raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:85323

X-linked intellectual disability, Seemanova type

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

X-linked intellectual disability, Seemanova type is characterised by microcephaly, intellectual deficit, growth retardation and hypogenitalism. It has been described in four boys from one family. A characteristic facies and ophthalmologic anomalies were also present and included microphthalmia, microcornea and cataract. Transmission is X-linked.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enX-linked intellectual disability, Seemanova type
frDéficience intellectuelle liée à l'X type Seemanova
deIntelligenzminderung, X-chromosomale, Typ Seemanova
esDiscapacidad intelectual ligada al cromosoma X tipo Seemanova
itDisabilità intellettiva legata all'X, tipo Seemanova
nlX-gebonden intellectuele achterstand, Seemanova-type
ptPerturbação do desenvolvimento intelectual ligada ao X, tipo Seemanova
plNiepełnosprawność intelektualna typu Seemanova sprzężona z chromosomem X
csX-vázaná mentální retardace, Seemanové typ
ukХ-зчеплена розумова відсталість, тип Сіманова
zhX连锁智力障碍,Seemanova型
trX'e bağlı zihinsel yetersizlik, Seemanova tipi

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
ICD-10Q87.8NTBTattributedvalidated
ICD-11LD20.2NTBTindexvalidated
MONDO0019421Evalidated
UMLSC4305088Evalidated

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 (2):

No children.

4

Genes

0 direct

Orphanet records no gene directly on this code.

5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families4 casesWorldwideCase(s)Validated8958326[PMID]
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidatedORPHANET_8958326[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

16 annotations · validated 2019-08-09
HPOTerm (as annotated by Orphanet)Diagnostic
Frequent (79-30%)
HP:0000028Cryptorchidism
HP:0000519Developmental cataract
HP:0000286Epicanthus
HP:0000316Hypertelorism
HP:0000135Hypogonadism
HP:0009004Hypoplasia of the musculature
HP:0001249Intellectual disability
HP:0000400Macrotia
HP:0000252Microcephaly
HP:0002191Progressive spasticity
HP:0000278Retrognathia
HP:0001250Seizure
HP:0003202Skeletal muscle atrophy
HP:0001518Small for gestational age
Occasional (29-5%)
HP:0001627Abnormal heart morphology
HP:0000218High palate

Annotation source: 8958326[PMID]

7

Sources for this card