What mechanisms cause plasma p-tau231 and p-tau217 to increase before overt amyloid plaque formation?

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Description

The study shows these tau phosphorylation markers rise with the lowest Aβ burden, before detectable plaque pathology. The biological mechanism linking early amyloid changes to specific tau phosphorylation events remains unexplained, yet understanding this could reveal critical early disease processes.

Gap type: unexplained_observation Source paper: Plasma p-tau231 and p-tau217 as state markers of amyloid-β pathology in preclinical Alzheimer’s disease. (2022, Nature medicine, PMID:35953717)

Resolution criteria

Resolution requires: (1) Cross-sectional and longitudinal human studies (n>=50 per group: cognitively normal amyloid-negative, amyloid-positive, and preclinical AD) with plasma p-tau231 and p-tau217 showing elevation >=2 SD above control in >=70% of amyloid-negative subjects who convert within 3 years; (2) Mechanistic studies in iPSC neurons or animal models demonstrating that neuronal tau phosphorylation at these sites occurs before amyloid aggregation, linked to upstream triggers (synaptic activity changes, mitochondrial stress); (3) Head-to-head comparison of p-tau231/217 vs p-tau181/205 showing temporal precedence (>=6 months earlier detection) for specific phosphoforms. Tau marker elevation without establishing temporal precedence to amyloid is insufficient.

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