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A basal ganglia disorder characterized by Parkinsonian-type symptoms (postural changes, tremor, rigidity), megalencephaly and variable intellectual deficit. Other signs are frontal bossing, persistent frontal lobe reflexes, strabismus and seizures. It has been described in three generations of one family. Transmission is X-linked, and the gene is located on chromosomal region Xq27.3-qter.
Features include always present findings: Slowness of movement (bradykinesia), Parkinsonism, Muscle stiffness (rigidity), and Parkinsonism with favorable response to dopaminergic medication; and very common findings: Resting tremor. 19 total HPO annotations.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Brain and nerves | 14 | Poor speech, Resting tremor, Slowness of movement (bradykinesia) |
Bones and joints | 1 | Postural instability |
Head and neck | 1 | Macrocephaly |
RAB39B function has not been fully characterized.
Early-onset parkinsonism-intellectual disability syndrome is caused by mutations in the RAB39B gene on chromosome X.
Genetic testing for RAB39B is available. Testing is considered confirmatory for diagnosis.
Biomarker and diagnostic research for early-onset parkinsonism-intellectual disability syndrome has been reported in the published literature.
Phenotype severity distribution: 4 always present features, 1 very common feature, 1 common feature.
Estimated prevalence: <1 in 1,000,000 (VERY_RARE).
No clinical trials have been registered for early-onset parkinsonism-intellectual disability syndrome.
141 publications have been identified in PubMed for early-onset parkinsonism-intellectual disability syndrome. Kisho has analyzed 84 by research type. Research spans Review / Meta-Analysis (29%), Case Report / Case Series (26%), and Basic Science / Preclinical (21%).
Research Type | Count | % of Total |
|---|---|---|
Research summaries | 24 | 29% |
Patient case studies | 22 | 26% |
Laboratory research | 18 | 21% |
Disease patterns and progression | 12 | 14% |
Testing and diagnosis research | 5 | 6% |
New treatment approaches | 2 | 2% |
Other research | 1 | 1% |
Dudley AM (2026). [PMID: 41136202](https://pubmed.ncbi.nlm.nih.gov/41136202/). *Pract Neurol*. [Review / Meta-Analysis]
Pedullà G (2026). [PMID: 41722179](https://pubmed.ncbi.nlm.nih.gov/41722179/). *Parkinsonism Relat Disord*. [Case Report / Case Series]
Muhammad A (2026). [PMID: 42046183](https://pubmed.ncbi.nlm.nih.gov/42046183/). *Mol Genet Genomic Med*. [Review / Meta-Analysis]
Millevert C (2026). [PMID: 40472023](https://pubmed.ncbi.nlm.nih.gov/40472023/). *Brain*. [Case Report / Case Series]
Caputo D (2026). [PMID: 41133379](https://pubmed.ncbi.nlm.nih.gov/41133379/). *Epilepsia*. [Epidemiology / Natural History]
Baldin S (2026). [PMID: 40847610](https://pubmed.ncbi.nlm.nih.gov/40847610/). *FEBS J*. [Basic Science / Preclinical]
Hoang HD (2026). [PMID: 41467504](https://pubmed.ncbi.nlm.nih.gov/41467504/). *Hum Mol Genet*. [Case Report / Case Series]
Zhang K (2026). [PMID: 41591480](https://pubmed.ncbi.nlm.nih.gov/41591480/). *Acta Diabetol*. [Case Report / Case Series]
Del Regno C (2026). [PMID: 41074240](https://pubmed.ncbi.nlm.nih.gov/41074240/). *Ann Clin Transl Neurol*. [Case Report / Case Series]
Akhila P (2026). [PMID: 41611321](https://pubmed.ncbi.nlm.nih.gov/41611321/). *BMJ Case Rep*. [Case Report / Case Series]
Data assembled from 7 of 12 sources · Last updated Sep 19, 2026, 12:41 AM UTC
Online Mendelian Inheritance in Man
European rare disease database
Genetic and Rare Diseases Info Center