raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:642099

Spondyloepimetaphyseal dysplasia with joint laxity, Beighton type

Synonyms: SEMD-JL1 · SEMDJL1 · Spondyloepimetaphyseal dysplasia with joint laxity type 1

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

A rare primary bone dysplasia with multiple joint dislocations characterized by stunted stature, articular hypermobility and spinal malalignment resulting in severe progressive kyphosis. Joint dislocations include bilateral dislocation of the radial heads with elbow contractures, feet (bilateral talipes equinovarus) and congenital dislocations of the hip and genu valgus. Joint laxity is particularly observed in fingers. Spinal changes include moderate platyspondyly with anterior projection of the vertebral bodies. Facial features of oval face with a flattened nasal bridge, button nose, long upper lip, prominent eyes and blue sclera are characteristic but variable. Patients may also present mild skin extensibility, spatulate terminal phalanges, lip and palate clefts, micrognathia and structural cardiac malformations.

1

Names in Orphadata languages

10 of 12 languages
LangNameSynonyms
enSpondyloepimetaphyseal dysplasia with joint laxity, Beighton typeSEMD-JL1 · SEMDJL1 · Spondyloepimetaphyseal dysplasia with joint laxity type 1
frDysplasie spondylo-épimétaphysaire avec hyperlaxité ligamentaire type BeightonDysplasie spondylo-épimétaphysaire avec hyperlaxité ligamentaire type 1 · SEMD-JL1 · SEMDJL1
deDysplasie, spondyloepimetaphysäre, mit Überstreckbarkeit der Gelenke, Typ BeightonDysplasie, spondyloepimetaphysäre, mit Überstreckbarkeit der Gelenke, Typ 1 · SEMD-JL1 · SEMDJL1
esDisplasia espondiloepimetafisaria con laxitud articular tipo BeightonSEMD-JL1 · SEMDJL1 · Displasia espondiloepimetafisaria con laxitud articular tipo 1
itDisplasia spondiloepimetafisaria con lassità articolare tipo BeightonDisplasia spondiloepimetafisaria con lassità articolare tipo 1 · SEMD-JL1 · SEMDJL1
nlSpondylo-epimetafysaire dysplasie met gewrichtslaxiteit, Beighton-typeSEMD-JL1 · SEMDJL1 · Spondylo-epimetafysaire dysplasie met gewrichtslaxiteit type 1
ptDisplasia espondiloepimetafisária com hipermobilidade articular, tipo BeightonDisplasia espondiloepimetafisária com hipermobilidade articular tipo 1 · SEMD-JL1 · SEMDJL1
plDysplazja kręgowo-nasadowo-przynasadowa z wiotkością stawów typu Beightona= en
csSpondyloepimetafyzární dysplázie s kloubní laxicitou, Beightonův typ= en
ukСпондилоепіметафізарна дисплазія зі слабкістю суглобів, тип БейтонаSEMDJL1 · SEMD-JL1 · Спондилоепіметафізарна дисплазія з розхитаністю суглобів типу 1

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM271640Evalidated
ICD-10Q77.7NTBTattributedvalidated
ICD-11LD24.3NTBTattributedvalidated
MONDO0010075Evalidated
UMLSC4017377Evalidated

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.

Codes that Orphanet moved or referred to this one:

4

Genes

1 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
B3GALT6Disease-causing germline mutation(s) inAssessedHGNC:17978ENSG000001760226152911p36.33beta-1,3-galactosyltransferase 636779427[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families30 casesWorldwideCase(s)Validated27245527[PMID]
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidated27245527[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