separates myoglianin and eyeless genes of Drosophila melanogaster. [FBrf0213641]