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Parkinson's disease in twins
P Vieregge1, K A Schiffke, H J Friedrich
1Department of Neurology, Medizinische Universität zu Lübeck, Germany.
Abstract:
Among nine monozygotic (MZ) and 12 dizygotic (DZ) twin pairs in which an index case had typical Parkinson's disease (PD) or PD with associated dementia, three MZ and three DZ pairs were concordant. Three of the six affected co-twins were first diagnosed during the study. Occurrence of PD in families of MZ and DZ index cases was more frequent than expected from population rates. The study underlines the need for personal examination using defined criteria in a cross-sectional twin study on PD. Although the study did not establish a major genetic impact in the etiology of PD, a genetic predisposition for the disease cannot be ruled out for some individuals.
Insights
This Parkinson's disease (PD) twin study found some concordance in both identical (monozygotic) and fraternal (dizygotic) twins. While not proving major genetic impact, it suggests a possible genetic predisposition for PD.
Area of Science:
- Neurology
- Genetics
- Epidemiology
Background:
- Parkinson's disease (PD) is a neurodegenerative disorder with complex etiology.
- Twin studies are valuable for investigating the genetic and environmental contributions to diseases.
Purpose of the Study:
- To investigate the concordance rates of Parkinson's disease in monozygotic (MZ) and dizygotic (DZ) twin pairs.
- To explore the familial occurrence of PD in relation to twin zygosity.
Main Methods:
- Cross-sectional study design.
- Inclusion of nine MZ and 12 DZ twin pairs with an index case of typical PD or PD with dementia.
- Personal examination of participants using defined diagnostic criteria.
Main Results:
- Concordance was observed in three MZ and three DZ pairs.
- Three affected co-twins received their initial diagnosis during the study.
- Familial PD occurrence exceeded population expectations in both MZ and DZ index cases.
Conclusions:
- The study highlights the necessity of direct clinical assessment in twin studies for PD.
- A significant genetic impact on PD etiology was not established, but a genetic predisposition remains a possibility for certain individuals.