FB2026_01 , released March 12, 2026
FB2026_01 , released March 12, 2026
Gene: Hsap\HTT
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General Information
Symbol
Hsap\HTT
Species
H. sapiens
Name
huntingtin
Annotation Symbol
Feature Type
FlyBase ID
FBgn0025587
Gene Model Status
Stock Availability
Gene Summary
Contribute a Gene Snapshot for this gene.
Also Known As

Htt, HD, hHTT, mHTT, HTTex1

Key Links
Foreign Gene Data

Foreign sequence; species == Homo sapiens; gene == HTT; HGNC:4851.

Summaries
Alleles, Insertions, Transgenic Constructs
Classical and Insertion Alleles ( 0 )
For All Classical and Insertion Alleles Show
 
Other relevant insertions
Transgenic Constructs ( 168 )
For All Alleles Carried on Transgenic Constructs Show
Transgenic constructs containing/affecting coding region of Hsap\HTT
Transgenic constructs containing regulatory region of Hsap\HTT
Variants
Variant Molecular Consequences
Alleles Representing Disease-Implicated Variants
Phenotypes
For more details about a specific phenotype click on the relevant allele symbol.
Lethality
Allele
Other Phenotypes
Allele
Phenotype manifest in
Allele
Orthologs
Model Organism Orthologs (via DIOPT v9.1)
Species\Gene Symbol
Score
Best Score
Best Reverse Score
Alignment
Complementation?
Transgene?
Drosophila melanogaster (Fruit fly) (1)
11 of 14
Yes
Yes
 
