raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:293168

Infantile-onset ascending hereditary spastic paralysis

Synonyms: IAHSP

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

Infantile-onset ascending hereditary spastic paralysis (IAHSP) is a very rare motor neuron disease characterized by severe spasticity of the lower limbs in early life, progression of spasticity to the upper limbs in late childhood, and dysarthria.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enInfantile-onset ascending hereditary spastic paralysisIAHSP
frParalysie spastique infantile ascendante héréditaire= en
deHereditäre Spastische Paralyse, aufsteigende, des frühen Kindesalters= en
esParálisis espástica ascendente hereditaria de inicio en el lactante= en
itParalisi spastica ascendente ereditaria a esordio infantile= en
nlOpstijgende erfelijke spastische paralyse met infantiele aanvang= en
ptParalisia espástica ascendente hereditária de início na infância= en
plDziedziczne wstępujące porażenie spastyczne o początku w wieku niemowlęcym= en
csVzestupná dědičná spastická paralýza s nástupem v kojeneckém věku= en
ukВисхідний спадковий спастичний параліч, що починається в дитинстві= en
zh婴儿起病的上行性遗传性痉挛性瘫痪婴儿起病上行性遗传性痉挛性瘫痪
trİnfantil-başlangıçlı artan kalıtsal spastik paraliz= en

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM607225Evalidated
ICD-10G12.2NTBTattributedvalidated
MONDO0011797Evalidated
MeSHC537217Evalidated
UMLSC2931441Evalidated
GARD4914Evalidated

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

1 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
ALS2Disease-causing germline mutation(s) inAssessedHGNC:443ENSG000000033936063522q33.1alsin Rho guanine nucleotide exchange factor ALS224315819[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families17 familiesWorldwideFamily(ies)Validated12145748[PMID]_12919135[PMID]_12601111[PMID]_12509863[PMID]_18394004[PMID]_16718699[PMID]_18810511[PMID]_18523452[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

11 annotations · validated 2016-06-01
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0007256Abnormal pyramidal sign
HP:0002425Anarthria
HP:0001260Dysarthria
HP:0001347Hyperreflexia
HP:0005216Impaired mastication
HP:0001258Spastic paraplegia
HP:0002510Spastic tetraplegia
HP:0001257Spasticity
HP:0002445Tetraplegia
Frequent (79-30%)
HP:0000496Abnormality of eye movement
HP:0002193Pseudobulbar behavioral symptoms

Run the differential on the 9 obligate / very frequent terms

7

Sources for this card