COGNITIVE HETEROGENEITY AND AGING: AN AGE-INDEPENDENT CILIARY GENE PROGRAM TRACKS COGNITIVE RESILIENCE IN MICE
Cognitive decline with age is often viewed as inevitable, yet older animals show striking heterogeneity in functional trajectories, with many preserving cognitive integrity despite physiological decline. The biological basis of this resilience remains poorly understood, partly due to insensitive behavioral testing paradigms. Using an automated home-cage platform and hippocampal RNA sequencing, we…
A recent study reveals that healthy cognitive aging in mice may be linked to a specific transcriptional signature involving a gene program focused on ciliary structure and motility. This discovery challenges the notion that cognitive decline is an inevitable consequence of aging, suggesting that individual resilience may be driven by intrinsic molecular set points rather than chronological age.
By analyzing behavior patterns and transcriptomic data from 906 C57BL/6 mice across 129 studies, researchers identified 271 genes associated with cognitive performance that remain stable regardless of age. Mice exhibiting preserved cognition demonstrated higher expression of genes related to ciliary structure, neurite organization, and synaptic architecture.
Conversely, impaired cognition was associated with neuroimmune and metabolic-stress programs. By creating a 38-gene "cilia structural module score," the study found that this score correlated strongly with cognitive resilience, with a partial correlation of -0.81, even after accounting for age. This finding was consistent across leave-one-out resampling, indicating robustness.
Although the genes in the module were selected based on the same outcome, recalibrating against a null hypothesis provided an empirical p-value of 0.026, lending credibility to the result. Intriguingly, the module was predominantly localized to ependymal cells, with 27 of the 38 genes being ependymal-restricted and three of them also detected in CA1 glutamatergic neurons.
The association with cognitive resilience was not driven by the abundance of ependymal cells but rather by the level of ciliary program expression. This research suggests that cognitive trajectories may be shaped by innate molecular signatures rather than age, and that targeting the expression of a motile ciliary program at the cerebrospinal fluid interface could be a promising avenue for developing resilience-enhancing strategies across the lifespan.
Written by urgent.news from bioRxiv's reporting — not their text. Machine-written — may contain errors; check the original before relying on it.