0  
Human Disease Associations
FlyBase Human Disease Model Reports
Disease Ontology (DO) Annotations
Models Based on Experimental Evidence ( 84 )
Allele
Disease
Evidence
References
Potential Models Based on Orthology ( 0 )
Human Ortholog
Disease
Evidence
References
Modifiers Based on Experimental Evidence ( 45 )
Allele
Disease
Interaction
References
is exacerbated by Itpr90B.0
is ameliorated by MCU1
is ameliorated by AxnUAS.cUa
is ameliorated by Wnt2I
is ameliorated by Wnt2RJ
is ameliorated by pan3
is ameliorated by arm3
is ameliorated by armG0192
is ameliorated by pan2
is ameliorated by wg1
is ameliorated by wgSp-1
is ameliorated by Wnt2O
is ameliorated by Apc2UAS.cUa
is exacerbated by sggUAS.cBa
is exacerbated by sggS9A.UAS
is ameliorated by G6pdUAS.cLa
is ameliorated by PfkUAS.cTa
is ameliorated by jpUAS
is exacerbated by jpKK107921
is ameliorated by Sirt117
is exacerbated by Sirt117
is ameliorated by htt81aa.UAS
is ameliorated by cd1
is ameliorated by cn3
is ameliorated by vKK108195
is ameliorated by v36f
is exacerbated by htt98E2
is ameliorated by BmcpUAS.cBa
is exacerbated by ATP7GD3322
is ameliorated by PsaUAS.cSa
is exacerbated by v36f
is NOT ameliorated by Gcn5UAS.cBa
is exacerbated by Gcn5E333st
is exacerbated by nej3
is NOT exacerbated by mof2
is NOT exacerbated by enok2
is exacerbated by Glut117J
is exacerbated by Drp1UAS.cDa
is ameliorated by Sin3A08269
is ameliorated by trr3
is exacerbated by E(z)63
is exacerbated by E(z)731
is ameliorated by trx1
is ameliorated by Jarid2MB00996
is ameliorated by Kdm4AKG04636
is ameliorated by Set2RNAi.UAS
is ameliorated by Utx1
is ameliorated by Utx2
is exacerbated by ash122
is exacerbated by esc5
is exacerbated by gppXXV
is exacerbated by gppX
is ameliorated by trr1
is ameliorated by Kdm2DG12810
is ameliorated by NilHMC06011
is ameliorated by Gs1G3347
is ameliorated by Adgf-AHMC06334
is ameliorated by Adgf-DHMC04420
is ameliorated by Adk2HMC05509
is ameliorated by Adk2UAS.cPa
is ameliorated by AdoRJF02687
is exacerbated by AdoRUAS.cPa
is ameliorated by Ent1HMJ21190
is ameliorated by Ent2KK104419
is exacerbated by Ent2UAS.cLa
is ameliorated by Cul1GL00561
is ameliorated by MESR4EP386
is exacerbated by TlEP1051
is ameliorated by svrEP356
is exacerbated by SNF4AγEP3015b
is ameliorated by gEP514
is exacerbated by SNF4AγKG10152
is ameliorated by mubEP3108
is ameliorated by slmbUAS.cGa
is exacerbated by rho-5KO1
is ameliorated by rho-5UAS.cZa
is ameliorated by Atx2KK100423
is ameliorated by CrebAJF02189
is ameliorated by Fmr1GL00075
is ameliorated by Fmr1HMS00248
is ameliorated by Atx2HMS02726
is ameliorated by Atx2HMS01392
is ameliorated by ItprJF01957
is ameliorated by PtenUAS.cUa
is ameliorated by PykGL00099
is ameliorated by foxoUAS.cUa
is ameliorated by ktoHMS01062
is ameliorated by nejGD8975
is ameliorated by nejHMS01507
is ameliorated by nejKK113191
is ameliorated by panΔN.UAS
is ameliorated by foxoTM.UAS
is ameliorated by srlEY05931
is ameliorated by ClkJrk
is ameliorated by Stip1HMS00779
is ameliorated by Stip1HMS00965
is ameliorated by arm3
is ameliorated by Khc8
is exacerbated by Pgi2
is ameliorated by pnutXP
is exacerbated by shot3
is exacerbated by PginNC1
is exacerbated by fafBX4
is ameliorated by Mef2X1
is ameliorated by Chc1
is ameliorated by arm2
is ameliorated by DnaJ-1EP411
is exacerbated by eff8
is exacerbated by skdL7062
is exacerbated by taraEP3463
is exacerbated by cpoEP3378
is ameliorated by pumbem
is ameliorated by sovKG00226
is exacerbated by Sin3AdQ4
is exacerbated by Sirt1EP2300
is exacerbated by pumEP3461
is ameliorated by 14-3-3εex4
is exacerbated by Diap14
is exacerbated by Akt04226
is exacerbated by mubEP3623
is exacerbated by vibEP651
is exacerbated by vibEP513
is exacerbated by sovEP1438
is ameliorated by solGD8164
is ameliorated by SppLGD284
is ameliorated by SppRNAi.UAS
is ameliorated by Mmp2BG00958
is ameliorated by SppLEY06831
is ameliorated by golGD3528
is ameliorated by Mmp202353
is exacerbated by solEY02771
is ameliorated by PIP4K29
is ameliorated by RopG27
is ameliorated by RopG4478
is ameliorated by cacHC129
is ameliorated by dac9
is ameliorated by Rok1
is ameliorated by shi1
is ameliorated by sloGD244
is ameliorated by AblUAS.cFa
is ameliorated by AnxB10d03410
is ameliorated by CG8916GD3383
is ameliorated by CenG1AMI06024
is exacerbated by JraNIG.2275R
is ameliorated by Nrx-1MI02579
is exacerbated by Pkc53EGD11984
is ameliorated by PvrGD75
is ameliorated by SytβKK112599
is ameliorated by cora14
is ameliorated by dpnGFP.FPTB
is exacerbated by maheGD17235
is ameliorated by sifNIG.5406R
is ameliorated by trnS064117
is exacerbated by tsrN121
is ameliorated by vlck01109
is ameliorated by zldGFP.FPTB
Disease Associations of Human Orthologs (via DIOPT v9.1 and OMIM)
Note that ortholog calls supported by only 1 or 2 algorithms (DIOPT score < 3) are not shown.
Homo sapiens (Human)
Gene name
Score
OMIM
OMIM Phenotype
DO term
Complementation?
Transgene?
Functional Complementation Data
Functional complementation data is computed by FlyBase using a combination of the orthology data obtained from DIOPT and OrthoDB and the allele-level genetic interaction data curated from the literature.
Dmel gene
Ortholog showing functional complementation
Supporting References
Interactions
Summary of Physical Interactions
Summary of Genetic Interactions
Interaction Browsers
Starting gene(s)
Interaction type
Interacting gene(s)
Reference
Starting gene(s)
Interaction type
Interacting gene(s)
Reference
External Data
Linkouts
Class of Gene
Stocks and Reagents
Other Comments

Expression of Hsap\YAP1 in vivo seems to play a protective role against the toxicity of mutant Hsap\HD in HD pathology.

