Fruit fly memory protein turns toxic with age, impairing cognition

A study in Cell reveals that a protein crucial for memory formation in fruit flies becomes problematic with age. Orb2, a so-called "functional amyloid" that normally helps store memories, changes its structure as flies age, transitioning from helpful to harmful. This structural evolution contributes directly to memory impairment in older Drosophila. The finding is significant because it demonstrates how proteins that serve essential functions early in life can become toxic later—a concept relevant to human aging. Functional amyloids exist throughout biology, and understanding how their structures degrade could illuminate broader patterns of age-related cognitive decline. While this is animal-model research, Drosophila has proven remarkably predictive for human neurobiology. The work suggests that preventing or reversing age-related changes in functional protein structures, rather than simply clearing all amyloids, might be a more nuanced strategy for maintaining cognitive function. This challenges the simplistic view that all amyloid formation is inherently pathological and points toward protein-structure maintenance as a potential therapeutic target for preserving memory in aging.