FB2024_03 , released June 25, 2024
Allele: Hsap\APP2xAPP.SP.UAS
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General Information
Symbol
Hsap\APP2xAPP.SP.UAS
Species
H. sapiens
Name
FlyBase ID
FBal0285873
Feature type
allele
Associated gene
Associated Insertion(s)
Carried in Construct
Also Known As
UAS-Aβ42, UAS-Aβ422X, UAS-Aβ42(Human)
Key Links
Transgenic product class
Nature of the Allele
Transgenic product class
Progenitor genotype
Carried in construct
Cytology
Description

UAS regulatory sequences and a hsp70 minimal promoter drive expression of two copies of a 161 nucleotide fragment of Hsap\APP containing the Aβ sequence (corresponding to 1-42 amino acid residues. To ensure this fragment is secreted, a 232 nucleotide fragment containing the signal peptide from the aos gene.

Allele components
Component
Use(s)
Encoded product / tool
Mutations Mapped to the Genome
Curation Data
Type
Location
Additional Notes
References
Variant Molecular Consequences
Associated Sequence Data
DNA sequence
Protein sequence
 
Expression Data
Reporter Expression
Additional Information
Statement
Reference
 
Marker for
Reflects expression of
Reporter construct used in assay
Human Disease Associations
Disease Ontology (DO) Annotations
Models Based on Experimental Evidence ( 1 )
Modifiers Based on Experimental Evidence ( 1 )
Disease
Interaction
References
is ameliorated by Nsun2UAS.cAa
is exacerbated by Rab4UASp.YFP
is exacerbated by Rab7UAS.GFP
is ameliorated by EndoAUAS.cVa
is exacerbated by Rab10UASp.YFP
is ameliorated by AmphA.UAS
is ameliorated by EndoAUAS.cUa
is exacerbated by Rab10UAS.cUa
is exacerbated by Rab4UAS.cUa
is ameliorated by Rab5UAS.EGFP
is ameliorated by lapA.UAS
is exacerbated by lapHMS01939
is exacerbated by azotGD7219
is ameliorated by azotmCherry
Comments on Models/Modifiers Based on Experimental Evidence ( 0 )
 
Disease-implicated variant(s)
 
Phenotypic Data
Phenotypic Class
Phenotype Manifest In
Detailed Description
Statement
Reference

Adulthood-only expression of Hsap\APP2xAPP.SP.UAS under the control of Scer\GAL4elav.Switch.PO (RU486-induced) leads to decreased climbing activity.

Eye disc clones expressing Hsap\APP2xAPP.SP.UAS under the control of Scer\GAL4Act5C.PI occupy a smaller area than control clones.

Expressing Hsap\APP2xAPP.SP.UAS under the control of Scer\GAL4GMR.PF induces a rough eye phenotype and induces significant apoptosis (cleaved DCP1 labelling or TUNEL assay) in the eye disc and in the adult optic lobe, as compared to controls.

Adulthood-only expression of Hsap\APP2xAPP.SP.UAS under the combined control of Scer\GAL4elav.Switch.PO and RU486 feeding results in increased apoptosis (TUNEL assay) and decreased mitotic index (phospho-H3 staining) in the optic lobe, as well as increased necrosis (propidium iodine staining) and increased vacuolization of the brain. These adults are short-lived and show behavioral defects (decreased activity time, shorter walks, and ataxia), and impaired long-term memory (in courtship suppression assays).

Adult flies expressing Hsap\APP2xAPP.SP.Scer\UAS under the control of either Scer\GAL4elav-C155 or Scer\GAL4Lk.2.2 combined with Tub-Gal80[ts] to limit the expression to adulthood exhibit inflated, liquid-filled abdomen and proboscis, the phenotype grows more severe until death. Continuous expression under Scer\GAL4Toll-6-D42 results in severe wing defects (deformed, unfurled wings) in adult flies but no evidence of increase in cell death is seen in the developing wing discs from third instar larvae. However, when driven by Scer\GAL4e22c, excessive apoptotic activity (detected by Casp3 immunolabelling) is observed.

