raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:461

Recessive X-linked ichthyosis

Synonyms: RXLI · Steroid sulfatase deficiency · X-linked ichthyosis · XLI

Type
Disease
Group
Disorder
Inheritance
X-linked recessive
Age of onset
Neonatal
Status
active

A rare genetic skin disease belonging to the Mendelian Disorders of Cornification (MeDOC) and characterized by generalized hyperkeratosis and scaling of the skin. The condition is rather mild.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enRecessive X-linked ichthyosisRXLI · Steroid sulfatase deficiency · X-linked ichthyosis · XLI
frIchtyose récessive liée à l'XDéficit en stéroïde sulfatase · Ichtyose liée à l'X · RXLI · XLI
deIchthyose, X-chromosomal-rezessiveXLI · RXLI · Steroidsulfatase-Mangel
esIctiosis recesiva ligada al cromosoma XDeficiencia de esteroide sulfatasa · Ictiosis ligada al cromosoma X · RXLI · XLI
itIttiosi recessiva legata all'XDeficit di solfatasi steroidea · Ittiosi legata all'X · RXLI · XLI
nlRecessieve X-gebonden ichthyosisRXLI · Steroïdesulfatasedeficiëntie · X-gebonden ichthyosis · XLI
ptIctiose ligada ao X recessivaDeficiência de sulfatase de esteroides
plRecesywna rybia łuska sprzężona z chromosomem XNiedobór sulfatazy steroidowej · RXLI · Rybia łuska sprzężona z płcią · XLI
csX-vázaná recesivní ichtyózaRXLI · Deficit steroid-sulfatázy · X-vázaná ichtyóza · XLI
ukРецесивний іхтіоз, зчеплений з Х-хромосомоюRXLI · Дефіцит стероїдної сульфатази · XLI · Х-зчеплений іхтіоз
zhX连锁隐性遗传鱼鳞病类固醇硫酸酯酶缺乏症
trX'e bağlı resesif iktiyozXLI · RXLI · X'e bağlı iktiyoz · Steroid sülfataz eksikliği

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM308100Evalidated
ICD-10Q80.1NTBTspecificvalidated
ICD-11EC20.01Especificvalidated
MONDO0010622Evalidated
MeSHD016114Evalidated
UMLSC2720163Evalidated
GARD7904Evalidated

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

2 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
STSDisease-causing germline mutation(s) inAssessedHGNC:11425ENSG00000101846300747Xp22.31steroid sulfatase10583107[PMID]_10692123[PMID]
FLGModifying germline mutation inAssessedHGNC:3748ENSG000001436311359401q21.3filaggrin29054605[PMID]
5

Prevalence and incidence

3 records
TypeClassValueAreaQualificationValidationSource
Annual incidence1-5 / 10 00015 / 100 000EuropeValue and classValidatedORPHANET
Point prevalence1-5 / 10 00016.6 / 100 000EuropeValue and classValidatedORPHANET
Annual incidence1-9 / 100 0009.9 / 100 000ItalyValue and classNot yet validated12920363[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

12 annotations · validated 2023-09-13
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0000958Dry skin
HP:0000962Hyperkeratosis
HP:0000966Hypohidrosis
HP:0008064Ichthyosis
Frequent (79-30%)
HP:0007018Attention deficit hyperactivity disorder
HP:0007759Opacification of the corneal stroma
Occasional (29-5%)
HP:0002167Abnormality of speech or vocalization
HP:0000717Autism
HP:0000028Cryptorchidism
HP:0007549Desquamation of skin soon after birth
HP:0001270Motor delay
Very rare (<4-1%)
HP:0001249Intellectual disability

Run the differential on the 4 obligate / very frequent terms

Annotation source: 37363400[PMID]_29672931[PMID]

7

Sources for this card