raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:464366

NEK9-related lethal skeletal dysplasia

Synonyms: Lethal skeletal dysplasia-fetal akinesia-contractures-thoracic dysplasia-pulmonary hypoplasia syndrome

Type
Malformation syndrome
Group
Disorder
Inheritance
Autosomal recessive
Age of onset
Antenatal
Status
active

NEK9-related lethal skeletal dysplasia is a rare, lethal, primary bone dysplasia characterized by fetal akinesia, multiple contractures, shortening of all long bones, short, broad ribs, narrow chest and thorax, pulmonary hypoplasia and a protruding abdomen. Short bowed femurs may also be associated.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enNEK9-related lethal skeletal dysplasiaLethal skeletal dysplasia-fetal akinesia-contractures-thoracic dysplasia-pulmonary hypoplasia syndrome
frDysplasie squelettique létale associée à NEK9Dysplasie squelettique létale avec akinésie foetale, contractures, dysplasie thoracique et hypoplasie pulmonaire
deNEK9-assoziierte letale SkelettdysplasieLetale Skelettdysplasie-fetale Akinesie-Kontrakturen-Thoraxdysplasie-Pulmonalhypoplasie-Syndrom
esDisplasia esquelética letal asociada a NEK9Síndrome letal de displasia esquelética-aquinesia fetal-contracturas-displasia torácica-hipoplasia pulmonar
itDisplasia scheletrica letale correlata a NEK9
nlNEK9-gerelateerde letale skeletdysplasieLetale skeletdysplasie - foetale akinesie - contracturen - thoracale dysplasie - pulmonaire hypoplasie-syndroom
ptDisplasia esquelética letal NEK9-relacionada
plLetalna dysplazja szkieletowa zależna od NEK9Zespół letalnej dysplazji szkieletowej, akinezji płodu, przykurczy, dysplazji klatki piersiowej i hipoplazji płuc
csNEK9-vázaná letální skeletální dysplázieLethal skeletal dysplasia-fetal akinesia-contractures-thoracic dysplasia-pulmonary hypoplasia syndrome · Syndrom zahrnující letální skeletální dysplázii, fetální akinezi, kontrakce, hrudní dysplázii a plicní hypoplázii
ukЛетальна скелетна дисплазія, повязана з NEK9Летальний синдром скелетної дисплазії - акінезії плода - контрактур - дисплазії грудної клітки - легеневої гіпоплазії
zhNEK9相关致死性骨发育不良致命性骨骼发育不良-胎儿运动障碍-挛缩-胸廓发育不良-肺发育不全综合征
trNEK9-ilişkili letal iskelet displazisiLetal iskelet displazisi-fetal akinezi-kontraktürler-torasik displazi-pulmoner hipoplazi sendromu

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM617022Evalidated
ICD-10Q68.8NTBTattributedvalidated
ICD-11LD26.4YNTBTattributedvalidated
MONDO0014870Evalidated
UMLSC5568141Evalidated

E exact · NTBT this ORPHAcode is narrower than the target · BTNT broader than the target · ND not decided.

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Classification

Preferential parent (Orphanet linearisation):

Parents in the classifications (3):

No children.

4

Genes

1 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
NEK9Disease-causing germline mutation(s) (loss of function) inAssessedHGNC:18591ENSG0000011963860979814q24.3NIMA related kinase 926908619[PMID]
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Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families5 casesWorldwideCase(s)Validated26908619[PMID]
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidatedORPHANET_26908619[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.

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Sources for this card