raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:2273

Ichthyosis follicularis-alopecia-photophobia syndrome

Synonyms: IFAP syndrome · Ichthyosis follicularis-atrichia-photophobia syndrome

Type
Disease
Group
Disorder
Inheritance
Autosomal dominant, Not applicable, X-linked recessive
Age of onset
Infancy, Neonatal
Status
active

A rare genetic disorder characterized by the triad of ichthyosis follicularis, alopecia, and photophobia from birth.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enIchthyosis follicularis-alopecia-photophobia syndromeIFAP syndrome · Ichthyosis follicularis-atrichia-photophobia syndrome
frSyndrome d'ichtyose folliculaire-alopécie-photophobieSyndrome IFAP · Syndrome d'ichtyose folliculaire-atrichie-photophobie
deIchthyosis follicularis-Alopezie-Photophobie-SyndromIFAP-Syndrom · Ichthyosis follicularis-Atrichie-Photophobie-Syndrom
esSíndrome de ictiosis folicular-alopecia-fotofobiaIctiosis folicular-atriquia-fotofobia · Síndrome IFAP
itIttiosi follicolare - alopecia - fotofobiaIttiosi follicolare - atrichia - fotofobia · Sindrome IFAP
nlFolliculaire ichthyosis - alopecie - fotofobie-syndroomIFAP-syndroom · Ichthyosis follicularis - atrichie - fotofobie-syndroom
ptSíndrome ictiose folicular-alopecia-fotofobiaSíndrome IFAP · Síndrome ictiose folicular-atriquia-fotofobia
plRybia łuska mieszkowa - łysienie - światłowstrętRybia łuska mieszkowa - atrichia - światłowstręt · Zespół IFAP
csSyndrom zahrnující folikulární ichtyózu, alopecii a fotofobiiIFAP syndrom · Sydrom zahrnující folikulární ichtyózu, plešatost a fotofobii
ukСиндром фолікулярного іхтіозу-алопеції-світлобоязніСиндром фолікулярного іхтіозу-атрихії-світлобоязні · Синдром IFAP
zh毛囊性鱼鳞病-脱发-畏光综合症毛囊性鱼鳞病-脱发-畏光综合症
trİktiyoz follicularis-alopesi-fotofobi sendromuIFAP sendromu · İktiyoz folikülaris-atrişi-fotofobi sendromu

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM308205BTNTvalidated
OMIM619016BTNTvalidated
ICD-10Q80.8NTBTattributedvalidated
ICD-11LD27.2NTBTindexvalidated
MONDO0100213Evalidated
MONDO100212Evalidated
MONDO100213Evalidated
MeSHC536085Evalidated
UMLSC1839988Evalidated
GARD2952Evalidated

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 (4):

No children.

4

Genes

1 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
MBTPS2Disease-causing germline mutation(s) inAssessedHGNC:15455ENSG00000012174300294Xp22.12membrane bound transcription factor peptidase, site 221600032[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families40 casesWorldwideCase(s)Validated21600032[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

78 annotations · validated 2017-07-12
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0001595Abnormality of the hair
HP:0001596Alopecia
HP:0008064Ichthyosis
HP:0001249Intellectual disability
HP:0200034Papule
HP:0000613Photophobia
HP:0001250Seizure
HP:0008070Sparse hair
HP:0001328Specific learning disability
Frequent (79-30%)
HP:0000499Abnormal eyelash morphology
HP:0001597Abnormal nail morphology
HP:0000614Abnormal nasolacrimal system morphology
HP:0004370Abnormality of temperature regulation
HP:0002223Absent eyebrow
HP:0200020Corneal erosion
HP:0000726Dementia
HP:0002376Developmental regression
HP:0000964Eczematoid dermatitis
HP:0010783Erythema
HP:0001508Failure to thrive
HP:0011968Feeding difficulties
HP:0001510Growth delay
HP:0002046Heat intolerance
HP:0001812Hyperconvex fingernails
HP:0000962Hyperkeratosis
HP:0000966Hypohidrosis
HP:0001804Hypoplastic fingernail
HP:0002721Immunodeficiency
HP:0001268Mental deterioration
HP:0002718Recurrent bacterial infections
HP:0002719Recurrent infections
HP:0002205Recurrent respiratory infections
HP:0045074Thin eyebrow
HP:0012742Thin fingernail
Occasional (29-5%)
HP:0000492Abnormal eyelid morphology
HP:0040163Abnormal pelvis bone morphology
HP:0003468Abnormal vertebral morphology
HP:0000682Abnormality of dental enamel
HP:0001155Abnormality of the hand
HP:0000077Abnormality of the kidney
HP:0010935Abnormality of the upper urinary tract
HP:0000925Abnormality of the vertebral column
HP:0001331Absent septum pellucidum
HP:0002251Aganglionic megacolon
HP:0001274Agenesis of corpus callosum
HP:0000483Astigmatism
HP:0000498Blepharitis
HP:0100490Camptodactyly of finger
HP:0001321Cerebellar hypoplasia
HP:0002120Cerebral cortical atrophy
HP:0100308Cerebral cortical hemiatrophy
HP:0100825Cheilitis
HP:0000453Choanal atresia
HP:0000509Conjunctivitis
HP:0007957Corneal opacity
HP:0000028Cryptorchidism
HP:0002750Delayed skeletal maturation
HP:0100257Ectrodactyly
HP:0100534Episcleritis
HP:0002007Frontal bossing
HP:0000126Hydronephrosis
HP:0000072Hydroureter
HP:0001252Hypotonia
HP:0000023Inguinal hernia
HP:0000491Keratitis
HP:0002808Kyphosis
HP:0000400Macrotia
HP:0000252Microcephaly
HP:0000545Myopia
HP:0000639Nystagmus
HP:0012165Oligodactyly
HP:0001539Omphalocele
HP:0000926Platyspondyly
HP:0100532Scleritis
HP:0003510Severe short stature
HP:0012157Subcortical cerebral atrophy
HP:0001025Urticaria
HP:0000554Uveitis

Run the differential on the 9 obligate / very frequent terms

7

Sources for this card