raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:401901

Huntington disease-like syndrome due to C9ORF72 expansions

Synonyms: C9ORF72-related Huntington disease phenocopy · C9ORF72-related Huntington disease-like syndrome · Huntington disease phenocopy due to C9ORF72 expansions

Type
Disease
Group
Disorder
Inheritance
Autosomal dominant
Age of onset
Adult
Status
active

A rare, genetic neurodegenerative disease characterized by movement disorders, including dystonia, chorea, myoclonus, tremor and rigidity. Associated features are also cognitive and memory impairment, early psychiatric disturbances and behavioral problems.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enHuntington disease-like syndrome due to C9ORF72 expansionsC9ORF72-related Huntington disease phenocopy · C9ORF72-related Huntington disease-like syndrome · Huntington disease phenocopy due to C9ORF72 expansions
frMaladie de Huntington-like due à des expansions C9ORF72Phénocopie de Huntington due à des expansions C9ORF72
deChorea Huntington-ähnliches Syndrom durch C9ORF72-ExpansionenC9ORF72-abhängige Phänokopie der Huntington-Krankheit
esSíndrome similar a la enfermedad de Huntington por expansiones de C9ORF72Fenocopia de la enfermedad de Huntington asociada a C9ORF72 · Fenocopia de la enfermedad de Huntington asociada al gen C9ORF72 · Fenocopia de la enfermedad de Huntington por expansiones de C9ORF72 · Síndrome de enfermedad de Huntington-like por expansiones de C9ORF72 · Síndrome similar a la enfermedad de Huntington asociado a C9ORF72
itMalattia simil-Huntington da espansioni di C9ORF72Fenocopia della malattia di Huntington C9ORF72-correlata · Fenocopia della malattia di Huntington da espansioni di C9ORF72 · Sindrome malattia di Huntington-simile correlata a C9ORF72
nlZiekte van Huntington-achtig syndroom door C9ORF72-expansiesC9ORF72-gerelateerd ziekte van Huntington-achtig syndroom · C9ORF72-gerelateerde ziekte van Huntington fenocopie
ptSíndrome semelhante à doença de Huntington por expansões C9ORF72
plZespół podobny do choroby Huntingtona spowodowany ekspansją powtórzeń w genie C9ORF72Fenokopia choroby Huntingtona z powodu ekspansji C9ORF72 · Fenokopia choroby Huntingtona związana z C9ORF72 · Zespół podobny do choroby Huntingtona związany z C9ORF72
csHuntington disease-like syndrom způsobený expanzemi C9ORF72C9ORF72-vázaná huntingtonská fenokopie · C9ORF72-asociovaný Huntigton´s disease-like syndrom · Huntingtonská fenokopie způsobená expanzemi C9ORF72 · Syndrom podobný Huntingtonově chorobě, způsobený expanzemi C9ORF72 · Syndrom podobný Huntingtonově chorobě, asociovaný C9ORF72
ukГантінгтон-подібний синдром, зумовлений експансією C9ORF72C9ORF72-повязана фенокопія хвороби Хантінгтона · C9ORF72-повязаний синдром, подібний до хвороби Гантінгтона · Фенокопія хвороби Гантінгтона через експансії C9ORF72
zhC9ORF72扩增导致的亨廷顿病样综合征C9ORF72扩展所致亨廷顿病拟表型
trC9ORF72 genişlemelerine bağlı Huntington hastalığı-benzeri sendromC9ORF72-ilişkili Huntington hastalığı fenokopisi · C9ORF72-ilişkili Huntington hastalığı benzeri sendromu · C9ORF72 genişlemelerine bağlı Huntington hastalığı fenokopisi

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
ICD-10G10NTBTattributedvalidated
MONDO0018425Evalidated
UMLSC5190586Evalidated

E exact · NTBT this ORPHAcode is narrower than the target · BTNT broader than the target · ND not decided.

3

Classification

Preferential parent (Orphanet linearisation):

Parents in the classifications (3):

No children.

4

Genes

1 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
C9ORF72Disease-causing germline mutation(s) inAssessedHGNC:28337ENSG000001478946142609p21.2C9orf72-SMCR8 complex subunit24363131[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families10 casesWorldwideCase(s)Validated24363131[PMID]
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidatedORPHANET_24363131[PMID]

Value is Orphadata's ValMoy: the mean estimate per 100 000 for prevalence and incidence, the number of cases or families for case reports.

6

HPO phenotypes

14 annotations · validated 2018-10-24
HPOTerm (as annotated by Orphanet)Diagnostic
Frequent (79-30%)
HP:0001251Ataxia
HP:0002072Chorea
HP:0100543Cognitive impairment
HP:0000719Inappropriate behavior
HP:0002354Memory impairment
HP:0002063Rigidity
Occasional (29-5%)
HP:0000739Anxiety
HP:0000716Depression
HP:0001332Dystonia
HP:0001300Parkinsonism
HP:0000709Psychosis
HP:0001337Tremor
HP:0002493Upper motor neuron dysfunction
Very rare (<4-1%)
HP:0001336Myoclonus

Annotation source: 25248608[PMID]_23934648[PMID]

7

Sources for this card