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Features include common findings: Seizure, Low muscle tone (hypotonia), Increased circulating very long-chain fatty acid concentration, and Elevated circulating aspartate aminotransferase concentration and others; and sometimes findings: Epicanthus, Lethargy, Hearing loss (hearing impairment), and Elevated circulating alkaline phosphatase concentration and others. 81 total HPO annotations.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Lab test results | 7 |
PEX2 function has not been fully characterized.
Peroxisome biogenesis disorder 5A (Zellweger) is associated with mutations in the PEX2 gene on chromosome 8.
Genetic testing for PEX2 is available. Testing is considered confirmatory for diagnosis.
Phenotype severity distribution: 12 common features.
No clinical trials have been registered for peroxisome biogenesis disorder 5A (Zellweger).
3 publications have been identified in PubMed for peroxisome biogenesis disorder 5A (Zellweger). Research spans Basic Science / Preclinical (100%).
Correia J (2026). [PMID: 40632619](https://pubmed.ncbi.nlm.nih.gov/40632619/). *The journals of gerontology. Series A, Biological sciences and medical sciences*. [Basic Science / Preclinical]
Amin S (2025). [PMID: 40552310](https://pubmed.ncbi.nlm.nih.gov/40552310/). *Frontiers in cell and developmental biology*. [Basic Science / Preclinical]
Gomez VA (2025). [PMID: 40621817](https://pubmed.ncbi.nlm.nih.gov/40621817/). *Disease models & mechanisms*. [Basic Science / Preclinical]
Data assembled from 5 of 12 sources · Last updated Sep 19, 2026, 12:33 AM UTC
Online Mendelian Inheritance in Man
Genetic and Rare Diseases Info Center
Digestive system | 7 | Intrahepatic biliary dysgenesis, Jaundice, Cholestasis |
Eyes | 6 | Opacification of the corneal stroma, Optic nerve dysplasia, Cataract |
Heart and blood vessels | 5 | Heart murmur, Aortic regurgitation, Mitral regurgitation |
Brain and nerves | 4 | Seizure, Intellectual disability, Generalized-onset seizure |
Muscles | 4 | Low muscle tone (hypotonia), Damage to the optic nerve (optic atrophy), Shrinkage of the cerebellum (cerebellar atrophy) |
Head and neck | 4 | Round face, Cleft palate, Flat face |
Kidneys and urinary system | 3 | Polycystic kidney dysplasia, Renal cortical microcysts, Renal cyst |
Ears | 2 | Hearing loss (hearing impairment), Inner ear hearing loss (sensorineural hearing impairment) |
Growth and development | 2 | Failure to thrive, Intrauterine growth retardation |
Skin | 1 | Small nail |
Pregnancy and birth | 1 | Fetal distress |
Blood and immune system | 1 | Enlarged spleen (splenomegaly) |