raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:453499

Neurodevelopmental disorder-craniofacial dysmorphism-cardiac defect-skeletal anomalies syndrome

Synonyms: Au-Kline syndrome · HNRNPK-related neurodevelopmental disorder · Okamoto syndrome

Type
Malformation syndrome
Group
Disorder
Inheritance
Autosomal dominant, Not applicable
Age of onset
Antenatal, Infancy, Neonatal
Status
active

A rare genetic multiple congenital anomalies/dysmorphic syndrome characterized by global developmental delay, intellectual disability, hypotonia, craniofacial dysmorphism (such as ridged metopic sutures, long palpebral fissures, broad nasal bridge, hypoplastic alae nasi, low-set, prominent ears, prominent midline tongue groove, and downturned mouth), congenital heart defects, and variable skeletal abnormalities including hip dysplasia, vertebral anomalies, and scoliosis. Additional reported manifestations include high pain tolerance and genitourinary anomalies. Brain imaging may show a thin corpus callosum or white matter abnormalities.

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Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enNeurodevelopmental disorder-craniofacial dysmorphism-cardiac defect-skeletal anomalies syndromeAu-Kline syndrome · HNRNPK-related neurodevelopmental disorder · Okamoto syndrome
frSyndrome de dysmorphie craniofaciale-anomalies squelettiques-cardiopathie-trouble neurologique du développementSyndrome d'Au-Kline · Syndrome d'Okamoto
deNeurologische Entwicklungsstörungen-kranio-faziale Dysmorphie-Herzfehler-Skelettanomalie-SyndromAu-Kline-Syndrom · HNRNPK-bedingte neurologische Entwicklungsstörung · Okamoto-Syndrom
esSíndrome de trastorno del neurodesarrollo-dismorfia craneofacial-defecto cardíaco-anomalías esqueléticasSíndrome de Au-Kline · Trastorno del neurodesarrollo asociado a HNRNPK
itMalattia del neurosviluppo-dismorfismi craniofacciali-cardiopatie-anomalie scheletricheMalattia del neurosviluppo correlata a HNRNPK · Sindrome di Au-Kline · Sindrome di Okamoto
nlNeurologische ontwikkelingsstoornis - craniofaciale dysmorfie - hartdefect - skeletanomalieën-syndroomHNRNPK-gerelateerde neurologische ontwikkelingsstoornis · Syndroom van Au-Kline · Syndroom van Okamoto
ptSíndrome de doença do neurodesenvolvimento-dismorfia craniofacial-anomalia cardíaca-anomalias esqueléticasDoença do neurodesenvolvimento HNRNPK-relacionada · Síndrome Au-Kline · Síndrome Okamoto
plZespół zaburzeń neurorozwojowych-dysmorfii twarzoczaszki-wady serca-anomalii szkieletowychZespół zaburzeń neurorozwojowych, dysmorfii czaszkowo-twarzowej, z towarzyszącymi wadami serca i kości
csSyndrom zahrnující neurovývojovou poruchu, kraniofaciální dysmorfismus, srdeční vady a kyčelní dysplázii= en
ukСиндром порушення нейророзвитку-черепно-лицьового дизморфізму-серцевої вади-скелетних аномалійСиндром Ау-Клайна · Повязане з HNRNPK порушення нейророзвитку · Синдром Окамото
zh神经发育障碍-颅面畸形-心脏缺损-骨骼异常综合征金氏综合征
trNörogelişimsel bozukluk-kraniyofasiyal dismorfizm-kalp defekti-iskelet anomalileri sendromuAu-Kline sendromu

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM616580BTNTvalidated
ICD-10Q87.8NTBTattributedvalidated
ICD-11LD2F.1YNTBTattributedvalidated
MONDO18681Evalidated
UMLSC4225274Evalidated

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 (4):

Children (2):

Codes that Orphanet moved or referred to this one:

4

Genes

0 direct · 2 via subtypes

Orphanet records no gene directly on this code.

