raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:85279

KDM5C-related syndromic X-linked intellectual disability

Synonyms: Claes-Jensen syndrome

Type
Malformation syndrome
Group
Disorder
Inheritance
X-linked recessive
Age of onset
Childhood
Status
active

A rare multiple congenital anomalies/dysmorphic syndrome characterized by mild to severe intellectual deficit associated with variable clinical manifestations including spasticity, cryptorchidism, maxillary hypoplasia, alopecia areata, epilepsy, short stature, impaired speech, and behavioral problems.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enKDM5C-related syndromic X-linked intellectual disabilityClaes-Jensen syndrome
frDéficience intellectuelle liée à l'X syndromique associée à KDM5CSyndrome de Claes-Jensen
deIntelligenzminderung, X-chromosomale, syndromale, KDM5C-assoziierteClaes-Jensen-Syndrom
esDiscapacidad intelectual sindrómica ligada al cromosoma X asociada a KDM5CSíndrome de Claes-Jensen
itDisabilità intellettiva sindromica legata all'X correlata a KDM5CSindrome di Claes-Jensen
nlKDM5C-gerelateerde syndromale X-gebonden intellectuele achterstandSyndroom van Claes-Jensen
ptPerturbação do desenvolvimento intelectual sindromática ligada ao X KDM5C-relacionada
plSyndromiczna niepełnosprawność intelektualna sprzężona z chromosomem X z powodu mutacji JARID1CSyndromiczna niepełnosprawność intelektualna sprzężona z chromosomem X związana z mutacjami z genie KDM5C
csSyndromická X-vázaná mentální retardace související s KDM5CSyndromická mentální retardace způsobená mutací JARID1C
ukСиндромна Х-зчеплена інтелектуальна недостатність, повязана з KDM5C
zhJARID1C突变所致综合征性X连锁智力残疾
trJARID1C mutasyonuna bağlı sendromik X'e bağlı zihinsel yetersizlik

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM300534Evalidated
ICD-10Q87.8NTBTattributedvalidated
ICD-11LD90NTBTattributedvalidated
MONDO0010355Evalidated
UMLSC5681493Evalidated

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
KDM5CDisease-causing germline mutation(s) inAssessedHGNC:11114ENSG00000126012314690Xp11.22lysine demethylase 5C15586325[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families10 familiesWorldwideFamily(ies)ValidatedORPHANET
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidatedORPHANET

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

25 annotations · validated 2016-06-01
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0000028Cryptorchidism
HP:0000750Delayed speech and language development
HP:0000327Hypoplasia of the maxilla
HP:0010864Intellectual disability, severe
HP:0002232Patchy alopecia
Frequent (79-30%)
HP:0000718Aggressive behavior
HP:0001347Hyperreflexia
HP:0001250Seizure
HP:0004322Short stature
HP:0001257Spasticity
Occasional (29-5%)
HP:0000717Autism
HP:0100490Camptodactyly of finger
HP:0030084Clinodactyly
HP:0008734Decreased testicular size
HP:0000490Deeply set eye
HP:0000218High palate
HP:0000256Macrocephaly
HP:0000252Microcephaly
HP:0007565Multiple cafe-au-lait spots
HP:0000426Prominent nasal bridge
HP:0000411Protruding ear
HP:0004279Short palm
HP:0000486Strabismus
HP:0001762Talipes equinovarus
HP:0001182Tapered finger

Run the differential on the 5 obligate / very frequent terms

Annotation source: 21575681[PMID]_19826449[PMID]

7

Sources for this card