raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:642085

EXOC6B-related spondyloepimetaphyseal dysplasia with joint laxity

Synonyms: EXOC6B-SEMD-JL · SEMD-JL3 · SEMDJL3 · Spondyloepimetaphyseal dysplasia with joint laxity type 3

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

A rare primary bone dysplasia characterized by multiple joint dislocations, in particular in hips and knees present at birth, but the elbows, wrists, ankles, and patellae can also be affected; severe joint laxity, scoliosis, slender fingers with distal tapering, and growth deficiency developing in the post-natal period resulting in short stature. Gracile metacarpals and metatarsals, delayed bone age with poorly ossified carpal and tarsal bones, metaphyseal and epiphyseal dysplasia, slender ribs, and spondylar dysplasia are radiographical signs. Intelligence is usually normal.

1

Names in Orphadata languages

10 of 12 languages
LangNameSynonyms
enEXOC6B-related spondyloepimetaphyseal dysplasia with joint laxityEXOC6B-SEMD-JL · SEMD-JL3 · SEMDJL3 · Spondyloepimetaphyseal dysplasia with joint laxity type 3
frDysplasie spondylo-épimétaphysaire avec hyperlaxité ligamentaire associée à EXOC6BDysplasie spondylo-épimétaphysaire avec hyperlaxité ligamentaire type 3
deEXOC6B-assoziierte spondyloepimetaphysäre Dysplasie mit GelenkhypermobilitätDysplasie, spondyloepimetaphysäre, mit Überstreckbarkeit der Gelenke, Typ 3 · EXOC6B-SEMD-JL · SEMD-JL3 · SEMDJL3
esDisplasia espondiloepimetafisaria con laxitud articular asociada a EXOC6BDisplasia espondiloepimetafisaria con laxitud articular tipo 3 · EXOC6B-SEMD-JL · SEMD-JL3 · SEMDJL3
itDisplasia spondiloepimetafisaria con lassità articolare correlata a EXOC6BDisplasia spondiloepimetafisaria con lassità articolare tipo 3 · EXOC6B-SEMD-JL · SEMD-JL3 · SEMDJL3
nlEXOC6B-gerelateerde spondylo-epimetafysaire dysplasie met gewrichtslaxiteitEXOC6B-SEMD-JL · SEMD-JL3 · SEMDJL3 · Spondylo-epimetafysaire dysplasie met gewrichtslaxiteit type 3
ptDisplasia espondiloepimetafisária com hipermobilidade articular EXOC6B-relacionadaDisplasia espondiloepimetafisária com hipermobilidade articular tipo 3 · EXOC6B-SEMD-JL · SEMD-JL3 · SEMDJL3
plDysplazja kręgowo-nasadowo-przynasadowa z wiotkością stawów związana z EXOC6B= en
csSpondyloepimetafyzární dysplázie s kloubní laxicitou, typ EXOC6B= en
ukEXOC6B-асоційована спондилоепіметафізарна дисплазія зі слабкістю суглобівEXOC6B-SEMD-JL · SEMDJL3 · SEMD-JL3 · Спондилоепіметафізарна дисплазія з розхитаністю суглобів типу 3

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM618395Evalidated
ICD-10Q77.7NTBTattributedvalidated
ICD-11LD24.3NTBTattributedvalidated
MONDO0032724Evalidated
UMLSC5193073Evalidated

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

1 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
EXOC6BDisease-causing germline mutation(s) inAssessedHGNC:17085ENSG000001440366078802p13.2exocyst complex component 6B36779427[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families6 casesWorldwideCase(s)Validated36150098[PMID]
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidated36150098[PMID]_ORPHANET

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

Orphanet has no HPO annotation for this code in this release.

7

Sources for this card