This research utilizes electron microscopy connectomics to establish the first comprehensive logic of how mitochondria are organized within neural circuits. By analyzing datasets from both fruit flies and mice, the authors discovered that mitochondrial size and shape are so specific to individual cell types that they can function as biological fingerprints to identify neurons. The study further reveals that mitochondria are positioned with micrometer precision along neurites, showing a strong preference for clustering near presynaptic sites and within regions of high neural activity. In the fly mushroom body, mitochondrial enrichment varies across specific axonal compartments, suggesting that organelle distribution is directly linked to synaptic plasticity and learning. These findings demonstrate that mitochondria are not randomly scattered but are systematically embedded to support the specific energetic and functional demands of brain connectivity.

References:

• Sager G, Pfeiffer P, Wu H, et al. Spatial and morphological organization of mitochondria in neurons across a connectome[J]. Science, 2025: eads6674.