New Alzheimer’s Discovery: Tau Protein Spreads Through Neuronal Wiring Following Individual Brain Connectivity

UAB researchers use fMRI and genetic data to prove tau protein travels through synaptic networks in Alzheimer's, identifying a key target for new therapies.

By: AXL Media

Published: Apr 8, 2026, 11:38 AM EDT

Source: Information for this report was sourced from EurekAlert!

Deciphering the Transmission of Tau Pathology

In a major advancement for neurodegenerative research, a study published in Neuron has provided definitive evidence of how tau protein tangles migrate across the brain. While it has long been known that amyloid-beta plaques and tau tangles are the hallmarks of Alzheimer’s, the exact "road map" for tau’s movement remained a subject of theory. The new research, led by Jeremy Herskowitz, Ph.D., at UAB, demonstrates that tau aggregates function as seeds that travel from neuron to neuron via synapses. This transmission follows the brain’s natural scaffolding, eventually reaching the neocortex and triggering the cognitive decline associated with advanced dementia.

Utilizing Decades of Longitudinal and Genetic Data

The team conducted a decade-long analysis involving 128 participants from the Religious Orders Study and Memory and Aging Project (ROSMAP). By examining postmortem samples from the temporal lobe—critical for memory recall—and the frontal lobe—responsible for complex thought—researchers could track the physical progression of the disease. To confirm a causal link, the study employed Mendelian randomization, a statistical genetic approach that utilized each participant’s genomic DNA to prove that seeds generated in the temporal cortex were the direct cause of pathology in the neocortex.

The Role of Individual Brain Connectivity

A unique aspect of this study was the integration of antemortem functional magnetic resonance imaging (fMRI) with postmortem tissue analysis. The results revealed that tau does not spread randomly; instead, it travels primarily along an individual’s specific neural communication pathways. Because these synaptic networks vary from person to person, an individual’s unique "brain wiring" helps determine the speed and extent of their Alzheimer's progression. This personalized spread explains why the disease manifests differently across various patient populations.