peroxisome biogenesis disorder 4B
Findings
No curated finding names peroxisome biogenesis disorder 4B yet. Everything below is reference data from Mondo, HPO and GenCC, not evidence about what affects it.
Definition
Any peroxisome biogenesis disorder due to PEX6 defect characterized by the association of early-onset cerebellar ataxia with hearing loss and blindness. Patients may also present demyelinating peripheral motor neuropathy. Cerebral MRI shows alterations of the cerebellar white matter without cerebellar atrophy.
Definition from the Mondo Disease Ontology (MONDO:0013931), read 2026-09-29. CC BY 4.0.
Features
19 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.
- BlindnessHPOHP:0000618
- Frequent (30% to 79% of cases)
- Cochlear degenerationHPOHP:0005102
- Frequent (30% to 79% of cases)
- Conjunctival telangiectasiaHPOHP:0000524
- Frequent (30% to 79% of cases)
- Elevated circulating alpha-fetoprotein concentrationHPOHP:0006254
- Frequent (30% to 79% of cases)
- Gait ataxiaHPOHP:0002066
- Frequent (30% to 79% of cases)
- Gait disturbanceHPOHP:0001288
- Frequent (30% to 79% of cases)
- Head tremorHPOHP:0002346
- Frequent (30% to 79% of cases)
- Hearing impairmentHPOHP:0000365
- Frequent (30% to 79% of cases)
- Impaired vibration sensation in the lower limbsHPOHP:0002166
- Frequent (30% to 79% of cases)
- Mildly elevated creatine kinaseHPOHP:0008180
- Frequent (30% to 79% of cases)
- NystagmusHPOHP:0000639
- Frequent (30% to 79% of cases)
- Optic atrophyHPOHP:0000648
- Frequent (30% to 79% of cases)
Reported absent (1)
- Oculomotor apraxiaHPOHP:0000657
Show the remaining 7
- Progressive cerebellar ataxiaHPOHP:0002073
- Frequent (30% to 79% of cases)
- Proximal amyotrophyHPOHP:0007126
- Frequent (30% to 79% of cases)
- Sensorimotor neuropathyHPOHP:0007141
- Frequent (30% to 79% of cases)
- Sensory neuropathyHPOHP:0000763
- Frequent (30% to 79% of cases)
- Spastic dysarthriaHPOHP:0002464
- Frequent (30% to 79% of cases)
- Spinocerebellar atrophyHPOHP:0007263
- 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.
- PEX6HGNC:8859
- Definitive · G2P · Autosomal recessive · 2017
- Supportive · Orphanet · Autosomal recessive · 2021
Where it sits
Other names
9 names
Resolves to: peroxisome biogenesis disorder 4B
- Also called
- autosomal recessive cerebellar ataxia-blindness-deafness syndromeautosomal recessive spinocerebellar ataxia type 3autosomal recessive spinocerebellar ataxia-blindness-hearing loss syndromePBD4Bperoxisome biogenesis disorder type 4BSCABDSCAR3spinocerebellar ataxia autosomal recessive 3spinocerebellar ataxia, autosomal recessive 3