Alzheimer's & dementia (Amsterdam, Netherlands) · 2026
Atrophy signature for alpha-synuclein copathology in Alzheimer's disease.
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Esteller-Gauxax Diana, Guillén Núria, Falgàs Neus, Bosch Beatriz, Tort-Merino Adrià, Borrego-Écija Sergi, Puey Roger, Ruiz-Garcia Raquel, Naranjo Laura, Niñerola-Baizán Aida, Perissinotti Andrés, Bargalló Núria, Antonell Anna, Lladó Albert, Sánchez-Valle Raquel, Pérez-Millan Agnès, Balasa Mircea, Alzheimer's Disease Neuroimaging Initiative (ADNI)
Аннотация
INTRODUCTION: Brain atrophy patterns in Alzheimer's disease (AD) are well established, however, the contribution of alpha-synuclein (α-syn) copathology to these patterns remains unclear. This study investigates magnetic resonance imaging (MRI) -based atrophy patterns in AD patients with α-syn copathology.
METHODS: We study two independent cohorts: Hospital Clinic Barcelona (N = 139) and Alzheimer's Disease Neuroimaging Initiative (ADNI) (N = 191). Participants were classified into AD-α-syn seed amplification assay positive (αSAA+), AD-αSAA-, and healthy controls (CTR). Group comparisons of MRI regions were conducted using permutation tests adjusting for age and sex.
RESULTS: Compared to CTR, both AD-αSAA- and AD-αSAA+ showed widespread cortical thinning. Direct comparison of AD-αSAA+ versus AD-αSAA- revealed differential involvement of insular, entorhinal, lateral temporal, pre and postcentral gyrus, frontal cortices, and amygdala, although with minimum size effect.
DISCUSSION: α-Syn copathology was associated with more extensive and pronounced atrophy, especially in frontal, lateral temporal, entorhinal, and amygdalar regions. This suggests that α-syn is associated with greater neurodegeneration beyond typical AD patterns.
METHODS: We study two independent cohorts: Hospital Clinic Barcelona (N = 139) and Alzheimer's Disease Neuroimaging Initiative (ADNI) (N = 191). Participants were classified into AD-α-syn seed amplification assay positive (αSAA+), AD-αSAA-, and healthy controls (CTR). Group comparisons of MRI regions were conducted using permutation tests adjusting for age and sex.
RESULTS: Compared to CTR, both AD-αSAA- and AD-αSAA+ showed widespread cortical thinning. Direct comparison of AD-αSAA+ versus AD-αSAA- revealed differential involvement of insular, entorhinal, lateral temporal, pre and postcentral gyrus, frontal cortices, and amygdala, although with minimum size effect.
DISCUSSION: α-Syn copathology was associated with more extensive and pronounced atrophy, especially in frontal, lateral temporal, entorhinal, and amygdalar regions. This suggests that α-syn is associated with greater neurodegeneration beyond typical AD patterns.