Flies expressing Hsap\APP2xAPP.SP.Scer\UAS under the control of Scer\GAL4GMR.PU exhibit a dramatic reduction in the size of the eye, disorganization of the ommatidia, depigmentation and accumulation of necrotic spots in the eye, as well as fusion and rupture of lenses, as compared to controls. Larval eye discs in these flies exhibit increased apoptosis throughout the posterior eye disc, as compared to controls.

Adult mushroom bodies in flies expressing Hsap\APP2xAPP.SP.Scer\UAS under the control of Scer\GAL4ey-OK107 show increased cell death in the Kenyon cell clusters, thinner Kenyon cell axonal lobes, and larger calyces at 1 day old but smaller calyces at 20 or 40 days old, as compared to controls.

Flies expressing Hsap\APP2xAPP.SP.Scer\UAS under the control of Scer\GAL4elav.PU exhibit progressive climbing defects and reduced lifespan.

Expression of Hsap\APP2xAPP.SP.Scer\UAS under the control of Scer\GAL4GMR.PU results in a disruption of the ommatidial lattice and glassy eye phenotype in adults.

Flies expressing Scer\GAL4GMR.PU>Hsap\APP2xAPP.SP.Scer\UAS display small, glassy, depigmented eyes compared with wild-type. At higher magnification, the eye lattice is highly disorganized, ommatidia are fused, and the lenses show holes owing to late cell death.

Expression of Hsap\APP2xAPP.SP.Scer\UAS under the control of Scer\GAL4ey-OK107 results in thinner axonal projections from the mushroom bodies and a progressive loss of calyx volume compared with wild-type.

Flies expressing Hsap\APP2xAPP.SP.Scer\UAS pan-neurally under the control of Scer\GAL4elav.PU show progressive locomotor dysfunction.

Kenyon cell clusters of 20 day old wild-type flies do not show apoptosis. In contrast, age-matched flies expressing Hsap\APP2xAPP.SP.Scer\UAS under the control of Scer\GAL4ey-OK107 display more than 20 apoptotic cells per Kenyon cell cluster.

Expression of bi-cistronic Hsap\APP2xAPP.SP.Scer\UAS in the developing eye under the control of Scer\GAL4GMR.PF results in small and disorganised eyes containing black, necrotic spots. The retinae of young flies (day 1 post-eclosion) are also thin and disorganised, with poorly differentiated photoreceptors and lenses. The same phenotype is seen upon expression of Hsap\APP2xAPP.SP.Scer\UAS in photoreceptors, under the control of Scer\GAL4elav-C155.

Flies expressing Hsap\APP2xAPP.SP.Scer\UAS in the developing eye (under the control of Scer\GAL4GMR.PF) for 20 days develop increased disorganisation and vacuolation of the retina.

Expression of Hsap\APP2xAPP.SP.Scer\UAS in the CNS (under the control of Scer\GAL4elav-C155) results in 20% eclosion of adult flies (i.e. 80% lethality).

External Data
Interactions
Show genetic interaction network for Enhancers & Suppressors
Phenotypic Class
Enhanced by
Statement
Reference
NOT Enhanced by
Statement
Reference
Suppressed by
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Reference
NOT suppressed by
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Reference
Enhancer of
NOT Enhancer of
NOT Suppressor of
Other
Statement
Reference
Phenotype Manifest In
Enhanced by
Statement
Reference

Hsap\APP2xAPP.SP.UAS, Scer\GAL4elav.Switch.PO has adult brain | RU486 conditional phenotype, enhanceable by azotKO/azotKO

NOT Enhanced by
Suppressed by
Statement
Reference

Hsap\APP2xAPP.SP.UAS, Scer\GAL4elav.Switch.PO has adult brain | RU486 conditional phenotype, suppressible by azotKO/azotKO

NOT suppressed by
Statement
Reference

Hsap\APP2xAPP.SP.UAS, Scer\GAL4GMR.PS has eye phenotype, non-suppressible by NC2αEY18723/NC2alpha[+]

