raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:209967

Episodic ataxia type 6

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

Episodic ataxia type 6 (EA6) is an exceedingly rare form of Hereditary episodic ataxia with varying degrees of ataxia and associated findings including slurred speech, headache, confusion and hemiplegia.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enEpisodic ataxia type 6
frAtaxie épisodique type 6
deAtaxie, episodische, Typ 6
esAtaxia episódica tipo 6
itAtassia episodica, tipo 6
nlEpisodische ataxie type 6
ptAtaxia episódica tipo 6
plAtaksja epizodyczna typu 6
csEpizodická ataxie, typ 6
ukЕпізодична атаксія, тип 6
zh发作性共济失调6型
trEpizodik ataksi tip 6

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM612656Evalidated
ICD-10G11.8NTBTattributedvalidated
ICD-118A03.14NTBTindexvalidated
MONDO0012982Evalidated
MeSHC567207Evalidated
UMLSC2675211Evalidated

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 (1):

No children.

4

Genes

1 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
SLC1A3Disease-causing germline mutation(s) inAssessedHGNC:10941ENSG000000792156001115p13.2solute carrier family 1 member 319139306[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidatedORPHANET
Cases/families4 casesWorldwideCase(s)ValidatedORPHANET_19139306[PMID]_16116111[PMID]_23107647[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 2018-04-09
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0001251Ataxia
HP:0002017Nausea and vomiting
HP:0000613Photophobia
HP:0002321Vertigo
Frequent (79-30%)
HP:0002183Phonophobia
Occasional (29-5%)
HP:0001272Cerebellar atrophy
HP:0000651Diplopia
HP:0000640Gaze-evoked nystagmus
HP:0002315Headache
HP:0002301Hemiplegia
HP:0002076Migraine
HP:0007663Reduced visual acuity
HP:0001250Seizure
HP:0001350Slurred speech

Run the differential on the 4 obligate / very frequent terms

Annotation source: 19139306[PMID]_16116111[PMID]

7

Sources for this card