A Drosophila model for Huntington's disease has been developed. The age of onset and severity of neuronal degeneration correlate with length of polyglutamine tract in the Hsap\HD protein, and nuclear accumulation of the Hsap\HD protein.

Relationship to Other Genes
Source for database merge of
Additional comments
Nomenclature History
Source for database identify of
Nomenclature comments
Etymology
Synonyms and Secondary IDs (22)
Reported As
Symbol Synonym
Hsap\HD
Htt
(Victor Atoki et al., 2025, Atienzar-Aroca et al., 2024, Barwell et al., 2023, Dhankhar et al., 2023, Sharma et al., 2023, Zsindely et al., 2023, Benoit et al., 2022, Hegde and Srivastava, 2022, Tello et al., 2022, Joy et al., 2021, Subhan and Siddique, 2021, Bolus et al., 2020, Bono-Yagüe et al., 2020, Denton et al., 2020, Joag et al., 2020, Varga et al., 2020, Bason et al., 2019, Raj and Sarkar, 2019, Rodriguez-Fernandez et al., 2019, Zhu et al., 2019, Arabit et al., 2018, Coelho et al., 2018, Song et al., 2018, Yeh et al., 2018, Zhang et al., 2018, Akbergenova and Littleton, 2017, Daldin et al., 2017, Gregory et al., 2017, Raj and Sarkar, 2017, Singh et al., 2017, Sowade and Jahn, 2017, Chongtham and Agrawal, 2016, Lewis and Smith, 2016, Weiss and Littleton, 2016, Babcock and Ganetzky, 2015, Besson et al., 2015, Heidari et al., 2015, Jimenez-Sanchez et al., 2015, Menzies et al., 2015, Poças et al., 2015, Takeuchi et al., 2015, Yao et al., 2015, Hsu et al., 2014, Sajjad et al., 2014, Singh et al., 2014, Smith et al., 2014, Fujita et al., 2013, Fujita et al., 2013, Sinadinos et al., 2013, Bodai et al., 2012, Shirasaki et al., 2012, Sontag et al., 2012, Weiss et al., 2012, Zhang et al., 2012, Campesan et al., 2011, Gohil et al., 2011, Kirilly et al., 2011, Maher et al., 2011, Richards et al., 2011, Schulte et al., 2011, Tsoi et al., 2011, Wu et al., 2011, Gonzales and Yin, 2010, Luthi-Carter et al., 2010, Nisoli et al., 2010, Rana et al., 2010, Winslow et al., 2010, Wu et al., 2010, Branco et al., 2008, Fujikake et al., 2008, Liévens et al., 2008, Mugat et al., 2008, Pallos et al., 2008, Ravikumar et al., 2008, Al-Ramahi et al., 2007, Mahoney et al., 2007, Ryoo et al., 2007, Al-Ramahi et al., 2006, Boeddrich et al., 2006, Hoshino et al., 2006, Rujano et al., 2006, Lievens et al., 2005, Warrick et al., 2005, Kazantsev et al., 2002, Kazemi-Esfarjani and Benzer, 2002, Steffan et al., 2001)
Secondary FlyBase IDs
    Datasets (0)
    Study focus (0)
    Experimental Role
    Project
    Project Type
    Title
    Study result (0)
    Result
    Result Type
    Title
    External Crossreferences and Linkouts ( 7 )
    Sequence Crossreferences
    NCBI Gene - Gene integrates information from a wide range of species. A record may include nomenclature, Reference Sequences (RefSeqs), maps, pathways, variations, phenotypes, and links to genome-, phenotype-, and locus-specific resources worldwide.
    Other crossreferences
    MARRVEL - MARRVEL (human gene)
    OMIM_GENE - Online Mendelian Inheritance in Man (Genes)
    OMIM_PHENOTYPE - Online Mendelian Inheritance in Man (Phenotypes)
    References (342)