raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:676039

Combined immunodeficiency due to FOXN1 haploinsufficiency

Type
Disease
Group
Disorder
Inheritance
Autosomal dominant
Age of onset
Childhood, Infancy, Neonatal
Status
active

A rare non-severe combined immunodeficiency characterized by decreased numbers of T cells (particularly CD8+ T cells) and increased susceptibility to recurrent infections with variable severity (predominantly respiratory viral infections). Additional features may include thymic aplasia/hypoplasia, skin abnormalities including atopic dermatitis, hair loss and nail dystrophy. Symptoms may vary among patients (some patients may develop serious infections) and may ameliorate by age.

1

Names in Orphadata languages

10 of 12 languages
LangNameSynonyms
enCombined immunodeficiency due to FOXN1 haploinsufficiency
frDéficit immunitaire combiné par haploinsuffisance en FOXN1
deKombinierter Immundefekt durch FOXN1-Haploinsuffizienz
esInmunodeficiencia combinada por haploinsuficiencia del gen FOXN1
itImmunodeficienza combinata da aploinsufficienza di FOXN1
nlGecombineerde immuundeficiëntie door FOXN1-haploinsufficiëntie
ptImunodeficiência combinada por haploinsuficiência FOXN1
plSkojarzony niedobór odporności spowodowany haploinsufficiencją FOXN1
csKombinovaná imunodeficience způsobená haploinsuficiencí FOXN1
ukКомбінований імунодефіцит, зумовлений гаплонедостатністю FOXN1

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM618806Evalidated
ICD-10D81.8NTBTattributedvalidated
MONDO32928Evalidated
UMLSC5925099Evalidated

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
FOXN1Disease-causing germline mutation(s) inAssessedHGNC:12765ENSG0000010910160083817q11.2forkhead box N131447097[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families21 casesWorldwideCase(s)Validated31447097[PMID]
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidated31447097[PMID]_ORPHANET

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