RT-QuIC Using C-Terminally Truncated α-Synuclein Forms Detects Differences in Seeding Propensity of Different Brain Regions from Synucleinopathies
Aggregated α-synuclein (αSyn) protein is a core pathological feature of Parkinson’s disease (PD) and dementia with Lewy bodies (DLB). Both PD and DLB demonstrate the presence of diverse intracellular α-synuclein (αSyn) species, including C-terminally truncated αSyn (C-αSyn), although it is unknown h...
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doaj-3aef1def0d27483e8c7d9ec67aa016d92021-06-01T01:46:02ZengMDPI AGBiomolecules2218-273X2021-05-011182082010.3390/biom11060820RT-QuIC Using C-Terminally Truncated α-Synuclein Forms Detects Differences in Seeding Propensity of Different Brain Regions from SynucleinopathiesIlaria Poggiolini0Daniel Erskine1Nishant N. Vaikath2Janarthanan Ponraj3Said Mansour4Christopher M. Morris5Omar M. A. El-Agnaf6Neurological Disorder Research Center, Qatar Biomedical Research Institute (QBRI), Hamad Bin Khalifa University (HBKU), Qatar Foundation, Doha 974, QatarTranslational and Clinical Research Institute, Newcastle University, Newcastle upon Tyne NE2 4AA, UKNeurological Disorder Research Center, Qatar Biomedical Research Institute (QBRI), Hamad Bin Khalifa University (HBKU), Qatar Foundation, Doha 974, QatarCore Labs, Qatar Environment and Energy Research Institute (QEERI), Hamad Bin Khalifa University (HBKU), Qatar Foundation, Doha 974, QatarCore Labs, Qatar Environment and Energy Research Institute (QEERI), Hamad Bin Khalifa University (HBKU), Qatar Foundation, Doha 974, QatarNewcastle Brain Tissue Resource, Translational and Clinical Research Institute, Campus for Ageing and Vitality, Newcastle University, Newcastle upon Tyne NE4 5PL, UKNeurological Disorder Research Center, Qatar Biomedical Research Institute (QBRI), Hamad Bin Khalifa University (HBKU), Qatar Foundation, Doha 974, QatarAggregated α-synuclein (αSyn) protein is a core pathological feature of Parkinson’s disease (PD) and dementia with Lewy bodies (DLB). Both PD and DLB demonstrate the presence of diverse intracellular α-synuclein (αSyn) species, including C-terminally truncated αSyn (C-αSyn), although it is unknown how C-αSyn species contribute to disease progression. Using recombinant C-αSyn and PD and DLB brain lysates as seeds in the real-time quaking-induced conversion (RT-QuIC) assay, we explored how C-αSyn may be involved in disease stratification. Comparing the seeding activity of aqueous-soluble fractions to detergent-soluble fractions, and using αSyn 1-130 as substrate for the RT-QuIC assay, the temporal cortex seeds differentiated PD and DLB from healthy controls. In contrast to the temporal cortex, where PD and DLB could not be distinguished, αSyn 1-130 seeded by the detergent-soluble fractions from the PD frontal cortex demonstrated greater seeding efficiency compared to the DLB frontal cortex. Moreover, proteinase K-resistant (PK<sup>res</sup>) fragments from the RT-QuIC end products using C-αSyn 1-130 or C-αSyn 1-115 were more obvious in the frontal cortex compared to the temporal cortex. Morphological examinations of RT-QuIC end products showed differences in the size of the fibrils between C-αSyn 1-130 and C-αSyn 1-115, in agreement with the RT-QuIC results. These data show that C-αSyn species can distinguish PD from DLB and suggest diversity in αSyn species across these synucleinopathies, which could play a role in disease progression.https://www.mdpi.com/2218-273X/11/6/820synucleinopathiesParkinson’s diseasedementia with Lewy bodiesRT-QuICα-synucleinC-terminally truncated αSyn |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Ilaria Poggiolini Daniel Erskine Nishant N. Vaikath Janarthanan Ponraj Said Mansour Christopher M. Morris Omar M. A. El-Agnaf |
spellingShingle |
Ilaria Poggiolini Daniel Erskine Nishant N. Vaikath Janarthanan Ponraj Said Mansour Christopher M. Morris Omar M. A. El-Agnaf RT-QuIC Using C-Terminally Truncated α-Synuclein Forms Detects Differences in Seeding Propensity of Different Brain Regions from Synucleinopathies Biomolecules synucleinopathies Parkinson’s disease dementia with Lewy bodies RT-QuIC α-synuclein C-terminally truncated αSyn |
author_facet |
Ilaria Poggiolini Daniel Erskine Nishant N. Vaikath Janarthanan Ponraj Said Mansour Christopher M. Morris Omar M. A. El-Agnaf |
author_sort |
Ilaria Poggiolini |
title |
RT-QuIC Using C-Terminally Truncated α-Synuclein Forms Detects Differences in Seeding Propensity of Different Brain Regions from Synucleinopathies |
title_short |
RT-QuIC Using C-Terminally Truncated α-Synuclein Forms Detects Differences in Seeding Propensity of Different Brain Regions from Synucleinopathies |
title_full |
RT-QuIC Using C-Terminally Truncated α-Synuclein Forms Detects Differences in Seeding Propensity of Different Brain Regions from Synucleinopathies |
title_fullStr |
RT-QuIC Using C-Terminally Truncated α-Synuclein Forms Detects Differences in Seeding Propensity of Different Brain Regions from Synucleinopathies |
title_full_unstemmed |
RT-QuIC Using C-Terminally Truncated α-Synuclein Forms Detects Differences in Seeding Propensity of Different Brain Regions from Synucleinopathies |
title_sort |
rt-quic using c-terminally truncated α-synuclein forms detects differences in seeding propensity of different brain regions from synucleinopathies |
publisher |
MDPI AG |
series |
Biomolecules |
issn |
2218-273X |
publishDate |
2021-05-01 |
description |
Aggregated α-synuclein (αSyn) protein is a core pathological feature of Parkinson’s disease (PD) and dementia with Lewy bodies (DLB). Both PD and DLB demonstrate the presence of diverse intracellular α-synuclein (αSyn) species, including C-terminally truncated αSyn (C-αSyn), although it is unknown how C-αSyn species contribute to disease progression. Using recombinant C-αSyn and PD and DLB brain lysates as seeds in the real-time quaking-induced conversion (RT-QuIC) assay, we explored how C-αSyn may be involved in disease stratification. Comparing the seeding activity of aqueous-soluble fractions to detergent-soluble fractions, and using αSyn 1-130 as substrate for the RT-QuIC assay, the temporal cortex seeds differentiated PD and DLB from healthy controls. In contrast to the temporal cortex, where PD and DLB could not be distinguished, αSyn 1-130 seeded by the detergent-soluble fractions from the PD frontal cortex demonstrated greater seeding efficiency compared to the DLB frontal cortex. Moreover, proteinase K-resistant (PK<sup>res</sup>) fragments from the RT-QuIC end products using C-αSyn 1-130 or C-αSyn 1-115 were more obvious in the frontal cortex compared to the temporal cortex. Morphological examinations of RT-QuIC end products showed differences in the size of the fibrils between C-αSyn 1-130 and C-αSyn 1-115, in agreement with the RT-QuIC results. These data show that C-αSyn species can distinguish PD from DLB and suggest diversity in αSyn species across these synucleinopathies, which could play a role in disease progression. |
topic |
synucleinopathies Parkinson’s disease dementia with Lewy bodies RT-QuIC α-synuclein C-terminally truncated αSyn |
url |
https://www.mdpi.com/2218-273X/11/6/820 |
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