raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:289307

Developmental delay due to methylmalonate semialdehyde dehydrogenase deficiency

Synonyms: Developmental delay due to ALDH6A1 deficiency · Developmental delay due to MMSDH deficiency

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

A rare, genetic, inborn error of branched-chain amino acid metabolism disorder, with a highly variable clinical and biochemical phenotype, typically characterized by mild to severe global developmental delay, elevated methylmalonic acid and, occasionally, lactic acid plasma levels, and chronic methylmalonic aciduria, which may be accompanied by elevation of additional organic or amino acids in urine (e.g. beta-alanine, methionine, 3-hydroxypropionic, 3-aminoisobutyric and/or 3-hydroxyisobutyric acid). Microcephaly, mild craniofacial dysmorphism, axial hypotonia, liver failure, and central nervous system abnormalities on MRI have also been reported.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enDevelopmental delay due to methylmalonate semialdehyde dehydrogenase deficiencyDevelopmental delay due to ALDH6A1 deficiency · Developmental delay due to MMSDH deficiency
frRetard de développement par déficit en méthylmalonate semialdéhyde déshydrogénaseRetard de développement par déficit en ALDH6A1 · Retard de développement par déficit en MMSDH
deEntwicklungsverzögerung durch Methylmalonat-Semialdehyd-Dehydrogenase-MangelEntwicklungsverzögerung durch ALDH6A1-Mangel · Entwicklungsverzögerung durch MMSDH-Mangel
esRetraso del desarrollo por deficiencia de metilmalonato semialdehído deshidrogenasaRetraso del desarrollo por deficiencia de ALDH6A1 · Retraso del desarrollo por deficiencia de MMSDH
itRitardo dello sviluppo da deficit di metilmalonato semialdeide deidrogenasiRitardo dello sviluppo da deficit di ALDH6A1 · Ritardo dello sviluppo da deficit di MMSDH
nlOntwikkelingsachterstand door methylmalonaat-semialdehydedehydrogenasedeficiëntieOntwikkelingsachterstand door ALDH6A1-deficiëntie · Ontwikkelingsachterstand door MMSDH-deficiëntie
ptPerturbação do desenvolvimento por deficiência de metilmalonato semialdeído desidrogenasePerturbação do desenvolvimento por deficiência de ALDH6A1 · Perturbação do desenvolvimento por deficiência de MMSDH
plOpóźnienie rozwoju z powodu niedoboru dehydrogenazy semialdehydu metylomalonowegoOpóźnienie rozwoju z powodu niedoboru ALDH6A1 · Opóźnienie rozwoju z powodu niedoboru MMSDH
csVývojové opoždění způsobené deficitem methylmalonátsemialdehyddehydrogenázyVývojové opoždění způsobené deficitem ALDH6A1 · Vývojové opoždění způsobené deficitem MMSDH
ukЗатримка розвитку через дефіцит метилмалонатдегідрогенази напівдегідрогеназиЗатримка розвитку через дефіцит ALDH6A1 · Затримка розвитку через дефіцит MMSDH
zh甲基丙二酸半醛脱氢酶缺乏所致发育迟缓甲基丙二酸半醛脱氢酶缺乏所致发育迟缓
trMetilmalonat semialdehit dehidrogenaz eksikliğine bağlı gelişme geriliğiMMSDH eksikliğine bağlı gelişme geriliği · ALDH6A1 eksikliğine bağlı gelişme geriliği

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM614105Evalidated
ICD-10E71.1NTBTattributedvalidated
ICD-115C50.E0NTBTindexvalidated
MONDO0013579Evalidated
UMLSC5190633Evalidated

E exact · NTBT this ORPHAcode is narrower than the target · BTNT broader than the target · ND not decided.

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Classification

Preferential parent (Orphanet linearisation):

Parents in the classifications (1):

No children.

4

Genes

1 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
ALDH6A1Disease-causing germline mutation(s) inAssessedHGNC:7179ENSG0000011971160317814q24.3aldehyde dehydrogenase 6 family member A121863277[PMID]_10971205[PMID]
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Prevalence and incidence

1 record
TypeClassValueAreaQualificationValidationSource
Point prevalence<1 / 1 000 000—EuropeClass onlyNot yet validatedORPHANET

Value is Orphadata's ValMoy: the mean estimate per 100 000 for prevalence and incidence, the number of cases or families for case reports.

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HPO phenotypes

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

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Sources for this card