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We investigated how \u03b1-synuclein affects neuronal activity before cell death using two mouse models: \u03b1-synuclein preformed fibril injections and AAV-mediated human \u03b1-synuclein expression. Four-weeks post-injection, histological analysis confirmed no significant neuronal loss in either structure, providing a temporal window to study neuronal activity before cell death. Electrophysiological recordings revealed region-specific vulnerability: SNc dopamine neurons exhibited significantly increased baseline firing rates while VTA neurons remained unaffected. SNc neurons showed impaired homeostatic firing regulation following hyperpolarization, while VTA neurons maintained normal recovery. Elevated \u03b1-synuclein also altered network stability in SNc dopamine neurons before cell death, while sparing VTA neurons. These findings reveal early functional differences that may explain the selective vulnerability of SNc dopamine neurons in PD.<\/jats:p>","DOI":"10.1038\/s41531-025-01055-3","type":"journal-article","created":{"date-parts":[[2025,7,11]],"date-time":"2025-07-11T07:21:05Z","timestamp":1752218465000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Parkinson\u2019s paradox: alpha-synuclein\u2019s selective strike on SNc dopamine neurons over VTA"],"prefix":"10.1038","volume":"11","author":[{"given":"L.","family":"Phan","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"D.","family":"Miller","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"A.","family":"Gopinath","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M.","family":"Lin","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"E. 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