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Features include always present findings: Hypsarrhythmia, Seizure, Feeding difficulties in infancy, and Absent speech and others; and common findings: Prolonged neonatal jaundice. 32 total HPO annotations.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Brain and nerves | 10 | Seizure, Cerebral cortical atrophy, Cerebral visual impairment |
PARS2 function has not been fully characterized.
Developmental and epileptic encephalopathy, 75 is associated with mutations in the PARS2 gene on chromosome 1.
Genetic testing for PARS2 is available. Testing is considered confirmatory for diagnosis.
Biomarker and diagnostic research for developmental and epileptic encephalopathy, 75 has been reported in the published literature.
Phenotype severity distribution: 6 always present features, 1 common feature.
No clinical trials have been registered for developmental and epileptic encephalopathy, 75.
91 publications have been identified in PubMed for developmental and epileptic encephalopathy, 75. Research spans Epidemiology / Natural History (36%), Clinical Trial Publication (19%), and Review / Meta-Analysis (13%).
Research Type | Count | % of Total |
|---|---|---|
Disease patterns and progression | 32 | 36% |
Data assembled from 5 of 12 sources · Last updated Sep 19, 2026, 2:56 PM UTC
Online Mendelian Inheritance in Man
Genetic and Rare Diseases Info Center
Muscles
4 |
Cerebral cortical atrophy, Axial hypotonia, Frontal cortical atrophy |
Digestive system | 3 | Decreased liver function, Feeding difficulties in infancy, Prolonged neonatal jaundice |
Eyes | 3 | Cerebral visual impairment, Damage to the optic nerve (optic atrophy), Optic disc pallor |
Pregnancy and birth | 1 | Prolonged neonatal jaundice |
Head and neck | 1 | Secondary microcephaly |
Heart and blood vessels | 1 | Heart muscle disease (cardiomyopathy) |
Age of onset: newborn period, infancy.
Clinical study results |
17 |
19% |
Research summaries | 12 | 13% |
Testing and diagnosis research | 8 | 9% |
Patient case studies | 8 | 9% |
Laboratory research | 7 | 8% |
New treatment approaches | 6 | 7% |
Makaram N (2026). [PMID: 40974546](https://pubmed.ncbi.nlm.nih.gov/40974546/). *Epilepsia*. [Clinical Trial Publication]
Jonsson M (2026). [PMID: 40617904](https://pubmed.ncbi.nlm.nih.gov/40617904/). *Pediatr Res*. [Epidemiology / Natural History]
Laux L (2026). [PMID: 41780062](https://pubmed.ncbi.nlm.nih.gov/41780062/). *N Engl J Med*. [Clinical Trial Publication]
Huang C (2026). [PMID: 41622135](https://pubmed.ncbi.nlm.nih.gov/41622135/). *BMC Neurol*. [Case Report / Case Series]
Philliben RF (2026). [PMID: 40657899](https://pubmed.ncbi.nlm.nih.gov/40657899/). *J Clin Neurophysiol*. [Case Report / Case Series]
Soto-Insuga V (2026). [PMID: 42044942](https://pubmed.ncbi.nlm.nih.gov/42044942/). *Neurologia (Engl Ed)*. [Gene Therapy / Novel Therapeutics]
Wan L (2026). [PMID: 41797007](https://pubmed.ncbi.nlm.nih.gov/41797007/). *Seizure*. [Clinical Trial Publication]
Cross JH (2026). [PMID: 41848774](https://pubmed.ncbi.nlm.nih.gov/41848774/). *Epilepsia Open*. [Review / Meta-Analysis]
Briscoe C (2026). [PMID: 41172580](https://pubmed.ncbi.nlm.nih.gov/41172580/). *Pediatr Neurol*. [Review / Meta-Analysis]
Sakpichaisakul K (2026). [PMID: 41529348](https://pubmed.ncbi.nlm.nih.gov/41529348/). *Pediatr Neurol*. [Clinical Trial Publication]