FB2024_03 , released June 25, 2024
Allele: Hsap\HTTQ128.UAS
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General Information
Symbol
Hsap\HTTQ128.UAS
Species
H. sapiens
Name
FlyBase ID
FBal0156385
Feature type
allele
Associated gene
Associated Insertion(s)
Carried in Construct
Also Known As
UAS-Htt-Q128, UAS-HttQ128, Htt-Q128, HttQ128, UAS-Htt548aa-128Q, UAS-HTT-548-128Q
Key Links
Nature of the Allele
Progenitor genotype
Carried in construct
Cytology
Description

UASt sequences drive expression of the N terminal 548 aa of the Q128 Hsap\HTT cDNA, which encodes the pathogenic protein.

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 Atx2HMS01392
is ameliorated by Atx2HMS02726
is ameliorated by Atx2KK100423
is ameliorated by CrebAJF02189
is ameliorated by Fmr1GL00075
is ameliorated by Fmr1HMS00248
is ameliorated by PykGL00099
is ameliorated by nejHMS01507
is ameliorated by nejKK113191
is ameliorated by panΔN.UAS
is ameliorated by srlEY05931
is ameliorated by ItprJF01957
is ameliorated by PtenUAS.cUa
is ameliorated by foxoTM.UAS
is ameliorated by foxoUAS.cUa
is ameliorated by ktoHMS01062
is ameliorated by nejGD8975
is ameliorated by rho-5UAS.cZa
is exacerbated by rho-5KO1
is ameliorated by slmbUAS.cGa
Comments on Models/Modifiers Based on Experimental Evidence ( 0 )
 
Disease-implicated variant(s)
 
This allele represents a human variant implicated in disease.
HTT:p.Gln18[128]
Variants Synonym(s)
HTT:p.Gln18[128Gln]
HTT, (CAG)n REPEAT EXPANSION
Associated human disease model(s)
External database links
Comments concerning this variant
Phenotypic Data
Phenotypic Class
Phenotype Manifest In
Detailed Description
Statement
Reference

The expression of Hsap\HTTQ128.UAS under the control of Scer\GAL4repo.Switch.2301 from day 1 of adulthood (induced by feeding of RU486) leads to decreased lifespan and decreased climbing ability.

The expression of Hsap\HTTQ128.UAS under the control of Scer\GAL4P2.4.Pdf severely impairs circadian behavior, and leads to a severe decrease in the number of sLNv nurons in 10-days old adults.

Expressing Hsap\HTTQ128.UAS under the control of Scer\GAL4GMR.PF induces significant apoptosis (cleaved DCP1 labelling) in the eye disc, as compared to controls.

Most of the adult flies expressing Hsap\HTTQ128.Scer\UAS under the control of Scer\GAL4P2.4.Pdf show arrhythmic locomotor activity from the first day in constant darkness (DD) as well as poor consolidation of daily activity, whereas all control flies are rhythmic. The Hsap\HTTQ128.Scer\UAS-expressing flies have significantly fewer s-LNv somas that label positive for either Pdf or per, in contrast the number of Pdf-positive l-LNv neurons is comparable to controls but only about half of these is also positive for per. However, there is no significant difference in the number of Pdf+ s-LNv neurons between Hsap\HTTQ128.Scer\UAS-expressing flies that are (weakly) rhythmic and those completely arrhythmic and both these groups show Pdf immunoreactivity in the dorsal projections of s-LNv neurons. The Pdf levels in these dorsal projections oscillate after transfer to DD and while the peak coincides with the timing observed in control flies but the rise and fall of Pdf in Hsap\HTTQ128.Scer\UAS flies occurs earlier than in controls. per protein levels in the somas of l-LNv neurons do not oscillate and are very low relative to flies expressing Hsap\HTTQ0.Scer\UAS, whereas they oscillate with similar phase and overall intensity in other (Pdf-negative) neuronal groups (LNd, DN1, DN2 or the 5th s-LNv).

Adult flies expressing Hsap\HTTQ128.Scer\UAS continue to show anticipation of the dark-light transition even under low light intensity LD (light-dark) cycles and, like controls, show a clear oscillation in Pdf levels in s-LNv dorsal projections. On average, fewer per+ s-LNv somas are found in Hsap\HTTQ128.Scer\UAS expressing flies compared to Hsap\HTTQ0.Scer\UAS flies. The number of Pdf and per positive l-LNv somas are comparable between the two genotypes and in these neurons the per protein shows clear oscillation under LD although the amplitude is dampened in Hsap\HTTQ128.Scer\UAS flies compared to Hsap\HTTQ0.Scer\UAS.

Hsap\HTTQ128.Scer\UAS;Scer\GAL4P2.4.Pdf flies raised and maintained in constant light (LL) show a progressive loss of Pdf from s-LNv neurons' dorsal projections, flies maintained in LL, transferred to LD and then DD (the LL-LD regimen) show no Pdf+ s-LNv somas at age 23 and 28 days, not even after experiencing 5 days in LD. The numbers of Pdf+ l-LNv somas is comparable between regimens. Both LL-LD and LD-LD flies Scer\GAL4P2.4.Pdf>Hsap\HTTQ128.Scer\UAS flies exhibit activity profiles similar to their in-regimen controls and also show no differences in their morning and evening anticipation behavior relative to controls and across regimens.

Flies with expression of Hsap\HTTQ128.Scer\UAS driven by Scer\GAL4GMR.PU display a rough eye phenotype, with reduced numbers of ommatidia.

Expression of Hsap\HTTQ128.Scer\UAS under the control of Scer\GAL4GMR.PU results in a rough eye phenotype.