Enhancer of
NOT Enhancer of
Statement
Reference
NOT Suppressor of
Statement
Reference
Other
Additional Comments
Genetic Interactions
Statement
Reference
Xenogenetic Interactions
Statement
Reference

The inflated abdomen and proboscis phenotype (that grows progressively more severe until death) induced by adult-onset expression of Hsap\APP2xAPP.SP.Scer\UAS under the control of Scer\GAL4Lk.2.2 (combined with Tub-Gal4 to limit the expression to adulthood) is completely suppressed in all flies by co-expression of Pi3K92ECAAX.Scer\UAS. Similarly, the increased apoptotic activity (detected by Casp3 immunolabelling) observed in third instar larval wing discs expressing Hsap\APP2xAPP.SP.Scer\UAS under Scer\GAL4e22c is significantly suppressed by Pi3K92ECAAX.Scer\UAS co-expression. Expresion of Hsap\APP2xAPP.SP.Scer\UAS under Scer\GAL4Toll-6-D42 either on its own or in combination with Pi3K92ECAAX.Scer\UAS does not induce cell death in larval wing discs.

Flies co-expressing Hsap\APP2xAPP.SP.Scer\UAS and BacA\p35Scer\UAS.cUa under either Scer\GAL4Toll-6-D42 or Scer\GAL4e22c are lethal and do not reach adulthood.

Co-expression of Hsap\HSPA1LScer\UAS.sec or Hsap\HSPA1LK71E.Scer\UAS.sec (but not Hsap\HSPA1LScer\UAS.cWa, Hsap\HSPA1LSBD-GG.Scer\UAS.sec, Hsap\HSPA1LSBD-GY.Scer\UAS.sec or Hsc70-3Scer\UAS.cEa) completely suppresses the eye phenotypes of adult flies expressing Hsap\APP2xAPP.SP.Scer\UAS under the control of Scer\GAL4GMR.PU.

Co-expression of Hsap\HSPA1LScer\UAS.sec (but not Hsap\HSPA1LScer\UAS.cWa) partially suppresses the increased cell death observed in larval posterior eye discs in flies expressing Hsap\APP2xAPP.SP.Scer\UAS under the control of Scer\GAL4GMR.PU.

Co-expression of either Hsap\HSPA1LScer\UAS.sec or Hsap\HSPA1LScer\UAS.cWa partially suppresses the increased cell death observed in adult Kenyon cells of the mushroom body, and enhances the increased size of the calyx at 1 day old; expression of Hsap\HSPA1LScer\UAS.sec (but not Hsap\HSPA1LScer\UAS.cWa) suppresses the thin Kenyon cell axons, and suppresses the decreased size of the calyx at 20 and 40 days old in flies expressing Hsap\APP2xAPP.SP.Scer\UAS under the control of Scer\GAL4ey-OK107.

Co-expression of Hsap\HSPA1LScer\UAS.sec (but not Hsap\HSPA1LScer\UAS.cWa) partially suppresses the locomotor defects and reduced lifespan of flies expressing Hsap\APP2xAPP.SP.Scer\UAS under the control of Scer\GAL4elav.PU.

The glassy eye phenotype and disrupted ommatidial lattice observed in adult flies expressing Hsap\APP2xAPP.SP.Scer\UAS under the control of Scer\GAL4GMR.PU is significantly worsened by co-expression of either Rho1dsRNA.Scer\UAS or PgmHMS01333 RNAi with necrotic spots appearing in the posterior eye but is not affected by combination with CG11739d06383.

Co-expression of Hsap\APP2xAPP.SP.Scer\UAS with Mus\scFv9.Scer\UAS.T:Hsap\MYC,T:Zzzz\His6 partially suppresses the Hsap\APP2xAPP.SP.Scer\UAS phenotype, with larger eyes and improved pigmentation. The eyes of these flies are better organized, with fewer fused ommatidia, and better differentiation of lenses with fewer broken lenses.

