raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:96147

Kleefstra syndrome due to 9q34 microdeletion

Synonyms: 9q subtelomeric deletion syndrome · 9qSTDS · Kleefstra syndrome due to 9q subtelomeric deletion · Kleefstra syndrome due to del(9)(q34) · Kleefstra syndrome due to monosomy 9q34

Type
Etiological subtype
Group
Subtype of disorder
Inheritance
Not applicable
Age of onset
Infancy, Neonatal
Status
active

This disease is described under Kleefstra syndrome

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enKleefstra syndrome due to 9q34 microdeletion9q subtelomeric deletion syndrome · 9qSTDS · Kleefstra syndrome due to 9q subtelomeric deletion · Kleefstra syndrome due to del(9)(q34) · Kleefstra syndrome due to monosomy 9q34
frSyndrome de Kleefstra dû à une microdélétion 9q349qSTDS · Syndrome de Kleefstra dû à une del(9)(q34) · Syndrome de Kleefstra dû à une délétion subtélomérique 9q · Syndrome de Kleefstra dû à une monosomie 9q34
deKleefstra-Syndrom durch Mikrodeletion 9q349qSTDS · Kleefstra-Syndrom durch del(9)(q34) · Kleefstra-Syndrom durch subtelomere Deletion 9q · Subtelomes Deletionssyndrom 9q
esSíndrome de Kleefstra por microdeleción 9q349qSTDS · Síndrome de Kleefstra por del(9)(q34) · Síndrome de Kleefstra por deleción subtelomérica 9q · Síndrome de Kleefstra por monosomía 9q34 · Síndrome de deleción subtelomérica 9q
itSindrome di Kleefstra da microdelezione 9q349qSTDS · Sindrome da delezione 9q subtelomerica · Sindrome di Kleefstra da del(9)(q34) · Sindrome di Kleefstra da delezione 9q subtelomerica · Sindrome di Kleefstra da monosomia 9q34
nlSyndroom van Kleefstra door 9q34-microdeletie9p subtelomerische deletie-syndroom · 9qSTDS · Syndroom van Kleefstra door 9q subtelomerische deletie · Syndroom van Kleefstra door del(9)(q34) · Syndroom van Kleefstra door monosomie 9q34
ptMonossomia distal 9q34
plZespół Kleefstra z powodu mikrodelecji 9q349qSTDS · Zespół delecji subtelomerowej 9q · Zespół Kleefstra z powodu del(9)(q34) · Zespół Kleefstra z powodu delecji subtelomerowej 9q · Zespół Kleefstra z powodu monosomii 9q34
csSyndrom Kleefstrové způsobený mikrodelecí 9q34Syndrom 9q subtelomerické delece · 9qSTDS · Syndrom Kleefstrové způsobený 9q subtelomerickou delecí · Syndrom Kleefstrové způsobený del(9)(q34) · Syndrom Kleefstrové způsobený monozomií 9q34
ukСиндром Клефстри, зумовлений мікроделецією 9q34Синдром субтеломерної делеції 9q · 9qSTDS · Синдром Клефстри, зумовлений делецією субтеломеру 9q · Синдром Клефстри, зумовлений дефіцитом del(9)(q34) · Синдром Клефстри, зумовлений моносомією 9q34
zh9q34微缺失所致Kleefstra综合征9号染色体长臂亚端粒缺失所致Kleefstra综合征
tr9q34 mikrodelesyonuna bağlı Kleefstra sendromu9qSTDS · 9q subtelomerik delesyon sendromu · Del (9) (q34)'e bağlı Kleefstra sendromu · Monozomi 9q34'e bağlı Kleefstra sendromu · 9q subtelomerik delesyona bağlı Kleefstra sendromu
2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM610253NTBTvalidated
ICD-10Q87.8NTBTattributedvalidated
ICD-11LD2F.1YNTBTattributedvalidated
MONDO0019896Evalidated
UMLSC0795833Evalidated

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 (3):

No children.

4

Genes

1 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
EHMT1Role in the phenotype ofAssessedHGNC:24650ENSG000001810906070019q34.3euchromatic histone lysine methyltransferase 120945554[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families86 casesWorldwideCase(s)Validated22670141[PMID]
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidatedORPHANET

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

55 annotations · validated 2017-07-13
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0000463Anteverted nares
HP:0002381Aphasia
HP:0000248Brachycephaly
HP:0010529Echolalia
HP:0000232Everted lower lip vermilion
HP:0005469Flat occiput
HP:0001263Global developmental delay
HP:0002553Highly arched eyebrow
HP:0000316Hypertelorism
HP:0001252Hypotonia
HP:0001249Intellectual disability
HP:0002300Mutism
HP:0003196Short nose
HP:0001328Specific learning disability
Frequent (79-30%)
HP:0001671Abnormal cardiac septum morphology
HP:0000035Abnormal testis morphology
HP:0000717Autism
HP:0000028Cryptorchidism
HP:0002714Downturned corners of mouth
HP:0011097Epileptic spasm
HP:0002121Generalized non-motor (absence) seizure
HP:0000158Macroglossia
HP:0000252Microcephaly
HP:0011800Midface retrusion
HP:0001513Obesity
HP:0010808Protruding tongue
HP:0001250Seizure
HP:0002133Status epilepticus
HP:0000664Synophrys
Occasional (29-5%)
HP:0001331Absent septum pellucidum
HP:0001274Agenesis of corpus callosum
HP:0000739Anxiety
HP:0001659Aortic regurgitation
HP:0001650Aortic valve stenosis
HP:0000741Apathy
HP:0000708Atypical behavior
HP:0002120Cerebral cortical atrophy
HP:0100308Cerebral cortical hemiatrophy
HP:0001680Coarctation of aorta
HP:0001710Conotruncal defect
HP:0000716Depression
HP:0001508Failure to thrive
HP:0011968Feeding difficulties
HP:0100541Femoral hernia
HP:0001510Growth delay
HP:0000365Hearing impairment
HP:0008736Hypoplasia of penis
HP:0000023Inguinal hernia
HP:0000737Irritability
HP:0000083Renal insufficiency
HP:0002360Sleep abnormality
HP:0012157Subcortical cerebral atrophy
HP:0001636Tetralogy of Fallot
HP:0002119Ventriculomegaly
HP:0000076Vesicoureteral reflux

Run the differential on the 12 obligate / very frequent terms

7

Sources for this card