raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:420561

Temple-Baraitser syndrome

Synonyms: Severe intellectual disability-aplasia/hypoplasia of thumb and hallux syndrome · TMBTS

Type
Disease
Group
Disorder
Inheritance
Autosomal dominant
Age of onset
Infancy, Neonatal
Status
active

A rare, genetic, multiple congenital anomalies syndrome defined by global developmental delay and severe intellectual disability, epilepsy, hypoplasia/aplasia of the nails of the thumb and great toe, and facial dysmorphism.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enTemple-Baraitser syndromeSevere intellectual disability-aplasia/hypoplasia of thumb and hallux syndrome · TMBTS
frSyndrome de Temple-BaraitserSyndrome de déficit intellectuel sévère-aplasie/hypoplasie du pouce et de l'hallux · TMBTS
deTemple-Baraitser-SyndromSchwere Intelligenzminderung-Aplasia/Hypoplasie des Daumens und Hallux-Syndrom · TMBTS
esSíndrome de Temple-BaraitserSíndrome de discapacidad intelectual grave-aplasia/hipoplasia del pulgar y el hallux · TMBTS
itSindrome di Temple-BaraitserSindrome disabilità cognitiva grave-aplasia/ipoplasia del pollice e dell'alluce
nlSyndroom van Temple-BaraitserErnstige intellectuele achterstand - aplasie/hypoplasie van duim en hallux-syndroom · TMBTS
ptSíndrome Temple-Baraitser
plZespół Temple i BaraitseraTMBTS · Zespół ciężkiej niepełnosprawności intelektualnej i aplazji/hipoplazji kciuka i palucha
csTemplové-Baraitserův syndromSyndrom zahrnující těžkou mentální retardaci a aplázii/hypoplázii palců horních a dolních končetin · Temple-Baraitserův syndrom
ukСиндром Темпла-БарайзераТяжка розумова відсталість - аплазія/гіпоплазія великого пальця та синдром клишоногості · TMBTS
zhTemple-Baraitser综合征严重智力障碍-拇指和拇趾指综合​​症的轻度发育不良
trTemple-Baraitser sendromuTMBTS · Ağır zihinsel yetersizlik-aplazi/başparmak hipoplazisi ve halluks sendromu

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM611816Evalidated
ICD-10Q87.2NTBTattributedvalidated
MONDO0012735Evalidated
MeSHC567516Evalidated
UMLSC2678486Evalidated
GARD9441Evalidated

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
KCNH1Disease-causing germline mutation(s) (gain of function) inAssessedHGNC:6250ENSG000001434736033051q32.2potassium voltage-gated channel subfamily H member 125420144[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families9 casesWorldwideCase(s)Validated27282200[PMID]
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidatedORPHANET_27282200[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

48 annotations · validated 2019-12-03
HPOTerm (as annotated by Orphanet)Diagnostic
Frequent (79-30%)
HP:0012443Abnormality of brain morphology
HP:0001344Absent speech
HP:0010624Aplastic/hypoplastic toenail
HP:0001488Bilateral ptosis
HP:0011304Broad thumb
HP:0000280Coarse facial features
HP:0002019Constipation
HP:0000684Delayed eruption of teeth
HP:0005280Depressed nasal bridge
HP:0002353EEG abnormality
HP:0000286Epicanthus
HP:0001290Generalized hypotonia
HP:0000316Hypertelorism
HP:0010864Intellectual disability, severe
HP:0000527Long eyelashes
HP:0001847Long hallux
HP:0000343Long philtrum
HP:0000400Macrotia
HP:0000252Microcephaly
HP:0002058Myopathic facies
HP:0001250Seizure
HP:0011344Severe global developmental delay
HP:0004322Short stature
HP:0000574Thick eyebrow
HP:0012471Thick vermilion border
HP:0000154Wide mouth
HP:0000431Wide nasal bridge
HP:0000445Wide nose
Occasional (29-5%)
HP:0012555Absent nail of hallux
HP:0001802Absent toenail
HP:0000463Anteverted nares
HP:0006016Delayed phalangeal epiphyseal ossification
HP:0000232Everted lower lip vermilion
HP:0010803Everted upper lip vermilion
HP:0000293Full cheeks
HP:0000212Gingival overgrowth
HP:0009890High anterior hairline
HP:0000218High palate
HP:0001804Hypoplastic fingernail
HP:0012553Hypoplastic thumbnail
HP:0000294Low anterior hairline
HP:0000272Malar flattening
HP:0000194Open mouth
HP:0009882Short distal phalanx of finger
HP:0009660Short phalanx of the thumb
HP:0010804Tented upper lip vermilion
HP:0009928Thick nasal alae
HP:0009648Triangular shaped distal phalanx of the thumb

Annotation source: 26818738[PMID]_25629734[PMID]_25420144[PMID]

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Sources for this card