Biomarkers.

Background: Plasma tau phosphorylated at threonine 231 (p-tau231) is a promising novel biomarker of emerging Alzheimer's disease (AD) pathology. We aimed to characterize cross-sectional and longitudinal plasma p-tau231 measurements and estimated ages of biomarker onset in an exceptionally large number of presenilin (PSEN1) E280A (Glu280Ala) mutation carriers and age-matched non-carriers from the Colombian autosomal dominant Alzheimer's disease kindred.

Method: We included a cohort of 722 PSEN1 E280A mutation carriers (mean age 36.

Biomarkers.

Background: Biomarkers, such as blood p-tau181, p-tau217, and p-tau231, have been created and verified to mirror the pathophysiology of tau and amyloid-β (Aβ) in the brain . Sleep spindles are known to contribute to memory consolidation and generalization and may therefore be a promising biomarker in preclinical Alzheimer's Disease (AD) . The present study investigated the relationship between sleep spindles and p-tau levels in cognitively healthy older African Americans.

Biomarkers.

Background: A key characteristic of Alzheimer's disease (AD) is cerebral aggregation of tau. These aggregates can be quantified and localized with positron emission tomography (PET), which improves the diagnostic and prognostic work-up of AD. However, tau-PET is expensive and not available in clinical settings globally.

Biomarkers.

Background: Alzheimer's disease (AD) blood biomarkers alone can detect amyloid-β (Aβ) pathology in cognitively unimpaired (CU) individuals. We assessed whether combining different plasma biomarkers improves the detection of Aβ-positivity and identifies rapid amyloid deposition in CU individuals.

Method: CU participants from the ALFA+ cohort were included.

Biomarkers.

Background: The research on Alzheimer's disease (AD) has substantially advanced in relation to plasma biomarkers, such as pTau217, for the detection of amyloid (Aβ) pathology which identify, with high accuracy, individuals in the AD biological continuum. However, as these biomarkers become abnormal very early in the disease, biomarkers identifying more advanced disease stages and proxying pathophysiological processes beyond amyloidosis are still needed. Therefore, we have conducted a proteomic study, on plasma and CSF, aiming at identifying proteins reflecting pathological changes in AD.