raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:261295

20p12.3 microdeletion syndrome

Synonyms: Del(20)(p12.3) · Monosomy 20p12.3

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

20p12.3 microdeletion syndrome is a recently described syndrome characterized by Wolff-Parkinson-White syndrome, variable developmental delay and facial dysmorphism.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
en20p12.3 microdeletion syndromeDel(20)(p12.3) · Monosomy 20p12.3
frSyndrome de microdélétion 20p12.3Del(20)(p12.3) · Monosomie 20p12.3
deMikrodeletionssyndrom 20p12.3Del(20)(p12.3) · Monosomie 20p12.3
esSíndrome de microdeleción 20p12.3Del(20)(p12.3) · Monosomía 20p12.3
itSindrome da microdelezione 20p12.3Del(20)(p12.3) · Monosomia 20p12.3
nl20p12.3-microdeletiesyndroomDel(20)(p12.3) · Monosomie 20p12.3
ptSíndrome de microdeleção 20p12.3
plZespół mikrodelecji 20p12.3Del(20)(p12.3) · Monosomia 20p12.3
csSyndrom mikrodelece 20p12.3Del(20)(p12.3) · Monozomie 20p12.3
ukСиндром мікроделеції 20p12.3Del(20)(p12.3) · Моносомія 20p12.3
zh20p12.3微缺失综合征20p12.3单体
tr20p12.3 mikrodelesyon sendromuDel (20) (p12.3) · Monozomi 20p12.3

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM617877Evalidated
ICD-10Q93.5NTBTattributedvalidated
ICD-11LD44.L1NTBTindexvalidated
MONDO0016841Evalidated
UMLSC4304539Evalidated
GARD12492Evalidated

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
BMP2Role in the phenotype ofAssessedHGNC:1069ENSG0000012584511226120p12.3bone morphogenetic protein 218812404[PMID]_21671386[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families3 casesWorldwideCase(s)Validated18812404[PMID]
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidatedORPHANET_18812404[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

23 annotations · validated 2016-06-01
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0001263Global developmental delay
HP:0000316Hypertelorism
Frequent (79-30%)
HP:0000494Downslanted palpebral fissures
HP:0000286Epicanthus
HP:0000327Hypoplasia of the maxilla
HP:0000256Macrocephaly
HP:0000272Malar flattening
HP:0000160Narrow mouth
HP:0004322Short stature
HP:0001716Wolff-Parkinson-White syndrome
Occasional (29-5%)
HP:0001631Atrial septal defect
HP:0010059Broad hallux phalanx
HP:0011304Broad thumb
HP:0005280Depressed nasal bridge
HP:0000293Full cheeks
HP:0001252Hypotonia
HP:0000343Long philtrum
HP:0008551Microtia
HP:0000768Pectus carinatum
HP:0001250Seizure
HP:0000391Thickened helices
HP:0002119Ventriculomegaly
HP:0000431Wide nasal bridge

Run the differential on the 2 obligate / very frequent terms

Annotation source: 18812404[PMID]

7

Sources for this card