Summary: In brains affected by Alzheimer’s and Parkinson’s diseases, proteins such as Tau and alpha-synuclein can misfold and assemble into toxic aggregates that damage neurons. A new study identifies a surprising natural protector: tubulin, the main component of microtubules — the cell’s internal “railway tracks.”
Researchers report that when tubulin is abundant, it interacts with Tau and alpha-synuclein and steers them away from forming harmful aggregates, guiding them back to their normal roles in maintaining cell structure and supporting intracellular transport. This work reframes tubulin from a passive casualty of neurodegeneration into an active defender, suggesting that preserving or enhancing the tubulin pool might be a viable strategy to prevent or slow disease progression.
Key Facts
- The healthy pathway: Tubulin prevents Tau and alpha-synuclein from adopting aggregation-prone states by redirecting them toward productive involvement in microtubule assembly and stabilization.
- Condensates and droplets: Both physiological and pathological behaviors of these proteins occur within tiny, membraneless droplets called condensates. Tubulin does not eliminate these condensates; instead, it alters the molecular processes that take place inside them.
- From victim to protector: Rather than being merely depleted during disease, tubulin actively suppresses toxic aggregation: a robust tubulin pool limits the formation of harmful oligomers.
- Dual-disease relevance: Because tubulin influences both Tau (linked to Alzheimer’s) and alpha-synuclein (linked to Parkinson’s), approaches that maintain tubulin function could address multiple neurodegenerative disorders.
- Biomarker potential: Reduced tubulin levels in the brain may serve as an early indicator of a shift toward pathological protein aggregation.
Source: Baylor College of Medicine
Researchers at Baylor College of Medicine have identified a possible new approach to counteract the toxic accumulation of Tau and alpha-synuclein that characterizes Alzheimer’s and Parkinson’s diseases.
Published in Nature Communications, the study shows that tubulin, the fundamental unit of microtubules, can suppress the formation of pathogenic Tau and alpha-synuclein aggregates and instead promote their normal, beneficial activities.
“Tau and alpha-synuclein are widely studied because of their roles in neurodegenerative disease,” said Dr. Lathan Lucas, first author and postdoctoral associate in biochemistry and molecular pharmacology in Dr. Allan Ferreon’s lab. “Under disease conditions, these proteins can misfold, stick together and form aggregates that harm neurons and contribute to symptoms such as memory loss and impaired movement.”
Yet Tau and alpha-synuclein also perform essential tasks in healthy neurons: they interact with tubulin to support microtubule formation, maintain cytoskeletal integrity and facilitate communication between cells.
Both their physiological functions and their pathological activities occur inside membraneless condensates. While disrupting condensate formation has been proposed as a therapeutic route, condensates also mediate healthy cellular processes, so broad prevention could impair normal neuron function. The Baylor team instead asked whether it was possible to preserve condensates but change what happens inside them — nudging proteins toward beneficial behaviors rather than pathological ones.
“Imagine Tau and alpha-synuclein as restless students,” said Dr. Allan Ferreon, associate professor and co-corresponding author. “You can either shut the classroom down — removing both misbehavior and learning — or you can give those students meaningful tasks so they stay engaged. Tubulin supplies those meaningful tasks.”
Using biochemical and biophysical assays, high-resolution microscopy and neuronal models, the researchers examined how tubulin influences Tau:alpha-synuclein condensates and whether it can block the transition to toxic oligomers and fibrils. They found that in tubulin-poor conditions, condensates favor formation of pathogenic heterodimers and amyloid fibrils. By contrast, when tubulin is present and partitions into condensates, it promotes microtubule polymerization and prevents both homotypic and heterotypic oligomerization.
“When tubulin levels fall, as has been observed in Alzheimer’s disease, microtubule networks weaken and Tau and alpha-synuclein are more likely to aggregate,” Lucas explained. “Providing tubulin-like interactions gives these proteins something productive to do, reducing their tendency to form toxic species.”
Ferreon added: “This changes how we think about tubulin in neurodegeneration. Instead of treating tubulin loss as merely a consequence, we can view maintenance of the tubulin pool as a preventative measure that protects neurons while preserving the natural functions of Tau and alpha-synuclein.”
Other contributors include co-first author Phoebe S. Tsoi, My Diem Quan, Kyoung-Jae Choi and co-corresponding author Josephine C. Ferreon, all at Baylor College of Medicine.
Funding: Supported by NINDS-NIH grant R01 NS105874, Welch Foundation grant Q-2097-20220331 and NIGMS-NIH grant R01 GM122763.
Key Questions Answered:
A: They are not intrinsically harmful. In healthy neurons they are essential for maintaining internal structure and supporting transport along microtubules. Removing them would eliminate their normal functions along with any pathological potential.
A: Tubulin serves as a productive binding partner: when Tau and alpha-synuclein associate with tubulin, they participate in microtubule assembly and stabilization, which reduces their tendency to misfold and aggregate.
A: Not currently. Tubulin is produced inside cells and is not available as a simple supplement. This research, however, points toward developing drugs or interventions that enhance tubulin production, stability or function in the brain.
Editorial Notes:
- This article was edited by a Neuroscience News editor.
- The journal paper was reviewed in full by staff.
- Additional context was added by editorial staff to clarify findings.
About this neurology research news
Author: Ana Rodriguez
Source: Baylor College of Medicine
Contact: Ana Rodriguez – Baylor College of Medicine
Image: Image credit: Neuroscience News
Original Research: Open access. “Tubulin transforms Tau and α-synuclein condensates from pathological to physiological” by Lathan Lucas, Phoebe S. Tsoi, My Diem Quan, Kyoung-Jae Choi, Josephine C. Ferreon & Allan Chris M. Ferreon. Nature Communications
DOI: 10.1038/s41467-026-69618-3
Abstract
Tubulin transforms Tau and α-synuclein condensates from pathological to physiological
Proteins can undergo phase separation to form membraneless condensates that concentrate molecular interactions. Those condensates can either support normal cellular physiology or promote pathological aggregation. Tau and α-synuclein form heterotypic condensates implicated in both healthy processes and disease. They regulate microtubules but also can misfold and co-deposit into aggregates linked to neurodegeneration.
This study demonstrates that tubulin modulates Tau:α-synuclein condensates by enhancing microtubule interactions and inhibiting formation of pathological oligomers. Without tubulin, Tau-driven condensation accelerates the development of toxic heterodimers and amyloid fibrils. When tubulin partitions into condensates it promotes microtubule polymerization and prevents Tau and α-synuclein oligomerization, revealing distinct structural states associated with pathological (tubulin-absent) versus physiological (tubulin-rich) condensates. In neuronal models, loss of microtubules favors pathological oligomers and neurite degeneration, whereas inducible Tau condensation in the presence of tubulin stabilizes microtubules.