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A group of disorders which feature impaired motor control characterized by bradykinesia, muscle rigidity; tremor; and postural instability. Parkinsonian diseases are generally divided into primary parkinsonism (see Parkinson disease), secondary parkinsonism (see Parkinson disease, secondary) and inherited forms. These conditions are associated with dysfunction of dopaminergic or closely related motor integration neuronal pathways in the basal ganglia.
Features include always present findings: Slowness of movement (bradykinesia), Pill-rolling tremor, Overactive reflexes (hyperreflexia), and Reduced movement (hypokinesia) and others; and very common findings: Muscle stiffness (rigidity) and Tremor. 22 total HPO annotations.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Brain and nerves | 19 | Resting tremor, Slowness of movement (bradykinesia), Dystonia |
Muscles | 2 | Brain shrinkage (cerebral atrophy), Loss of ambulation |
Bones and joints | 2 | Postural tremor, Postural instability |
Parkin type of early-onset Parkinson disease (PARK-Parkin) is characterized by the cardinal signs of Parkinson disease (PD): bradykinesia, resting tremor, and rigidity. The median age at onset is 31 years (range: 3-81 years). The disease is slowly progressive and disease duration of more than 50 years has been reported. Clinical findings vary; hyperreflexia is common. Lower-limb dystonia may be a presenting sign and cognitive decline appears to be no more frequent than in the normal population. Dyskinesia as a result of treatment with dopaminergic drugs frequently occurs. Women and men are affected with equal frequency.
Source: GeneReviews — "Parkin Type of Early-Onset Parkinson Disease"
PRKN function has not been fully characterized.
Autosomal recessive juvenile Parkinson disease 2 is associated with mutations in the PRKN gene on chromosome 6.
No clear-cut genotype-phenotype correlations have been observed.
Source: GeneReviews — "Parkin Type of Early-Onset Parkinson Disease"
Parkin type of early-onset Parkinson disease (PARK-Parkin) should be suspected in individuals with the following clinical findings and family history.
Clinical findings
Onset before age 40 years in most individuals (median age: 31 years; range: 3-81 years) or, rarely, juvenile onset (age 20 years).
Lower-limb dystonia (may be a presenting sign or may occur during disease progression), which sometimes remains an isolated finding for years
Slow disease progression
Absence of dementia in most individuals (present in 3%)
Well-preserved sense of smell
Marked and sustained response to oral administration of levodopa, which is frequently associated with levodopa-induced motor fluctuations and dyskinesias (abnormal involuntary movements)
Source: GeneReviews — "Parkin Type of Early-Onset Parkinson Disease"
Early-Onset Parkinson Disease Parkin type of early-onset Parkinson disease (PARK-Parkin) is often clinically indistinguishable from Parkinson disease of other etiologies (see Parkinson Disease Overview). Rigidity, bradykinesia, and resting tremor are variably combined in both disorders. PARK-Parkin and early-onset Parkinson disease of other etiologies are difficult to distinguish by clinical examination. Table 3. Genes Associated with Early-Onset Autosomal Recessive Parkinson Disease in the Differential Diagnosis of PARK-Parkin
Gene | PD Designation1 | Median Age at Onset(Range)2 | # of Persons w/Clinical Information in the Literature2 | Comment |
|---|---|---|---|---|
PARK-PINK1 | 32 yrs(9-67) |
Genetic testing for PRKN is available. Testing is considered confirmatory for diagnosis.
Biomarker and diagnostic research for autosomal recessive juvenile Parkinson disease 2 has been reported in the published literature.
No approved treatments are currently available for autosomal recessive juvenile Parkinson disease 2. The disease remains an area of unmet medical need.
To establish the extent of disease and needs in an individual diagnosed with Parkin type early-onset Parkinson disease (PARK-Parkin), the following evaluations (if not performed as part of the evaluation that led to the diagnosis) are recommended:
Assess the presence and the severity of parkinsonian signs, non-motor features, and treatment-related complications using the Unified Parkinson's disease rating scale (UPDRS) or the Movement Disorder Society (MDS) UPDRS .
Assess the presence of atypical signs, such as hyperreflexia and dystonia.
Evaluate the degree of response to treatment.
Assess for cognitive or behavioral problems.
Consider consultation with a clinical geneticist and/or genetic counselor.
To date, the treatment of PARK-Parkin does not differ from that of Parkinson disease of other etiologies. No specific guidelines are currently available.
The motor impairment usually responds very well to low doses of dopaminergic medication; the response is typically sustained even after long disease duration. To reduce or delay side effects, levodopa doses should not exceed the levels required for satisfactory clinical response.
On average, the response to low doses of levodopa is excellent and sustained. The likelihood of developing levodopa-induced dyskinesias is higher than in individuals with parkinsonism resulting from other etiologies.
Source: GeneReviews — "Parkin Type of Early-Onset Parkinson Disease"
Neuroleptic treatment may exacerbate parkinsonism.
Source: GeneReviews — "Parkin Type of Early-Onset Parkinson Disease"
PRKN variants result in impaired mitochondrial function and clearance of dysfunctional mitochondria. Thus, individuals PARK-Parkin may preferentially benefit from mitochondrial enhancers that are currently being tested in clinical trial in a gene-targeted fashion . Search ClinicalTrials.gov in the US and EU Clinical Trials Register in Europe for access to information on clinical studies for a wide range of diseases and conditions.
