raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:309324

Free sialic acid storage disease, infantile form

Synonyms: ISSD

Type
Clinical subtype
Group
Subtype of disorder
Inheritance
Autosomal recessive
Age of onset
Antenatal, Neonatal
Status
active

This disease is described under Free sialic acid storage disease

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enFree sialic acid storage disease, infantile formISSD
frMaladie de surcharge en acide sialique libre, forme infantile= en
deInfantile Sialinsäure-Speicherkrankheit= en
esEnfermedad por almacenamiento de ácido siálico libre, forma infantil= en
itMalattia da deposito di acido sialico libero, forma infantile= en
nlVrij-siaalzuurstapelingsziekte, infantiele vorm= en
ptDoença de armazenamento do ácido siálico livre, forma da infância= en
plChoroba spichrzania wolnego kwasu sialowego, postać niemowlęca= en
csPorucha ukládání volné sialové kyseliny, infantilní forma= en
ukХвороба накопичення вільної сіалової кислоти, інфантильна форма= en
zh婴儿型游离唾液酸贮积病= en
trSerbest sialik asit depo hastalığı, infantil form= en
2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM269920Evalidated
ICD-10E77.8NTBTattributedvalidated
ICD-115C56.4NTBTattributedvalidated
MONDO0010027Evalidated
UMLSC1096902Evalidated
GARD175Evalidated
MedDRA10067532Evalidated

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

1 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
SLC17A5Disease-causing germline mutation(s) inAssessedHGNC:10933ENSG000001198996043226q13solute carrier family 17 member 520301643[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Prevalence at birth1-9 / 1 000 0000.14 / 100 000SwedenValue and classValidated25274184[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

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

7

Sources for this card