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Diverse and asymmetric patterns of single-neuron projectome in regulating interhemispheric connectivity
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Journal Article
Diverse and asymmetric patterns of single-neuron projectome in regulating interhemispheric connectivity
2024
Overview
The corpus callosum, historically considered primarily for homotopic connections, supports many heterotopic connections, indicating complex interhemispheric connectivity. Understanding this complexity is crucial yet challenging due to diverse cell-specific wiring patterns. Here, we utilized public AAV bulk tracing and single-neuron tracing data to delineate the anatomical connection patterns of mouse brains and conducted wide-field calcium imaging to assess functional connectivity across various brain states in male mice. The single-neuron data uncovered complex and dense interconnected patterns, particularly for interhemispheric-heterotopic connections. We proposed a metric “heterogeneity” to quantify the complexity of the connection patterns. Computational modeling of these patterns suggested that the heterogeneity of upstream projections impacted downstream homotopic functional connectivity. Furthermore, higher heterogeneity observed in interhemispheric-heterotopic projections would cause lower strength but higher stability in functional connectivity than their intrahemispheric counterparts. These findings were corroborated by our wide-field functional imaging data, underscoring the important role of heterotopic-projection heterogeneity in interhemispheric communication.
How interhemispheric connections are organized and how interhemispheric communication are regulated are not fully understood. Here authors delineate the diverse single-neuron projection patterns of interhemispheric connections in mice and uncover their influence on functional dynamics, highlighting the importance of heterotopic projections in interhemispheric communication.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
