Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 106, Issue 28, Pages 11794-11799Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0812608106
Keywords
genetics; genomics; hippocampus; learning and memory; neuroanatomy
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Funding
- National Institutes of Health [MH083180, RR013642, NS16686, MH62122]
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Functional heterogeneity has been investigated for decades in the hippocampal region of the mammalian cerebral cortex, and evidence for vaguely defined dorsal'' and ventral'' regions is emerging. Direct evidence that hippocampal field CA1 displays clear regional, laminar, and pyramidal neuron differentiation is presented here, based on a systematic high-resolution analysis of a publicly accessible, genome-wide expression digital library (Allen Brain Atlas) [Lein et al. (2007) Genome-wide atlas of gene expression in the adult mouse brain. Nature 445: 168-176]. First, genetic markers reveal distinct spatial expression domains and subdomains along the longitudinal (dorsal/septal/posterior to ventral/temporal/anterior) axis of field CA1. Second, genetic markers divide field CA1 pyramidal neurons into multiple subtypes with characteristic laminar distributions. And third, subcortical brain regions receiving axonal projections from molecularly distinct spatial domains of field CA1 display distinct global gene expression patterns, suggesting that field CA1 spatial domains may be genetically wired independently to form distinct functional networks related to cognition and emotion. Insights emerging from this genomic-anatomic approach provide a starting point for a detailed analysis of differential hippocampal structure-function organization.
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