The gene Yolk protein 2 is referred to in FlyBase by the symbol Dmel\Yp2 (CG2979, FBgn0005391). It is a protein_coding_gene from Drosophila melanogaster. Based on sequence similarity, it is predicted to have molecular function: structural molecule activity. There is experimental evidence that it is involved in the biological process: neurogenesis. 15 alleles are reported. The phenotype of these alleles is annotated with: mesothoracic tergum. It has 2 annotated transcripts and 2 annotated polypeptides. Protein features are: Lipase; Lipase, N-terminal. Summary of modENCODE Temporal Expression Profile: Temporal profile ranges from a peak of extremely high expression to a trough of extremely low expression. Peak expression observed in adult female stages. Summary of FlyAtlas Anatomical Expression Data: Expression at high levels in the following post-embryonic organs or tissues: adult head, adult eye, adult central nervous system, adult crop, adult hindgut, adult heart, adult fat body, adult female reproductive system, adult carcass. Expression at moderate levels in the following post-embryonic organs or tissues: adult salivary gland. Comments on Affy2 ProbeSet: ProbeSet 1623655_at completely aligns to an exonic region of the only FlyBase-annotated transcript isoform of Yp2. Gene sequence location is X:9944984..9946669.
User Contributed Data
Phenotypic Description from the Red Book (Lindsley
& Zimm 1992)
Gene/Allele symbols may differ
from current usage
Yp2
Structural gene for the yolk protein YP2 found in
recently-emerged female flies. Protein migrates at different
rates in SDS-polyacrylamide gels when encoded by the electrophoretic variants Yp2F (fast) and Yp2S (slow), alleles that
are female fertile and produce normal amounts of YP2. A
mutant Yp2M (=Yp212-1245) is female fertile but lays fewer
eggs than normal (Mohler, Postlethwait, and Shirk) and does
not contain yolk protein in the hemolymph or ovaries.
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FB2013_03
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Summary of FlyAtlas Anatomical Expression Data: Expression at high levels in the following post-embryonic organs or tissues: adult head, adult eye, adult central nervous system, adult crop, adult hindgut, adult heart, adult fat body, adult female reproductive system, adult carcass. Expression at moderate levels in the following post-embryonic organs or tissues: adult salivary gland.
[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
7.4
Larval Midgut
33.6
Larval Hindgut
10.5
Larval Malpighian Tubules
3.9
Larval Fat Body
26
Larval Salivary Gland
3.4
Larval Trachea
183.075
Larval Carcass
3.475
Adult Head
5771.2
Adult Eye
6134.55
Adult Brain
1232.6
Adult Thoracic-Abdominal Ganglion
1797.2
Adult Crop
1191.2
Adult Midgut
43.6
Adult Hindgut
2816.5
Adult Malpighian Tubules
898.8
Adult Fat Body
4427.3
Adult Salivary Gland
306.5
Adult Heart
7328.175
Adult VirginFemale Spermatheca
4427
Adult InseminatedFemale Spermatheca
4716.9
Adult Ovary
2686.3
Adult Testis
1.2
Adult Male Accessory Gland
17.6
Adult Carcass
7551.6
Expression Level Scale
None
Low
Moderate
High
Very high
Linear, scaled to Moderate expression
Tissue
Expression Level
Larval Central Nervous System
7.4
Larval Midgut
33.6
Larval Hindgut
10.5
Larval Malpighian Tubules
3.9
Larval Fat Body
26
Larval Salivary Gland
3.4
Larval Trachea
183.075
Larval Carcass
3.475
Adult Head
(5771.2)
Adult Eye
(6134.55)
Adult Brain
(1232.6)
Adult Thoracic-Abdominal Ganglion
(1797.2)
Adult Crop
(1191.2)
Adult Midgut
43.6
Adult Hindgut
(2816.5)
Adult Malpighian Tubules
(898.8)
Adult Fat Body
(4427.3)
Adult Salivary Gland
306.5
Adult Heart
(7328.175)
Adult VirginFemale Spermatheca
(4427)
Adult InseminatedFemale Spermatheca
(4716.9)
Adult Ovary
(2686.3)
Adult Testis
1.2
Adult Male Accessory Gland
17.6
Adult Carcass
(7551.6)
Expression Level Scale
None
Low
Moderate
High
Linear, scaled to High level expression
Tissue
Expression Level
Larval Central Nervous System
7.4
Larval Midgut
33.6
Larval Hindgut
10.5
Larval Malpighian Tubules
3.9
Larval Fat Body
26
Larval Salivary Gland
3.4
Larval Trachea
183.075
Larval Carcass
3.475
Adult Head
(5771.2)
Adult Eye
(6134.55)
Adult Brain
(1232.6)
Adult Thoracic-Abdominal Ganglion
(1797.2)
Adult Crop
(1191.2)
