raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:85278

Christianson syndrome

Synonyms: X-linked Angelman-like syndrome

Type
Malformation syndrome
Group
Disorder
Inheritance
X-linked recessive
Age of onset
Infancy, Neonatal
Status
active

A rare developmental defect during embryogenesis characterized by intellectual deficit, ataxia, postnatal microcephaly, and hyperkinesis.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enChristianson syndromeX-linked Angelman-like syndrome
frSyndrome de ChristiansonSyndrome Angelman-like lié à l'X
deChristianson-SyndromX-chromosomales Angelman-ähnliches Syndrom
esSíndrome de ChristiansonSíndrome similar a Angelman ligado al cromosoma X
itSindrome di ChristiansonDeficit cognitivo legato all'X - dismorfismi craniofacciali - epilessia - oftalmoplegia - atrofia cerebellare · Deficit cognitivo legato all'X, tipo sudafricano · Sindrome Angelman-simile legata all'X
nlSyndroom van ChristiansonX-gebonden Angelman-achtig syndroom
ptSíndrome ChristiansonSíndrome Angelman-like ligado ao X
plZespół ChristiansonaNiepełnosprawność intelektualna sprzężona z chromosomem X - dysmorfia czaszkowo-twarzowa - padaczka - oftalmoplegia - atrofia móżdżku · Niepełnosprawność intelektualna sprzężona z chromosomem X, typ południowo afrykański · Zespół podobny do zespołu Angelmana sprzężony z chromosomem X
csChristiansonův syndromX-vázaný syndrom podobný Angelmanovu syndromu · X-vázaná mentální retardace, jihoafrický typ · X-vázaný syndrom zahrnující mentální retardaci, kraniofaciální dysmorfismus, epilepsii, oftalmoplegii a atrofii mozečku
ukСиндром КрістіансонаХ-зчеплений синдром Ангельмана
zhChristianson综合征X-连锁Angelman样综合征
trChristianson sendromuX'e bağlı Angelman-benzeri sendrom

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM300243Evalidated
ICD-10Q87.8NTBTattributedvalidated
ICD-118A03.1YNTBTindexvalidated
MONDO0010278Evalidated
MeSHC567484Evalidated
UMLSC2678194Evalidated
GARD10572Evalidated

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 (6):

No children.

4

Genes

1 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
SLC9A6Disease-causing germline mutation(s) inAssessedHGNC:11079ENSG00000198689300231Xq26.3solute carrier family 9 member A618342287[PMID]
5

Prevalence and incidence

1 record
TypeClassValueAreaQualificationValidationSource
Point prevalence1-9 / 100 000—WorldwideClass onlyValidated25044251[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

49 annotations · validated 2024-08-06
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0001344Absent speech
HP:0004326Cachexia
HP:0002376Developmental regression
HP:0002197Generalized-onset seizure
HP:0002187Intellectual disability, profound
HP:0000276Long face
HP:0000400Macrotia
HP:0000275Narrow face
HP:0002529Neuronal loss in central nervous system
HP:0011344Severe global developmental delay
HP:0000486Strabismus
HP:0000574Thick eyebrow
HP:0002078Truncal ataxia
Frequent (79-30%)
HP:0000733Abnormal repetitive mannerisms
HP:0000765Abnormal thorax morphology
HP:0001181Adducted thumb
HP:0007370Aplasia/Hypoplasia of the corpus callosum
HP:0000717Autism
HP:0001272Cerebellar atrophy
HP:0002120Cerebral cortical atrophy
HP:0100024Conspicuously happy disposition
HP:0002019Constipation
HP:0002194Delayed gross motor development
HP:0002307Drooling
HP:0002015Dysphagia
HP:0002353EEG abnormality
HP:0001508Failure to thrive
HP:0011968Feeding difficulties
HP:0008872Feeding difficulties in infancy
HP:0002066Gait ataxia
HP:0002020Gastroesophageal reflux
HP:0002487Hyperkinetic movements
HP:0000748Inappropriate laughter
HP:0000252Microcephaly
HP:0002300Mutism
HP:0000639Nystagmus
HP:0000194Open mouth
HP:0000602Ophthalmoplegia
HP:0000767Pectus excavatum
HP:0005484Secondary microcephaly
HP:0001250Seizure
HP:0002119Ventriculomegaly
Occasional (29-5%)
HP:0003199Decreased muscle mass
HP:0000490Deeply set eye
HP:0200134Epileptic encephalopathy
HP:0001382Joint hypermobility
HP:0000939Osteoporosis
HP:0002650Scoliosis
HP:0002360Sleep abnormality

Run the differential on the 12 obligate / very frequent terms

Annotation source: 10528855[PMID]_29334451[PMID]

7

Sources for this card