Pathological α-Synuclein Perturbs Nuclear Integrity

Area of Science:

• Neuroscience
• Cell Biology
• Molecular Biology

Background:

• Alpha-synuclein aggregates are key in synucleinopathies.
• Its role in nuclear function remains controversial and poorly understood.
• Existing research focuses on synaptic roles, neglecting nuclear implications.

Purpose of the Study:

• To investigate the nuclear localization of pathological alpha-synuclein.
• To determine the consequences of nuclear alpha-synuclein accumulation on nuclear integrity.
• To explore the mechanistic impact on DNA damage, nuclear envelope, and RNA localization.

Main Methods:

• Utilized synucleinopathy mouse and cell culture models.
• Examined postmortem human Lewy Body Dementia brain tissue.
• Employed quantitative super-resolution microscopy and molecular markers for DNA damage and nuclear envelope integrity.

Main Results:

• Observed pathological alpha-synuclein aggregation within the nucleus in mouse models and human LBD cortex.
• Nuclear alpha-synuclein correlated with abnormal nuclear morphology and increased DNA damage (53BP1).
• Detected elevated nuclear envelope damage markers, altered repair marker expression, and changed RNA localization.

Conclusions:

• Rigorously demonstrated nuclear localization of pathological alpha-synuclein using super-resolution microscopy.
• Provided novel insights into the impact of nuclear alpha-synuclein on nuclear integrity and function.
• Highlighted potential mechanisms linking nuclear pathology to disease progression in synucleinopathies.