Investigating Cognitive Resilience in Long-Lived Bats: Challenges in Integrating Epigenetic Age, Spatial Memory, and Brain Structure

Abstract: Understanding the neural underpinnings of cognitive resilience in exceptionally long-lived species is crucial for uncovering strategies for healthy brain aging. This study aimed to investigate these mechanisms in 41 Egyptian fruit bats (\textit{Rousettus aegyptiacus}) by integrating epigenetic age (DNA methylation age), detailed spatial cognitive performance from a multi-phase foraging paradigm, and brain structural measures derived from MRI, such as whole-brain volume and fractional anisotropy. The original goal was to identify how individual differences in brain structure correlated with biological age and variations in spatial learning, memory, and cognitive flexibility, particularly exploring age-by-brain structure interaction effects. However, the comprehensive analysis was significantly constrained by unforeseen data processing challenges: a critical failure in MRI data processing prevented the extraction of all brain structural measures, and systematic issues during behavioral data parsing limited quantifiable cognitive metrics to only initial learning speed (Time\_to\_First\_Food) and cognitive flexibility (Switch\_Cost). From the successfully quantified data, no significant relationship was observed between epigenetic age and either initial spatial learning efficiency or cognitive flexibility. Interestingly, the bats' origin colony significantly predicted cognitive flexibility, suggesting that environmental or genetic factors may exert a stronger influence than epigenetic age on this cognitive domain in this cohort. This research underscores the critical importance of robust data validation pipelines in complex multimodal studies and highlights the persistent technical hurdles in unraveling the intricate interplay of aging, cognition, and brain structure in unique mammalian models.

Subjects:	q-bio.NC; q-bio.QM
Cite as:	PX:2508.00034