Adult Midgut
43.6
Adult Hindgut
(2816.5)
Adult Malpighian Tubules
898.8
Adult Fat Body
(4427.3)
Adult Salivary Gland
306.5
Adult Heart
(7328.175)
Adult VirginFemale Spermatheca
(4427)
Adult InseminatedFemale Spermatheca
(4716.9)
Adult Ovary
(2686.3)
Adult Testis
1.2
Adult Male Accessory Gland
17.6
Adult Carcass
(7551.6)
Expression Level Scale
None
Low
Moderate
High
Very high
Linear, scaled to Very high expression
Tissue
Expression Level
Larval Central Nervous System
7.4
Larval Midgut
33.6
Larval Hindgut
10.5
Larval Malpighian Tubules
3.9
Larval Fat Body
26
Larval Salivary Gland
3.4
Larval Trachea
183.075
Larval Carcass
3.475
Adult Head
5771.2
Adult Eye
6134.55
Adult Brain
1232.6
Adult Thoracic-Abdominal Ganglion
1797.2
Adult Crop
1191.2
Adult Midgut
43.6
Adult Hindgut
2816.5
Adult Malpighian Tubules
898.8
Adult Fat Body
4427.3
Adult Salivary Gland
306.5
Adult Heart
7328.175
Adult VirginFemale Spermatheca
4427
Adult InseminatedFemale Spermatheca
4716.9
Adult Ovary
2686.3
Adult Testis
1.2
Adult Male Accessory Gland
17.6
Adult Carcass
7551.6
Expression Level Scale
Very high
log, scaled to maximum expression level
Tissue
Expression Level
Larval Central Nervous System
7.4
Larval Midgut
33.6
Larval Hindgut
10.5
Larval Malpighian Tubules
3.9
Larval Fat Body
26
Larval Salivary Gland
3.4
Larval Trachea
183.075
Larval Carcass
3.475
Adult Head
5771.2
Adult Eye
6134.55
Adult Brain
1232.6
Adult Thoracic-Abdominal Ganglion
1797.2
Adult Crop
1191.2
Adult Midgut
43.6
Adult Hindgut
2816.5
Adult Malpighian Tubules
898.8
Adult Fat Body
4427.3
Adult Salivary Gland
306.5
Adult Heart
7328.175
Adult VirginFemale Spermatheca
4427
Adult InseminatedFemale Spermatheca
4716.9
Adult Ovary
2686.3
Adult Testis
1.2
Adult Male Accessory Gland
17.6
Adult Carcass
7551.6
Expression Level Scale
None
Low
Moderate
High
Very high
log, scaled to Moderate expression
Tissue
Expression Level
Larval Central Nervous System
7.4
Larval Midgut
33.6
Larval Hindgut
10.5
Larval Malpighian Tubules
3.9
Larval Fat Body
26
Larval Salivary Gland
3.4
Larval Trachea
183.075
Larval Carcass
3.475
Adult Head
(5771.2)
Adult Eye
(6134.55)
Adult Brain
(1232.6)
Adult Thoracic-Abdominal Ganglion
(1797.2)
Adult Crop
(1191.2)
Adult Midgut
43.6
Adult Hindgut
(2816.5)
Adult Malpighian Tubules
(898.8)
Adult Fat Body
(4427.3)
Adult Salivary Gland
306.5
Adult Heart
(7328.175)
Adult VirginFemale Spermatheca
(4427)
Adult InseminatedFemale Spermatheca
(4716.9)
Adult Ovary
(2686.3)
Adult Testis
1.2
Adult Male Accessory Gland
17.6
Adult Carcass
(7551.6)
Expression Level Scale
None
Low
Moderate
High
log, scaled to High level expression
Tissue
Expression Level
Larval Central Nervous System
7.4
Larval Midgut
33.6
Larval Hindgut
10.5
Larval Malpighian Tubules
3.9
Larval Fat Body
26
Larval Salivary Gland
3.4
Larval Trachea
183.075
Larval Carcass
3.475
Adult Head
(5771.2)
Adult Eye
(6134.55)
Adult Brain
1232.6
Adult Thoracic-Abdominal Ganglion
(1797.2)
Adult Crop
1191.2
Adult Midgut
43.6
Adult Hindgut
(2816.5)
Adult Malpighian Tubules
898.8
Adult Fat Body
(4427.3)
Adult Salivary Gland
306.5
Adult Heart
(7328.175)
Adult VirginFemale Spermatheca
(4427)
Adult InseminatedFemale Spermatheca
(4716.9)
Adult Ovary
(2686.3)
Adult Testis
1.2
Adult Male Accessory Gland
17.6
Adult Carcass
(7551.6)
Expression Level Scale
None
Low
Moderate
High
Very high
log, scaled to Very high expression
Tissue
Expression Level
Larval Central Nervous System
7.4
Larval Midgut
33.6
Larval Hindgut
10.5
Larval Malpighian Tubules
3.9
Larval Fat Body
26
Larval Salivary Gland
3.4
Larval Trachea
183.075
Larval Carcass
3.475
Adult Head
5771.2
Adult Eye
6134.55
Adult Brain
1232.6
Adult Thoracic-Abdominal Ganglion
1797.2
Adult Crop
1191.2
Adult Midgut
43.6
Adult Hindgut
2816.5
Adult Malpighian Tubules
898.8
Adult Fat Body
4427.3
Adult Salivary Gland
306.5
Adult Heart
7328.175
Adult VirginFemale Spermatheca
4427
Adult InseminatedFemale Spermatheca
4716.9
Adult Ovary
2686.3
Adult Testis
1.2
Adult Male Accessory Gland
17.6
Adult Carcass
7551.6
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 extremely high expression to a trough of extremely low expression. Peak expression observed 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 ( 511 )
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.
