Journal Article

DZNE-2025-00727

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Alpha-synuclein co-pathology in Down syndrome-associated Alzheimer's disease.

Bernhardt, A. M. (First author)DZNE* ; Rodríguez-Baz, Í. ; Aldecoa, I. ; Arranz, J. ; Arriola-Infante, J. E. ; Maure-Blesa, L. ; Carmona-Iragui, M. ; Longen, S. ; Trossbach, S. V. ; Giese, A. ; Matthias, T. ; Benejam, B. ; Videla, L. ; Del Hoyo Soriano, L. ; Barroeta, I. ; Sanjuan, A. ; Fernández, S. ; Vaqué-Alcázar, L. ; Rozalem Aranha, M. ; Morcillo-Nieto, A. O. ; Nübling, G.DZNE* ; Wagemann, O.DZNE* ; Stockbauer, A.DZNE* ; Tondo, M. ; Bejanin, A. ; Lleó, A. ; Alcolea, D. ; Molina-Porcel, L. ; Fortea, J. ; Levin, J. (Last author)DZNE*

2025
Wiley Hoboken, NJ

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Please use a persistent id in citations: doi:10.1002/alz.70342

Abstract: Alpha-synuclein (αSyn) seed amplification assay (SAA) enables in vivo study of αSyn but remains underexplored in Down syndrome-associated Alzheimer's disease (DSAD).We analyzed αSyn-SAA in cerebrospinal fluid (CSF) from 270 adults with Down syndrome, from the Down Alzheimer Barcelona Neuroimaging Initiative and from the AD21 cohort from the Department of Neurology at the University Hospital, Ludwig Maximilian University of Munich, Germany. Neuropathological examinations were conducted in 19 brain donors (five with ante mortem CSF). Participants were classified as asymptomatic or symptomatic (prodromal/dementia) Alzheimer's disease (AD). CSF Aβ1-42/1-40, CSF and plasma p-Tau181, and neurofilament light chain (NfL) levels were measured. Neuropathological evaluations assessed AD neuropathological changes and Lewy body pathology (LBP).ΑSyn-SAA was positive in 9.2% of cases, independent of age or cognitive status. Symptomatic αSyn-positive cases exhibited higher plasma NfL levels than αSyn-negative cases (31 vs 21 pg/mL, p = 0.027). LBP was observed in 47% of necropsies. The individual with severe neocortical LBP was αSyn-SAA-positive.These findings highlight LBP prevalence in DSAD but suggest current SAA may fail to detect limited αSyn deposition.αSyn-SAA positivity in DSAD is 9.2%, similar to ADAD but lower than sporadic AD. Misfolded αSyn was detectable from early ages in individuals with DS. Positivity rates did not vary with age or clinical status in DS. Plasma NfL levels are higher in symptomatic αSyn-SAA positive versus negative cases. CSF αSyn seeding activity was associated with high neocortical LBP at necropsy.

Keyword(s): Humans (MeSH) ; Alzheimer Disease: pathology (MeSH) ; Alzheimer Disease: cerebrospinal fluid (MeSH) ; alpha-Synuclein: cerebrospinal fluid (MeSH) ; Down Syndrome: pathology (MeSH) ; Down Syndrome: complications (MeSH) ; Down Syndrome: cerebrospinal fluid (MeSH) ; Female (MeSH) ; Male (MeSH) ; Middle Aged (MeSH) ; Aged (MeSH) ; Amyloid beta-Peptides: cerebrospinal fluid (MeSH) ; Brain: pathology (MeSH) ; Biomarkers: cerebrospinal fluid (MeSH) ; tau Proteins: cerebrospinal fluid (MeSH) ; tau Proteins: blood (MeSH) ; Adult (MeSH) ; Neurofilament Proteins: cerebrospinal fluid (MeSH) ; Neurofilament Proteins: blood (MeSH) ; Alzheimer's disease ; Down syndrome ; Lewy body pathology ; biomarker ; neuropathology ; seed amplification assay ; α‐synuclein ; alpha-Synuclein ; Amyloid beta-Peptides ; Biomarkers ; tau Proteins ; Neurofilament Proteins

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Contributing Institute(s):

1. Clinical Research (Munich) (Clinical Research (Munich))
2. Clinical Neurodegeneration (AG Levin)
3. Molecular Neurobiology (AG Simons)

Research Program(s):

1. 353 - Clinical and Health Care Research (POF4-353) (POF4-353)
2. 351 - Brain Function (POF4-351) (POF4-351)

Appears in the scientific report 2025

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Clinical Medicine ; DEAL Wiley ; Essential Science Indicators ; IF >= 10 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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