raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:394

Homocystinuria due to cystathionine beta-synthase deficiency

Synonyms: CBS-deficient HCU · Classical homocystinuria · Cystathionine beta-synthase deficiency · Cystathionine beta-synthase-deficient homocystinuria · Homocystinuria due to CBS deficiency

Type
Disease
Group
Disorder
Inheritance
Autosomal recessive
Age of onset
Adolescent, Adult, Childhood
Status
active

A rare metabolic disease of methionine catabolism characterized by accumulation of methionine and homocysteine with clinical involvement of the eye, skeletal system, vascular system and central nervous system (CNS).

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enHomocystinuria due to cystathionine beta-synthase deficiencyCBS-deficient HCU · Classical homocystinuria · Cystathionine beta-synthase deficiency · Cystathionine beta-synthase-deficient homocystinuria · Homocystinuria due to CBS deficiency
frHomocystinurie par déficit en cystathionine bêta-synthaseDéficit en cystathionine bêta-synthase · HCU déficiente en CBS · Homocystinurie classique · Homocystinurie déficiente en cystathionine bêta-synthase · Homocystinurie par déficit en CBS
deHomocystinurie durch Cystathionin-beta-Synthase-MangelCBS-defiziente HCU · Cystathionin-beta-Synthase-Mangel · Homocystinurie durch CBS-Defizienz · Klassische Homocystinurie
esHomocistinuria por deficiencia de cistationina beta-sintasaDeficiencia de cistationina beta-sintasa · Homocistinuria clásica · Homocistinuria por deficiencia de CBS
itOmocistinuria da deficit di cistationina beta-sintasiDeficit di cistationina beta-sintasi · HCU da deficit di CBS · Omocistinuria da deficit di CBS · Omocistinuria da deficit di cistationina beta-sintasi · Omocistinuria classica
nlHomocystinurie door deficiëntie van cystathionine-bèta-synthaseCBS-deficiënte HCU · Cystathionine-bèta-synthase-deficiënte homocystinurie · Deficiëntie van cystathionine-bèta-synthase · Homocystinurie door CBS-deficiëntie · Klassieke homocystinurie
ptHomocistinúria devida a deficiência de cistationina beta-sintetaseDeficiência de cistationina beta-sintetase · HCU CBS-deficiência relacionada · Homocistinúria devida a deficiência de cistationina beta-sintetase
plHomocystynuria spowodowana niedoborem beta-syntazy cystationinyHomocystynuria klasyczna · Niedobór beta-syntazy cystationu
csKlasická homocystinurieDeficit cystathionin beta-syntázy · Homocystinurie způsobená deficitem cystathionin beta-syntázy
ukГомоцистинурія внаслідок дефіциту цистатіонін-бета-синтазиГомоцистінурія з дефіцитом CBS · Дефіцит цистатіонін-бета-синтази · Гомоцистинурія з дефіцитом цистатіонін-бета-синтази · Гомоцистинурія внаслідок дефіциту CBS
zh经典型高胱氨酸尿症胱硫醚β-合酶缺乏所致半胱氨酸尿症
trKlasik homosistinüriSistatiyonin beta-sentaz eksikliği · Sistatiyonin beta sentaz eksikliğine bağlı homosistinüri

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM236200Evalidated
ICD-10E72.1NTBTinclusionvalidated
ICD-115C50.BNTBTindexvalidated
MONDO0009352Evalidated
UMLSC0751202Evalidated
GARD6667Evalidated
MedDRA10071093Evalidated

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 (9):

No children.

4

Genes

1 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
CBSDisease-causing germline mutation(s) inAssessedHGNC:1550ENSG0000016020061338121q22.3cystathionine beta-synthase20301697[PMID]
5

Prevalence and incidence

9 records
TypeClassValueAreaQualificationValidationSource
Prevalence at birth1-9 / 1 000 0000.3 / 100 000WorldwideValue and classNot yet validated10328723[PMID]
Point prevalence1-9 / 100 0001.65 / 100 000EuropeValue and classValidatedEuropean Medicines Agency 2001[OTHER]
Prevalence at birth1-9 / 100 0001.5 / 100 000IrelandValue and classValidated9587032[PMID]
Prevalence at birth1-9 / 1 000 0000.77 / 100 000GermanyValue and classValidated9587032[PMID]
Prevalence at birth1-5 / 10 00015.6 / 100 000NorwayValue and classValidated15192637[PMID]
Prevalence at birth1-9 / 100 0005 / 100 000DenmarkValue and classValidated10328723[PMID]
Prevalence at birth1-9 / 100 0001.7 / 100 000AustraliaValue and classValidated646432[PMID]
Prevalence at birth1-5 / 10 00055.5 / 100 000QatarValue and classValidated19914636[PMID]
Prevalence at birth1-9 / 1 000 0000.11 / 100 000JapanValue and classValidated9587032[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

62 annotations · validated 2024-03-19
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0004337Abnormality of amino acid metabolism
HP:0001166Arachnodactyly
HP:0000678Dental crowding
HP:0001519Disproportionate tall stature
HP:0001083Ectopia lentis
HP:0002160Hyperhomocystinemia
HP:0001249Intellectual disability
HP:0000939Osteoporosis
HP:0002757Recurrent fractures
Frequent (79-30%)
HP:0000646Amblyopia
HP:0004420Arterial thrombosis
HP:0100026Arteriovenous malformation
HP:0002637Cerebral ischemia
HP:0002857Genu valgum
HP:0000822Hypertension
HP:0001387Joint stiffness
HP:0002808Kyphosis
HP:0001132Lens subluxation
HP:0000545Myopia
HP:0000768Pectus carinatum
HP:0000767Pectus excavatum
HP:0001761Pes cavus
HP:0002204Pulmonary embolism
HP:0002650Scoliosis
HP:0002209Sparse scalp hair
HP:0004936Venous thrombosis
Occasional (29-5%)
HP:0002500Abnormal cerebral white matter morphology
HP:0002071Abnormality of extrapyramidal motor function
HP:0007703Abnormality of retinal pigmentation
HP:0002039Anorexia
HP:0000739Anxiety
HP:0000708Atypical behavior
HP:0000729Autistic behavior
HP:0000518Cataract
HP:0033724Cerebral venous sinus thrombosis
HP:0000716Depression
HP:0001332Dystonia
HP:0002353EEG abnormality
HP:0002910Elevated circulating hepatic transaminase concentration
HP:0002040Esophageal varix
HP:0002239Gastrointestinal hemorrhage
HP:0000501Glaucoma
HP:0004374Hemiplegia/hemiparesis
HP:0002240Hepatomegaly
HP:0100790Hernia
HP:0000218High palate
HP:0001010Hypopigmentation of the skin
HP:0002170Intracranial hemorrhage
HP:0033505Livedo reticularis
HP:0025300Malar rash
HP:0012758Neurodevelopmental delay
HP:0008770Obsessive-compulsive trait
HP:0000648Optic atrophy
HP:0001733Pancreatitis
HP:0001300Parkinsonism
HP:0000709Psychosis
HP:0000541Retinal detachment
HP:0001250Seizure
HP:0001328Specific learning disability
HP:0000486Strabismus
HP:0001933Subcutaneous hemorrhage
HP:0001025Urticaria

Run the differential on the 9 obligate / very frequent terms

Annotation source: 27778219[PMID]_20301697[PMID]_36123115[PMID]

7

Sources for this card