raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:293948

1p21.3 microdeletion syndrome

Synonyms: Del(1)(p21.3) · Monosomy 1p21.3

Type
Malformation syndrome
Group
Disorder
Inheritance
Unknown
Age of onset
No data available
Status
active

1p21.3 microdeletion syndrome is an extremely rare chromosomal anomaly characterized by severe speech and language delay, intellectual deficiency, autism spectrum disorder.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
en1p21.3 microdeletion syndromeDel(1)(p21.3) · Monosomy 1p21.3
frSyndrome de microdélétion 1p21.3Del(1)(p21.3) · Monosomie 1p21.3
deMikrodeletionssyndrom 1p21.3Del(1)(p21.3) · Monosomie 1p21.3
esSíndrome de microdeleción 1p21.3Del(1)p(21.3) · Monosomía 1p21.3
itSindrome da microdelezione 1p21.3Del(1)p(21.3) · Monosomia 1p21.3
nl1p21.3-microdeletiesyndroomDel(1)(p21.3) · Monosomie 1p21.3
ptSíndrome de microdeleção 1p21.3Del(1)p(21.3) · Monossomia 1p21.3
plzespół mikrodelecji 1p21.3Del(1)p(21.3) · Monosomia 1p21.3
csMikrodeleční syndrom 1p21.3Del(1)p(21.3) · Monozomie 1p21.3
ukСиндром мікроделеції 1p21.3Del(1)(p21.3) · Моносомія 1p21.3
zh1p21.3微缺失综合征1p21.3单体
tr1p21.3 mikrodelesyon sendromuDel(1)(p21.3) · Monozomi 1p21.3

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
ICD-10Q93.5NTBTattributedvalidated
ICD-11LD44.11NTBTindexvalidated
MONDO0017405Evalidated
UMLSC4304578Evalidated

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
DPYDRole in the phenotype ofAssessedHGNC:3012ENSG000001886416127791p21.3dihydropyrimidine dehydrogenase22003227[PMID]_21114665[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families9 casesWorldwideCase(s)Validated22003227[PMID]_21114665[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

25 annotations · validated 2016-03-23
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0100738Abnormal eating behavior
HP:0000504Abnormality of vision
HP:0000483Astigmatism
HP:0001263Global developmental delay
HP:0001249Intellectual disability
HP:0001256Intellectual disability, mild
HP:0400004Long ear
HP:0000545Myopia
HP:0001513Obesity
HP:0100962Shyness
Frequent (79-30%)
HP:0000708Atypical behavior
HP:0000729Autistic behavior
HP:0000455Broad nasal tip
HP:0000490Deeply set eye
HP:0000750Delayed speech and language development
HP:0000293Full cheeks
HP:0000256Macrocephaly
HP:0003196Short nose
HP:0000582Upslanted palpebral fissure
Occasional (29-5%)
HP:0000718Aggressive behavior
HP:0001382Joint hypermobility
HP:0000347Micrognathia
HP:0100716Self-injurious behavior
HP:0000742Self-mutilation
HP:0000154Wide mouth

Run the differential on the 10 obligate / very frequent terms

Annotation source: 26279650[PMID]_22003227[PMID]_21114665[PMID]

7

Sources for this card