Differential role of C-terminal truncations on alpha-synuclein pathology and Lewy body formation
(2025) In npj Parkinson's Disease 11(1).- Abstract
Alpha-synuclein (aSyn) post-translational modifications (PTM), especially phosphorylation at serine 129 and C-terminal truncations, are highly enriched in Lewy bodies (LB), Lewy neurites, and other pathological aggregates in Parkinson’s disease and synucleinopathies. However, the precise role of these PTM in pathology formation, neurodegeneration, and pathology spreading remains unclear. Here, we systematically investigated the role of post-fibrillization C-terminal aSyn truncations in regulating uptake, processing, seeding, and LB-like inclusion formation using a neuronal seeding model that recapitulates LB formation and neurodegeneration. We show that C-terminal cleavage of aSyn fibrils occurs rapidly post exogenous fibril... (More)
Alpha-synuclein (aSyn) post-translational modifications (PTM), especially phosphorylation at serine 129 and C-terminal truncations, are highly enriched in Lewy bodies (LB), Lewy neurites, and other pathological aggregates in Parkinson’s disease and synucleinopathies. However, the precise role of these PTM in pathology formation, neurodegeneration, and pathology spreading remains unclear. Here, we systematically investigated the role of post-fibrillization C-terminal aSyn truncations in regulating uptake, processing, seeding, and LB-like inclusion formation using a neuronal seeding model that recapitulates LB formation and neurodegeneration. We show that C-terminal cleavage of aSyn fibrils occurs rapidly post exogenous fibril internalization and during intracellular LB-like inclusion formation. Blocking cleavage of internalized fibrils does not affect seeding, but inhibiting enzymes such as calpains 1 and 2 alters LB-like inclusion formation. We show that C-terminal truncations, along with other PTMs, regulate fibril interactome remodeling, shortening, lateral association, and packing. These findings reveal distinct roles of C-terminal truncations at different aggregation stages on the pathway to LB formation, highlighting the need for consideration of stage‑specific strategies to target aSyn proteolytic cleavages.
(Less)
- author
- organization
- publishing date
- 2025-12
- type
- Contribution to journal
- publication status
- published
- subject
- in
- npj Parkinson's Disease
- volume
- 11
- issue
- 1
- article number
- 261
- publisher
- Springer Nature
- external identifiers
-
- pmid:40858624
- scopus:105014618209
- ISSN
- 2373-8057
- DOI
- 10.1038/s41531-025-01084-y
- language
- English
- LU publication?
- yes
- id
- c3c062c6-a021-4a4a-8f62-56dc33100683
- date added to LUP
- 2025-10-03 08:57:49
- date last changed
- 2025-10-04 03:00:07
@article{c3c062c6-a021-4a4a-8f62-56dc33100683, abstract = {{<p>Alpha-synuclein (aSyn) post-translational modifications (PTM), especially phosphorylation at serine 129 and C-terminal truncations, are highly enriched in Lewy bodies (LB), Lewy neurites, and other pathological aggregates in Parkinson’s disease and synucleinopathies. However, the precise role of these PTM in pathology formation, neurodegeneration, and pathology spreading remains unclear. Here, we systematically investigated the role of post-fibrillization C-terminal aSyn truncations in regulating uptake, processing, seeding, and LB-like inclusion formation using a neuronal seeding model that recapitulates LB formation and neurodegeneration. We show that C-terminal cleavage of aSyn fibrils occurs rapidly post exogenous fibril internalization and during intracellular LB-like inclusion formation. Blocking cleavage of internalized fibrils does not affect seeding, but inhibiting enzymes such as calpains 1 and 2 alters LB-like inclusion formation. We show that C-terminal truncations, along with other PTMs, regulate fibril interactome remodeling, shortening, lateral association, and packing. These findings reveal distinct roles of C-terminal truncations at different aggregation stages on the pathway to LB formation, highlighting the need for consideration of stage‑specific strategies to target aSyn proteolytic cleavages.</p>}}, author = {{Mahul-Mellier, Anne Laure and Altay, Melek Firat and Maharjan, Niran and Ait-Bouziad, Nadine and Chiki, Anass and Jagannath, Somanath and Limorenko, Galina and Novello, Salvatore and Ricci, Jonathan and Jasiqi, Yllza and Vingill, Siv and Wade-Martins, Richard and Holton, Janice and Strand, Catherine and Haikal, Caroline and Li, Jia Yi and Hamelin, Romain and Croisier, Marie and Knott, Graham and Mairet-Coello, Georges and Weerens, Laura and Michel, Anne and Downey, Patrick and Citron, Martin and Lashuel, Hilal A.}}, issn = {{2373-8057}}, language = {{eng}}, number = {{1}}, publisher = {{Springer Nature}}, series = {{npj Parkinson's Disease}}, title = {{Differential role of C-terminal truncations on alpha-synuclein pathology and Lewy body formation}}, url = {{http://dx.doi.org/10.1038/s41531-025-01084-y}}, doi = {{10.1038/s41531-025-01084-y}}, volume = {{11}}, year = {{2025}}, }