Tangential migration of corridor guidepost neurons contributes to anxiety circuits

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  • Andrea Tinterri
    IBENS, Département de Biologie École normale supérieure, CNRS, Inserm, PSL Research University Paris France
  • Marie Deck
    IBENS, Département de Biologie École normale supérieure, CNRS, Inserm, PSL Research University Paris France
  • Maryama Keita
    IBENS, Département de Biologie École normale supérieure, CNRS, Inserm, PSL Research University Paris France
  • Caroline Mailhes
    IBENS, Département de Biologie École normale supérieure, CNRS, Inserm, PSL Research University Paris France
  • Anna Noren Rubin
    University College of London, Wolfson Institute for Biomedical Research, Department of Cell and Developmental Biology London United Kingdom
  • Nicoletta Kessaris
    University College of London, Wolfson Institute for Biomedical Research, Department of Cell and Developmental Biology London United Kingdom
  • Ludmilla Lokmane
    IBENS, Département de Biologie École normale supérieure, CNRS, Inserm, PSL Research University Paris France
  • Franck Bielle
    IBENS, Département de Biologie École normale supérieure, CNRS, Inserm, PSL Research University Paris France
  • Sonia Garel
    IBENS, Département de Biologie École normale supérieure, CNRS, Inserm, PSL Research University Paris France

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<jats:title>Abstract</jats:title><jats:p>In mammals, thalamic axons are guided internally toward their neocortical target by corridor (Co) neurons that act as axonal guideposts. The existence of Co‐like neurons in non‐mammalian species, in which thalamic axons do not grow internally, raised the possibility that Co cells might have an ancestral role. Here, we investigated the contribution of corridor (Co) cells to mature brain circuits using a combination of genetic fate‐mapping and assays in mice. We unexpectedly found that Co neurons contribute to striatal‐like projection neurons in the central extended amygdala. In particular, Co‐like neurons participate in specific nuclei of the bed nucleus of the stria terminalis, which plays essential roles in anxiety circuits. Our study shows that Co neurons possess an evolutionary conserved role in anxiety circuits independently from an acquired guidepost function. It furthermore highlights that neurons can have multiple sequential functions during brain wiring and supports a general role of tangential migration in the building of subpallial circuits.</jats:p>

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