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- W1975389666 abstract "Comprehensive knowledge of the brain’s wiring diagram is fundamental for understanding how the nervous system processes information at both local and global scales. However, with the singular exception of the C. elegans microscale connectome, there are no complete connectivity data sets in other species. Here we report a brain-wide, cellular-level, mesoscale connectome for the mouse. The Allen Mouse Brain Connectivity Atlas uses enhanced green fluorescent protein (EGFP)-expressing adeno-associated viral vectors to trace axonal projections from defined regions and cell types, and high-throughput serial two-photon tomography to image the EGFP-labelled axons throughout the brain. This systematic and standardized approach allows spatial registration of individual experiments into a common three dimensional (3D) reference space, resulting in a whole-brain connectivity matrix. A computational model yields insights into connectional strength distribution, symmetry and other network properties. Virtual tractography illustrates 3D topography among interconnected regions. Cortico-thalamic pathway analysis demonstrates segregation and integration of parallel pathways. The Allen Mouse Brain Connectivity Atlas is a freely available, foundational resource for structural and functional investigations into the neural circuits that support behavioural and cognitive processes in health and disease. In mouse, an axonal connectivity map showing the wiring patterns across the entire brain has been created using an EGFP-expressing adeno-associated virus tracing technique, providing the first such whole-brain map for a vertebrate species. With President Barack Obama's BRAIN (Brain Research through Advancing Innovative Neurotechnologies) initiative now entering year two, this issue of Nature presents two landmark papers that mobilize 'big science' resources to the cause. Hongkui Zeng and colleagues present the first brain-wide, mesoscale connectome for a mammalian species — the laboratory mouse — based on cell-type-specific tracing of axonal projections. The wiring diagram of a complete nervous system has long been available for a small roundworm, but neuronal connectivity data for larger animals has been patchy until now. The new three-dimensional Allen Mouse Brain Connectivity Atlas is a whole-brain connectivity matrix that will provide insights into how brain regions communicate. Much of the data generated in this project will be of relevance to investigations of neural networks in humans and should help to further our understanding of human brain connectivity and its involvement in brain disorders. In a separate report Ed Lein and colleagues present a transcriptional atlas of the mid-gestational human brain at high spatial resolution, based on laser microdissection and DNA microarray technology. The structure and function of the human brain is largely determined by prenatal transcriptional processes that initiate gene expression, but our understanding of the developing brain has been limited. The new data set reveals transcriptional signatures for developmental processes associated with the massive expansion of neocortex during human evolution, and suggests new cortical germinal zones or postmitotic neurons as sites of dynamic expression for many genes associated with neurological or psychiatric disorders." @default.
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- W1975389666 date "2014-04-01" @default.
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- W1975389666 title "A mesoscale connectome of the mouse brain" @default.
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