raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:163690

Hypotonia-cystinuria syndrome

Synonyms: HCS

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

A rare, genetic disorder of amino acid absorption and transport, characterized by generalized hypotonia at birth, neonatal/infantile failure to thrive (followed by hyperphagia and rapid weight gain in late childhood), cystinuria type 1, nephrolithiasis, growth retardation due to growth hormone deficiency, and minor facial dysmorphism. Dysmorphic features mainly include dolichocephaly and ptosis. Nephrolithiasis occurs at variable ages.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enHypotonia-cystinuria syndromeHCS
frSyndrome d'hypotonie-cystinurie
deHypotonie-Cystinurie-Syndrom
esSíndrome de hipotonía-cistinuria= en
itSindrome ipotonia-cistinuria= en
nlHypotonie - cystinurie-syndroom= en
ptSíndrome hipotonia - cistinúria
plZespół hipotonia - cystynuria= en
csSyndrom zahrnující hypotonii a cystinurii= en
ukСиндром гіпотонії-цистинурії= en
zh肌张力低下-胱氨酸尿症综合征= en
trHipotoni-sistinüri sendromu= en

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM606407Evalidated
ICD-10E72.0NTBTattributedvalidated
ICD-115C60.YNTBTindexvalidated
MONDO0011669Evalidated
MeSHC564710Evalidated
UMLSC1848030Evalidated
MedDRA10083099Evalidated

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

2 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
PREPLRole in the phenotype ofAssessedHGNC:30228ENSG000001380786095572p21prolyl endopeptidase like16385448[PMID]
SLC3A1Role in the phenotype ofAssessedHGNC:11025ENSG000001380791046142p21solute carrier family 3 member 116385448[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidatedORPHANET
Cases/families22 casesWorldwideCase(s)Validated23794250[PMID]

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

14 annotations · validated 2016-06-01
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0003131Cystinuria
HP:0001558Decreased fetal movement
HP:0000268Dolichocephaly
HP:0001508Failure to thrive
HP:0001510Growth delay
HP:0001611Hypernasal speech
HP:0001252Hypotonia
HP:0000787Nephrolithiasis
HP:0002591Polyphagia
HP:0000508Ptosis
Frequent (79-30%)
HP:0000286Epicanthus
HP:0012378Fatigue
HP:0002007Frontal bossing
HP:0000278Retrognathia

Run the differential on the 10 obligate / very frequent terms

7

Sources for this card