raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:168454

NANS-CDG

Synonyms: SEMD, Geneviève type · SEMDG · N-acetylneuraminic acid-9-phosphate synthase deficiency · Spondyloepimetaphyseal dysplasia Camera-Genevieve type · Spondyloepimetaphyseal dysplasia, Geneviève type

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

Spondyloepimetaphyseal dysplasia, Geneviève type is a rare primary bone dysplasia characterized by severe developmental delay and skeletal dysplasia (including short stature, premature carpal ossification, platyspondyly, longitudinal metaphyseal striations, and small epiphyses), as well as moderate to severe intellectual disability and facial dysmorphism, including prominent forehead, mild synophrys, depressed nasal bridge, prominent bulbous nasal tip and full lips.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enNANS-CDGSEMD, Geneviève type · SEMDG · N-acetylneuraminic acid-9-phosphate synthase deficiency · Spondyloepimetaphyseal dysplasia Camera-Genevieve type · Spondyloepimetaphyseal dysplasia, Geneviève type
frNANS-CDGSEMD type Geneviève · SEMDG · Déficit en N-acétylneuraminique acide-9-phosphate synthase · Dysplasie spondylo-épimétaphysaire type Camera-Genevieve · Dysplasie spondylo-épimétaphysaire type Geneviève
deNANS-CDGSEMD Typ Geneviève · SEMDG · Kongenitale Glykosylierungsstörung durch N-Acetylneuraminsäure-9-phosphat-Synthase-Mangel · Dysplasie, spondyloepimetaphysäre, Typ Geneviève
esNANS-CDGDeficiencia de ácido N-acetilneuramínico-9-fosfato sintasa · Displasia espondiloepimetafisaria tipo Camera-Genevieve · Displasia espondiloepimetafisaria tipo Geneviève · SEMD, tipo Geneviève · SEMDG
itNANS-CDGDisplasia spondiloepimetafisaria tipo Camera-Genevieve · Deficit di acido N-acetilneuraminico-9-fosfato sintasi · Displasia spondiloepimetafisaria, tipo Genevieve · SEMDG · SEMD, tipo Geneviève
nlNANS-CDGDeficiëntie van N-acetylneuraminezuur-9-fosfaat-synthase · Spondylo-epimetafysaire dysplasie, Camera-Geneviève-type · Spondylo-epimetafysaire dysplasie, Geneviève-type · SEMD, Geneviève-type · SEMDG
ptDisplasia espondiloepimetafisária, tipo Genevieve
plDysplazja kręgowo-nasadowo-przynasadowa, typ Geneviève= en
csSpondyloepimetafyzární dysplázie, Genevieveho typ= en
ukСпондилоепіметафізарна дисплазія, тип ЖеневєваSEMD, тип Женевєва · SEMDG
zhGeneviÞve 型脊柱干骺端发育不良Geneviève型SEMD
trSpondiloepimetafizyaldisplazi, GeneviÞve tipiSEMDG · SEMD, Geneviève tipi

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM610442Evalidated
ICD-10Q77.7NTBTattributedvalidated
ICD-11LD24.3NTBTindexvalidated
MONDO0012495Evalidated
MeSHC535785Evalidated
UMLSC1864872Evalidated
GARD10057Evalidated

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 (1):

No children.

4

Genes

1 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
NANSDisease-causing germline mutation(s) (loss of function) inAssessedHGNC:19237ENSG000000953806052029q22.33N-acetylneuraminate synthase27213289[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families6 familiesWorldwideFamily(ies)Validated27213289[PMID]
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidatedORPHANET_27213289[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

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

7

Sources for this card