Reference LINE-1 insertion polymorphisms correlate with Parkinson's disease progression and differential transcript...

Area of Science:

• Genomics
• Neuroscience
• Molecular Biology

Background:

• Long interspersed nuclear element-1 (LINE-1) retrotransposons constitute 17% of the human genome.
• LINE-1 elements can mobilize autonomously and influence other transposable elements like Alu and SVA.
• Population-level variations exist for the presence or absence of LINE-1 elements due to their polymorphic nature.

Purpose of the Study:

• To investigate the impact of LINE-1 insertion polymorphism on genome-wide gene expression.
• To determine the association between LINE-1 insertion polymorphism and the progression of Parkinson's disease (PD).
• To analyze the role of LINE-1 elements in regulating gene expression and PD progression using clinical and transcriptomic data.

Main Methods:

• Utilized matrix expression quantitative trait loci (eQTL) analysis.
• Applied linear mixed-effects models to 114 clinical, biochemical, and imaging data points from the Parkinson's Progression Markers Initiative (PPMI) cohort.
• Combined clinical and transcriptomic data from the PPMI.

Main Results:

• Demonstrated that most LINE-1 insertion polymorphisms regulate gene expression, predominantly in trans, including known PD risk loci.
• Identified 70 LINE-1 elements associated with longitudinal changes in PD progression markers.
• Observed associations with markers such as ipsilateral count density ratio and UPDRS scores, indicating degeneration and severity.

Conclusions:

• The polymorphic nature of LINE-1 retrotransposons significantly affects gene regulation.
• LINE-1 insertion polymorphisms are linked to the progression of Parkinson's disease.
• Transposable element analysis is crucial for understanding complex diseases like PD.