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Features include always present findings: Frequent falls, Brisk reflexes, Intellectual disability, and Difficulty walking (gait disturbance); and common findings: Clonus, Low muscle tone (hypotonia), Lingual dystonia, and Motor tics and others. 22 total HPO annotations.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Brain and nerves | 9 | Clonus, Lingual dystonia, Headache |
Phenotype severity distribution: 4 always present features, 15 common features.
No clinical trials have been registered for striatonigral degeneration, infantile, mitochondrial.
2 publications have been identified in PubMed for striatonigral degeneration, infantile, mitochondrial. Research spans Review / Meta-Analysis (100%).
Calakos N (2025). [PMID: 39467044](https://pubmed.ncbi.nlm.nih.gov/39467044/). *Movement disorders : official journal of the Movement Disorder Society*. [Review / Meta-Analysis]
Pathak S (2024). [PMID: 38876946](https://pubmed.ncbi.nlm.nih.gov/38876946/). *Journal of Ayurveda and integrative medicine*. [Review / Meta-Analysis]
Data assembled from 4 of 12 sources · Last updated Sep 18, 2026, 8:35 PM UTC
Online Mendelian Inheritance in Man
Genetic and Rare Diseases Info Center
Muscles |
3 |
Low muscle tone (hypotonia), Frequent falls, Ragged-red muscle fibers |
Head and neck | 2 | Facial grimacing, Mild microcephaly |
Lab test results | 1 | Increased circulating lactate concentration |
Age of onset: childhood.