Source: GeneReviews — "Parkin Type of Early-Onset Parkinson Disease"
View trials for autosomal recessive juvenile Parkinson disease 2
Neurologic follow up every six to 12 months to modify treatment as needed is appropriate.
Source: GeneReviews — "Parkin Type of Early-Onset Parkinson Disease"
Phenotype severity distribution: 7 always present features, 2 very common features, 9 common features.
No clinical trials have been registered for autosomal recessive juvenile Parkinson disease 2.
330 publications have been identified in PubMed for autosomal recessive juvenile Parkinson disease 2. Kisho has analyzed 256 by research type. Research spans Basic Science / Preclinical (48%), Review / Meta-Analysis (15%), and Epidemiology / Natural History (14%).
Research Type | Count | % of Total |
|---|---|---|
Laboratory research | 124 | 48% |
Research summaries | 39 | 15% |
Disease patterns and progression | 37 | 14% |
Testing and diagnosis research | 19 | 7% |
Clinical study results | 19 | 7% |
New treatment approaches | 14 | 5% |
Patient case studies | 4 | 2% |
Pan LY (2026). [PMID: 42204920](https://pubmed.ncbi.nlm.nih.gov/42204920/). *Brain Behav*. [Basic Science / Preclinical]
Benacom D (2026). [PMID: 40501146](https://pubmed.ncbi.nlm.nih.gov/40501146/). *Brain*. [Basic Science / Preclinical]
Ledingham D (2026). [PMID: 41388605](https://pubmed.ncbi.nlm.nih.gov/41388605/). *Ann Clin Transl Neurol*. [Diagnostic / Biomarker]
Jiao S (2026). [PMID: 41115486](https://pubmed.ncbi.nlm.nih.gov/41115486/). *Journal of ethnopharmacology*. [Gene Therapy / Novel Therapeutics]
Jalles C (2026). [PMID: 41875706](https://pubmed.ncbi.nlm.nih.gov/41875706/). *Parkinsonism Relat Disord*. [Basic Science / Preclinical]
García-Yagüe AJ (2026). [PMID: 41539374](https://pubmed.ncbi.nlm.nih.gov/41539374/). *Free radical biology & medicine*. [Basic Science / Preclinical]
Lee YH (2026). [PMID: 40300576](https://pubmed.ncbi.nlm.nih.gov/40300576/). *Neuroepidemiology*. [Review / Meta-Analysis]
Farsana MK (2026). [PMID: 40829774](https://pubmed.ncbi.nlm.nih.gov/40829774/). *Journal of movement disorders*. [Epidemiology / Natural History]
Liu R (2026). [PMID: 41818739](https://pubmed.ncbi.nlm.nih.gov/41818739/). *Journal of medical Internet research*. [Basic Science / Preclinical]
Duan J (2026). [PMID: 41609041](https://pubmed.ncbi.nlm.nih.gov/41609041/). *J Integr Neurosci*. [Basic Science / Preclinical]
Data assembled from 6 of 12 sources · Last updated Sep 20, 2026, 2:37 PM UTC
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Online Mendelian Inheritance in Man
Genetic and Rare Diseases Info Center
2nd most common cause of EOPD, after PRKN; PARK-PINK1 Parkin type EOPD are clinically indistinguishable.; Non-motor manifestations incl psychiatric features may be more common.; Heterozygotes may have risk for PD. |
— |
DJ-1 | PARK-DJ1 (OMIM 606324) | 27 yrs(15-40) | 33 | Phenotype similar to PARK-Parkin; IDD /or seizures occasionally; Risk to heterozygotes unknown DNAJC6 |
PARK-DNAJC6 | 11 yrs (7-42) | 11 | Pyramidal signs; IDD / early cognitive impairment; Early vivid hallucinations on intake of dopamine agonists; Early falls; Saccadic abnormalities; Pyramidal signs | — |
FBXO7 | PARK-FBXO7 (OMIM 260300) | 17 yrs(10-52) | 27 | IDD / early cognitive impairment; Early vivid hallucinations behavioral abnormalities on intake of dopamine agonists; Early falls; Saccadic abnormalities; Gaze palsy; Oculogyric spasms; Pyramidal signs; Autonomic dysfunction |
SYNJ1 | PARK-SYNJ1 (OMIM 615530) | 21 yrs(12-31) | 15 | Early cognitive impairment; Early falls; Saccadic abnormalities; Gaze palsy; Pyramidal signs; Ataxia; Autonomic dysfunction |
VPS13C | PARK-VPS13C (OMIM 616840) | 29 yrs(0-70) | 4 | Early cognitive impairment; Early falls; Pyramidal signs; Autonomic dysfunction EOPD = early-onset Parkinson disease; IDD = intellectual developmental disorder 1. Nomenclature based on 2. Data from www.MDSGene. |
Source: GeneReviews — "Parkin Type of Early-Onset Parkinson Disease"
AI-curated news mentioning autosomal recessive juvenile Parkinson disease 2
Updated Aug 5, 2026
A recent study highlights the significant symptom burden and treatment challenges faced by patients with juvenile Parkinson's disease. The findings underscore the need for targeted research and improved therapeutic strategies for this rare condition.