The p47 polypeptide seen previously in ACF (ATP-utilizing chromatin assembly and remodeling factor) fractions (FBrf0095281) has been found to be identical to Yp2 and appears to have been a contaminant in these earlier ACF fractions.
20-Hydroxyecdysone, but not juvenile hormone, regulation of yolk protein gene expression can be mapped to cis-acting DNA sequences. It is not clear whether regulation by 20-hydroxyecdysone is direct or indirect. Methoprene up-regulation is only observed when native yolk protein genes are assayed, suggesting that it may operate through influencing stability of the message.
By comparing methylation by Ecol\dam methylase between euchromatic and heterochromatic genes it was determined that the heterochromatic state does not prevent methylase accessibility in vivo.
srp is expressed in the ovaries of adult flies where it produces an ovary specific protein isoform. The srp protein binds to a 12bp ovarian follicle cell-specific regulatory element located between the divergently transcribed Yp1 and Yp2. The 12bp element activates both in vivo and in vitro transcription of Yp1 and Yp2.
Insertion of the gypsy\su(Hw)BR into the Yp1Yp2 intergenic region does not alter temporal or tissue-specific expression of the Adh or Ecol\lacZ reporter genes but does repress the Yp1Yp2 fat body enhancer elements.
The yolk protein genes Yp1 and Yp2 are only expressed in the ovary and fat body of females if they are supplied with proteinaceous food. Several regulatory regions have been shown to independently confer nutritional regulation on the expression of Yp1 and Yp2.
Newly synthesised yolk proteins in normal and mutant strains share secretory vesicles with putative vitelline membrane proteins. Translocation of follicle cell yolk protein is not through the membrane along the interfollicular spaces, but directly through plasmalemma facing the oocyte.
Female flies with varying numbers of Yp1, Yp2 and Yp3 genes have been generated. Each yolk protein gene makes an equivalent contribution to the fecundity and fertility of the female, and they do not individually provide unique functions to the embryo. The number of eggs laid by a female depends on the number of genes encoding yolk proteins present in the genome, and the probability of an egg producing an adult depends on the number of yolk protein genes present in the mother.
The male and female products of dsx when expressed in E.coli bind specifically to the fat body enhancer (FBE) of Yp1 and Yp2. This demonstrates a direct interaction between the sex determination hierarchy and a target gene.
Yp1 and Yp2 are transcribed in the same sub-populations of ovarian follicle cells. This expression is directed by two enhancers: ovarian enhancer 1, located in the 1226bp intergenic region, and ovarian enhancer 2 located within the first exon of Yp2.
Two cis-acting regions influence the transcription of both Yp1 and Yp2 in the ovaries. One is located in the 1224bp intergenic region and determines the stage and cell type specificity of ovarian transcription. The other is in the first intron of Yp2 and acts across the Yp2 promoter region to stimulate Yp1 transcription in ovaries.
The sex-, time- and tissue-specific expression of the Yp1 and Yp2 genes, divergently transcribed and separated by 1225bp, indicates that there are two tissue-specifying elements acting on each gene. One is necessary for expression in fat body and the other for expression in the ovary.
Structural gene for the yolk protein YP2 found in recently-emerged female flies. Protein migrates at different rates in SDS-polyacrylamide gels when encoded by the electrophoretic variants Yp2F (fast) and Yp2S (slow), alleles that are female fertile and produce normal amounts of YP2. A mutant Yp2M (=Yp212-1245) is female fertile but lays fewer eggs than normal (Mohler, Postlethwait and Shirk) and does not contain yolk protein in the hemolymph or ovaries.