Co-expression of Hsap\APP2xAPP.SP.Scer\UAS with Mus\scFv42.2.Scer\UAS.T:Hsap\MYC,T:Zzzz\His6 partially suppresses the Hsap\APP2xAPP.SP.Scer\UAS phenotype, with larger eyes and improved pigmentation. The eyes of these flies are better organized, with fewer fused ommatidia, and better differentiation of lenses with fewer broken lenses.

Co-expression of Mus\scFv42.2.Scer\UAS.T:Hsap\MYC,T:Zzzz\His6 partially suppresses the size defects in the mushroom body lobes resulting from the expression of Scer\GAL4ey-OK107>Hsap\APP2xAPP.SP.Scer\UAS.

Co-expression of the combination of Mus\scFv42.2.Scer\UAS.T:Hsap\MYC,T:Zzzz\His6 and Mus\scFv9.Scer\UAS.T:Hsap\MYC,T:Zzzz\His6 with Scer\GAL4ey-OK107>Hsap\APP2xAPP.SP.Scer\UAS produces dorsal and medial mushroom body lobes that are slightly larger than wild-type.

ksrj5E2 mildly suppresses the eye phenotype seen in flies expressing Hsap\APP2xAPP.SP.Scer\UAS under the control of Scer\GAL4GMR.PS.

One copy of NC2αEY18723 does not suppress the eye phenotype seen in flies expressing Hsap\APP2xAPP.SP.Scer\UAS under the control of Scer\GAL4GMR.PS.

Expression of SdhBEY12081 does not suppress the eye phenotype seen in flies expressing Hsap\APP2xAPP.SP.Scer\UAS under the control of Scer\GAL4GMR.PS.

One copy of sggG0335 suppresses the eye phenotype seen in flies expressing Hsap\APP2xAPP.SP.Scer\UAS under the control of Scer\GAL4GMR.PS.

Co-expression of Hsap\APP2xAPP.SP.Scer\UAS and Xbp1d08698 in the developing eye under the control of Scer\GAL4GMR.PF significantly improves both eye organisation and size compared to expression of Hsap\APP2xAPP.SP.Scer\UAS alone.

Co-expression of Mmus\Xbp1Scer\UAS.cCTa with Hsap\APP2xAPP.SP.Scer\UAS (both under the control of Scer\GAL4GMR.PF) results in bigger, better-organised eyes that lack necrotic spots. Additionally, retinae are thicker and photoreceptors and lenses are better differentiated.

Hsap\APP2xAPP.SP.Scer\UAS flies co-expressing either Mmus\Xbp1Scer\UAS.cCTa or Xbp1d08698 in the developing eye (under the control of Scer\GAL4GMR.PF) show milder degenerative changes in the retina compared to flies expressing Hsap\APP2xAPP.SP.Scer\UAS, indicating Mmus\Xbp1 or Xbp1 protects against the progressive degeneration of photoreceptors induced by Hsap\APP.

In flies co-expressing Hsap\APP2xAPP.SP.Scer\UAS and Xbp1GD4745 in the developing eye (under the control of Scer\GAL4GMR.PF) aged 20 days, the retinae undergo dramatic degeneration, leaving large holes underneath the cornea.

A heterozygous RyR16 background significantly suppresses the eye degeneration seen upon expression of Hsap\APP2xAPP.SP.Scer\UAS under the control of Scer\GAL4GMR.PF. Sixty percent of the flies expressing only Hsap\APP2xAPP.SP.Scer\UAS show a highly disorganised eye surface and short retina with small photoreceptors. On the other hand, 62% of the flies with a heterozygous RyR16 background exhibit mild eye disorganisation with well-developed retinae and long photoreceptors. There is a significant improvement in eye organisation in flies carrying RyR16.

Viability of flies expressing Hsap\APP2xAPP.SP.Scer\UAS in the CNS (under the control of Scer\GAL4elav-C155) is completely restored in a heterozygous RyR16 background.

Complementation and Rescue Data
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External Crossreferences and Linkouts ( 0 )
Synonyms and Secondary IDs (2)
Reported As
Symbol Synonym
Hsap\APP2xAPP.SP.Scer\UAS
Hsap\APP2xAPP.SP.UAS
Name Synonyms
Secondary FlyBase IDs
    References (20)