Early-onset Parkinson disease 20: genes and variants

Early-onset Parkinson disease 20 is linked to 1 analyzed protein (SYNJ1). 3 DNA variants are known to cause it; 2 more are uncertain, and 0 of those already look disease-causing on computable evidence.

Last updated 2026-09-30. Research information, not medical advice.

Genes linked to Early-onset Parkinson disease 20

Known disease-causing variants in Early-onset Parkinson disease 20

VariantPositionProtein partClinical label
SYNJ1 R219Q219SACDisease-causing (★★★★)
SYNJ1 R800C8005-PPaseDisease-causing (★)
SYNJ1 R420P420SACDisease-causing

Diseases related to Early-onset Parkinson disease 20

Frequently asked questions

Which genes are linked to Early-onset Parkinson disease 20?

In CATVariant, Early-onset Parkinson disease 20 is linked to 1 analyzed protein: SYNJ1 (Polyphosphatidylinositol phosphatase SYNJ1).

How many genetic variants are linked to Early-onset Parkinson disease 20?

7 variants: 3 are classified as disease-causing (pathogenic or likely pathogenic) in ClinVar and 2 are of uncertain significance or have conflicting reports.

Which uncertain variants in Early-onset Parkinson disease 20 look disease-causing?

None of the uncertain variants currently reaches the likely-pathogenic range on computable evidence alone.

About this data

Variant–disease links come from ClinVar, Open Targets and UniProt, pooled from the latest public CATVariant analysis of each human protein. Evidence scores use the ACMG/AMP Bayesian points scale with computable criteria only (position among known disease variants, rarity in gnomAD, calibrated predictors, deep mutational scanning); there is no family or patient data, so they prioritise variants for expert review and never classify them.

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