raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:75857

6q terminal deletion syndrome

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

A rare partial deletion of the long arm of chromosome 6 characterized by a variable clinical phenotype that includes a characteristic craniofacial dysmorphism (including microcephaly, broad nose with prominent nasal root and bulbous nasal tip, large ears that may be malformed and low-set, characteristic downturned mouth, and short neck), global development delay, intellectual disability, and variable, non-specific, congenital malformations. Muscular hypotonia, seizures, retinal anomalies, and variable brain abnormalities have been reported in association.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
en6q terminal deletion syndrome
frSyndrome de délétion 6q terminale
deTerminales 6q-Deletion-Syndrom
esSíndrome de deleción terminal 6q
itSindrome da delezione 6q terminale
nlTerminale 6q-deletiesyndroom
ptDeleção terminal 6q
plZespół delecji terminalnej 6q
cs6q terminální deleční syndrom
ukСиндром термінальної делеції 6q
zh6号染色体长臂末端缺失综合征
tr6q terminal delesyon sendromu

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
ICD-10Q93.5NTBTattributedvalidated
ICD-11LD44.60NTBTindexvalidated
MONDO0019164Evalidated
UMLSC4304514Evalidated

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.

4

Genes

1 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
ERMARDRole in the phenotype ofAssessedHGNC:21056ENSG000001300236155326q27ER membrane associated RNA degradation24056535[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families19 casesWorldwideCase(s)Validated16329114[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

49 annotations · validated 2016-03-23
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0002500Abnormal cerebral white matter morphology
HP:0001999Abnormal facial shape
HP:0002269Abnormality of neuronal migration
HP:0002538Abnormality of the cerebral cortex
HP:0001321Cerebellar hypoplasia
HP:0030048Colpocephaly
HP:0000750Delayed speech and language development
HP:0001508Failure to thrive
HP:0008947Floppy infant
HP:0001263Global developmental delay
HP:0002282Gray matter heterotopia
HP:0002705High, narrow palate
HP:0000316Hypertelorism
HP:0002079Hypoplasia of the corpus callosum
HP:0002521Hypsarrhythmia
HP:0001256Intellectual disability, mild
HP:0000294Low anterior hairline
HP:0000347Micrognathia
HP:0007165Periventricular heterotopia
HP:0002126Polymicrogyria
HP:0000358Posteriorly rotated ears
HP:0001250Seizure
HP:0000486Strabismus
Frequent (79-30%)
HP:0001310Dysmetria
HP:0002066Gait ataxia
HP:0000540Hypermetropia
HP:0001382Joint hypermobility
HP:0000639Nystagmus
HP:0012471Thick vermilion border
Occasional (29-5%)
HP:0006712Aplasia/Hypoplasia of the ribs
HP:0000289Broad philtrum
HP:0030084Clinodactyly
HP:0000268Dolichocephaly
HP:0000771Gynecomastia
HP:0001822Hallux valgus
HP:0002553Highly arched eyebrow
HP:0000962Hyperkeratosis
HP:0000047Hypospadias
HP:0000256Macrocephaly
HP:0001513Obesity
HP:0001741Phimosis
HP:0001357Plagiocephaly
HP:0011220Prominent forehead
HP:0005487Prominent metopic ridge
HP:0002650Scoliosis
HP:0000470Short neck
HP:0012745Short palpebral fissure
HP:0001884Talipes calcaneovalgus
HP:0006610Wide intermamillary distance

Run the differential on the 12 obligate / very frequent terms

Annotation source: 24056535[PMID]

7

Sources for this card