raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:96187

Maternal uniparental disomy of chromosome 21 syndrome

Synonyms: UPD(21)mat

Type
Malformation syndrome
Group
Disorder
Status
active

A uniparental disomy of maternal origin that does not seem to have an adverse impact on the phenotype of an individual. There is a possibility of homozygosity for a recessive disease mutation for which the mother is a carrier and specific phenotype depends on the inherited disorder.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enMaternal uniparental disomy of chromosome 21 syndromeUPD(21)mat
frSyndrome de disomie uniparentale maternelle du chromosome 21UPD(21) maternelle · UPD(21)mat
deUniparentale Disomie 21, maternale= en
esSíndrome de disomía uniparental materna del cromosoma 21= en
itSindrome disomia uniparentale materna del cromosoma 21= en
nlMaternale uniparentale disomie van chromosoom 21-syndroom= en
ptDissomia uniparental de origem materna, cromossoma 21
plZespół jednorodzicielskiej disomii chromosomu 21 pochodzenia matczynego= en
csMaternální uniparentální dizomie chromozomu 21= en
ukМатеринська уніпарентна дисомія хромосоми 21= en
zh母源性21号染色体单亲二体母源性UPD(21)
tr21. kromozomun maternal uniparental dizomisiUPD (21) mat

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
ICD-10Q99.8NTBTattributedvalidated
ICD-11LD45.0NTBTindexvalidated
MONDO0019918Evalidated
UMLSC5190523Evalidated

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

0 direct

Orphanet records no gene directly on this code.

5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families2 casesWorldwideCase(s)ValidatedISBN:978-3-642-55287-8[OTHER]
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidatedORPHANET_ISBN:978-3-642-55287-8[OTHER]

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

Orphanet has no HPO annotation for this code in this release.

7

Sources for this card