α-Synuclein modifies huntingtin aggregation in living cells

Area of Science:

• Neurobiology
• Molecular Biology
• Biochemistry

Background:

• Neurodegenerative diseases, including Huntington's disease (HD) and Parkinson's disease (PD), are linked to protein aggregation in the central nervous system.
• These protein aggregates often comprise multiple aggregation-prone proteins, suggesting complex interactions contribute to disease pathology.

Purpose of the Study:

• To investigate the initial co-aggregation steps between huntingtin (Htt) and alpha-synuclein (α-syn).
• To understand how these proteins interact and influence each other's aggregation behavior.

Main Methods:

• Utilized a bimolecular fluorescence complementation (BiFC) assay.
• Studied the co-aggregation of Htt (exon 1) and α-syn in a cellular context.

Main Results:

• Demonstrated that Htt (exon 1) oligomerizes with α-syn and sequesters it in the cytosol.
• Observed that α-syn influences Htt aggregation by increasing the number of cells with aggregates, reducing aggregate count per cell, and enlarging aggregate size.

Conclusions:

• Co-aggregation of aggregation-prone proteins like Htt and α-syn is a significant factor in the histopathology of neurodegenerative disorders.
• These protein interactions may represent a common mechanism underlying various neurodegenerative conditions.