Recorded by Orphanet on subtypes of this disorder:

GeneSubtypeAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
HNRNPKORPHA:453504Neurodevelopmental disorder-craniofacial dysmorphism-cardiac defect-skeletal anomalies syndrome due to a point mutationDisease-causing germline mutation(s) (loss of function) inAssessedHGNC:5044ENSG000001651196007129q21.32heterogeneous nuclear ribonucleoprotein K26173930[PMID]
HNRNPKORPHA:352665Neurodevelopmental disorder-craniofacial dysmorphism-cardiac defect-skeletal anomalies syndrome due to 9q21.3 microdeletionRole in the phenotype ofAssessedHGNC:5044ENSG000001651196007129q21.32heterogeneous nuclear ribonucleoprotein K26173930[PMID]_24501764[PMID]_25348648[PMID]
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Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families25 casesWorldwideCase(s)Validated29904177[PMID]_30998304[PMID]
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidatedORPHANET_30998304[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.

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HPO phenotypes

71 annotations · validated 2019-12-10
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0001627Abnormal heart morphology
HP:0011039Abnormal helix morphology
HP:0000119Abnormality of the genitourinary system
HP:0000280Coarse facial features
HP:0000750Delayed speech and language development
HP:0000126Hydronephrosis
HP:0001252Hypotonia
HP:0001249Intellectual disability
HP:0000276Long face
HP:0000637Long palpebral fissure
HP:0001270Motor delay
HP:0002465Poor speech
HP:0000431Wide nasal bridge
Frequent (79-30%)
HP:0012332Abnormal autonomic nervous system physiology
HP:0000175Cleft palate
HP:0002019Constipation
HP:0001363Craniosynostosis
HP:0000028Cryptorchidism
HP:0002714Downturned corners of mouth
HP:0001508Failure to thrive
HP:0000221Furrowed tongue
HP:0002020Gastroesophageal reflux
HP:0002579Gastrointestinal dysmotility
HP:0000365Hearing impairment
HP:0000218High palate
HP:0001385Hip dysplasia
HP:0002079Hypoplasia of the corpus callosum
HP:0010880Increased nuchal translucency
HP:0001511Intrauterine growth retardation
HP:0003186Inverted nipples
HP:0000252Microcephaly
HP:0000194Open mouth
HP:0005487Prominent metopic ridge
HP:0000508Ptosis
HP:0001315Reduced tendon reflexes
HP:0002650Scoliosis
HP:0000586Shallow orbits
HP:0001883Talipes
HP:0000430Underdeveloped nasal alae
HP:0001629Ventricular septal defect
HP:0003422Vertebral segmentation defect
HP:0000076Vesicoureteral reflux
Occasional (29-5%)
HP:0025487Abnormality of bladder morphology
HP:0001284Areflexia
HP:0004970Ascending tubular aorta aneurysm
HP:0001631Atrial septal defect
HP:0006695Atrioventricular canal defect
HP:0001647Bicuspid aortic valve
HP:0000193Bifid uvula
HP:0009794Branchial anomaly
HP:0003763Bruxism
HP:0000589Coloboma
HP:0000476Cystic hygroma
HP:0002282Gray matter heterotopia
HP:0002046Heat intolerance
HP:0000666Horizontal nystagmus
HP:0007550Hypohidrosis or hyperhidrosis
HP:0000821Hypothyroidism
HP:0007328Impaired pain sensation
HP:0000158Macroglossia
HP:0001324Muscle weakness
HP:0011470Nasogastric tube feeding in infancy
HP:0000677Oligodontia
HP:0000938Osteopenia
HP:0001357Plagiocephaly
HP:0002202Pleural effusion
HP:0004467Preauricular pit
HP:0001954Recurrent fever
HP:0001250Seizure
HP:0003396Syringomyelia
Very rare (<4-1%)
HP:0011024Abnormality of the gastrointestinal tract

Run the differential on the 12 obligate / very frequent terms

Annotation source: 30998304[PMID]_29904177[PMID]

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Sources for this card