spastic ataxia 4
Findings
No curated finding names spastic ataxia 4 yet. Everything below is reference data from Mondo, HPO and GenCC, not evidence about what affects it.
Definition
Any autosomal recessive spastic ataxia in which the cause of the disease is a mutation in the MTPAP gene.
Definition from the Mondo Disease Ontology (MONDO:0013354), read 2026-09-29. CC BY 4.0.
- Inheritance
- Autosomal recessive inheritance
- Onset and course
- Infantile onset · Slowly progressive
HPO, annotations 2026-09-02
Features
23 features
What the disease is reported to present with, and how often among people who have it — never how often a feature means the disease. HPO, annotations 2026-09-02.
- DysarthriaHPOHP:0001260
- 6 of 6 reported patients
- Very frequent (80% to 99% of cases)
- Gait ataxiaHPOHP:0002066
- 6 of 6 reported patients
- Optic atrophyHPOHP:0000648
- 4 of 4 reported patients
- Very frequent (80% to 99% of cases)
- Babinski signHPOHP:0003487
- 5 of 6 reported patients
- Very frequent (80% to 99% of cases)
- Hyperactive patellar reflexHPOHP:0007083
- 5 of 6 reported patients
- HyperreflexiaHPOHP:0001347
- Very frequent (80% to 99% of cases)
Show the remaining 11
- Motor delayHPOHP:0001270
- Frequent (30% to 79% of cases)
- Movement abnormality of the tongueHPOHP:0000182
- Frequent (30% to 79% of cases)
- MyoclonusHPOHP:0001336
- Frequent (30% to 79% of cases)
- NystagmusHPOHP:0000639
- 2 of 6 reported patients
- Frequent (30% to 79% of cases)
- Progressive cerebellar ataxiaHPOHP:0002073
- Frequent (30% to 79% of cases)
- Progressive gait ataxiaHPOHP:0007240
- Frequent (30% to 79% of cases)
Genes
1 gene
Germline variants in the gene encoding each protein, as classified by GenCC submitters, each in their own words. Limited, disputed and refuted submissions are listed too.
- MTPAPHGNC:25532
- Strong · Labcorp Genetics (formerly Invitae) · Autosomal recessive · 2020
- Strong · PanelApp Australia · Autosomal recessive · 2025
- Supportive · Orphanet · Autosomal recessive · 2021
Where it sits
Other names
5 names
Resolves to: spastic ataxia 4
- Also called
- autosomal recessive spastic ataxia caused by mutation in MTPAPautosomal recessive spastic ataxia type 4MTPAP autosomal recessive spastic ataxiaspastic ataxia type 4SPAX4