Expression of Hsap\HTTQ128.Scer\UAS under the control of Scer\GAL4elav.PLu results in time-dependent neurodegeneration. Newly eclosed flies have the normal complement of seven visible rhabdomeres per ommatidium, but this is reduced by day 10 post-eclosion. Treatment with meclizine partially rescues this phenotype.

Expression of Hsap\HTTQ128.Scer\UAS under the control of Scer\GAL4GMR.PU results in a loss of eye pigmentation, a rough eye phenotype and defects in the ommatidial array.

The loss of eye pigmentation seen in flies expressing Hsap\HTTQ128.Scer\UAS under the control of Scer\GAL4GMR.PU is significantly reduced by feeding with indomethacin.

Feeding with indomethacin increases the mean lifespan of flies expressing Hsap\HTTQ128.Scer\UAS under the control of Scer\GAL4elav.PU.

Expression of Hsap\HTTQ128.Scer\UAS under the control of an unknown Gal4 driver severely reduces adult survival rates.

One day old flies expressing Hsap\HTTQ128.Scer\UAS under the control of Scer\GAL4GMR.PF show photoreceptor degeneration, resulting in loss of rhabdomeres in each ommatidium. This photoreceptor degeneration is suppressed upon treatment with the HSF1-activating compound 17-AAG. Treatment with GA and RA modestly increases the number of rhabdomeres, as does the histone deacetylase inhibitor SB.

When Hsap\HDQ128.Scer\UAS is driven by Scer\GAL4GMR.PF a rough eye phenotype is seen. A loss of pigmentation is seen in the eye as well as abnormal bristle pattern and photoreceptor degeneration. A neurophysiological phenotype is also seen; mutant animals show reduced photoreceptor depolarisation and complete abolishment of synaptic transmission in response to light. Cytoplasmic Hsap\HD aggregates are seen in neurons, aggregates are transported in larval motor axons and accumulate in presynaptic neuromuscular junction terminals When Hsap\HDQ128.Scer\UAS is driven by Scer\GAL4elav-C155, larvae show a significant reduction in locomotor speed of about 25% from 1.23 mm/s to 0.92 mm/s. In adults expression of Hsap\HDQ128.Scer\UAS by Scer\GAL4elav-C155 cause adult lethality. When driven by Scer\GAL4elav.PLu adults are fully viable, however, several days after eclosion, mutant adults begin to exhibit uncoordinated movement and abnormal grooming behaviour. These behaviours worsen with age, resulting in premature death. When Hsap\HDQ128.Scer\UAS is driven by Scer\GAL4elav-C155, Hsap\HD cytoplasmic aggregates are seen in neurons. When driven by Scer\GAL4αTub84B.PL cytoplasmic aggregates are seen in both neuronal and non-neuronal tissues. No nuclear aggregates are seen.

External Data
Interactions
Show genetic interaction network for Enhancers & Suppressors
Phenotypic Class
Enhanced by
NOT Enhanced by
Statement
Reference

Hsap\HTTQ128.UAS, Scer\GAL4repo.Switch.2301 has short lived | RU486 conditional phenotype, non-enhanceable by p535A-1-4/p535A-1-4

Hsap\HTTQ128.UAS, Scer\GAL4repo.Switch.2301 has short lived | RU486 conditional phenotype, non-enhanceable by foxoΔ94/foxoΔ94

Suppressed by
Statement
Reference
NOT suppressed by
Statement
Reference

Hsap\HTTQ128.UAS, Scer\GAL4repo.Switch.2301 has short lived | RU486 conditional phenotype, non-suppressible by foxoΔ94/foxoΔ94

Hsap\HTTQ128.UAS, Scer\GAL4repo.Switch.2301 has short lived | RU486 conditional phenotype, non-suppressible by p535A-1-4/p535A-1-4

Hsap\HTTQ128.UAS, Scer\GAL4GMR.PU has visible | adult stage phenotype, non-suppressible by GIIIspla2EP1516/GIIIspla2[+]

Phenotype Manifest In
Enhanced by
Statement
Reference

Hsap\HTTQ128.UAS, Scer\GAL4GMR.PU has eye phenotype, enhanceable by rho-5[+]/rho-5KO1

Hsap\HTTQ128.UAS, Scer\GAL4GMR.PU has ommatidium phenotype, enhanceable by rho-5[+]/rho-5KO1

NOT Enhanced by
Statement
Reference
Suppressed by
NOT suppressed by
Additional Comments
Genetic Interactions
Statement
Reference
Xenogenetic Interactions
Statement
Reference

Co-expression of rho-5Scer\UAS.cZa or Hsap\RHBDF1Scer\UAS.cLa partially suppresses the rough eye phenotype and reduced numbers of ommatidia seen in flies with Hsap\HTTQ128.Scer\UAS driven by Scer\GAL4GMR.PU.

rho-5KO1/+ enhances the rough eye phenotype and reduced numbers of ommatidia seen in flies with Hsap\HTTQ128.Scer\UAS driven by Scer\GAL4GMR.PU.

One copy of GIIIspla2EP1516 does not suppress the rough eye phenotype seen when Hsap\HTTQ128.Scer\UAS is expressed under the control of Scer\GAL4GMR.PU.

Co-expression of slmbScer\UAS.cGa decreases the loss of eye pigmentation and improves ommatidial morphology in flies expressing Hsap\HTTQ128.Scer\UAS under the control of Scer\GAL4GMR.PU.

Complementation and Rescue Data
Comments
Images (0)
Mutant
Wild-type
Stocks (0)
Notes on Origin
Discoverer
External Crossreferences and Linkouts ( 0 )
Synonyms and Secondary IDs (4)
Reported As
Symbol Synonym
Hsap\HDQ128.Scer\UAS
Hsap\HTTQ128.Scer\UAS
Hsap\HTTQ128.UAS
Name Synonyms
Secondary FlyBase IDs
    References (25)