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PLoS Biol ; 21(8): e3002212, 2023 08.
Article in English | MEDLINE | ID: mdl-37540708

ABSTRACT

The mature mammalian cortex is composed of 6 architecturally and functionally distinct layers. Two key steps in the assembly of this layered structure are the initial establishment of the glial scaffold and the subsequent migration of postmitotic neurons to their final position. These processes involve the precise and timely regulation of adhesion and detachment of neural cells from their substrates. Although much is known about the roles of adhesive substrates during neuronal migration and the formation of the glial scaffold, less is understood about how these signals are interpreted and integrated within these neural cells. Here, we provide in vivo evidence that Cas proteins, a family of cytoplasmic adaptors, serve a functional and redundant role during cortical lamination. Cas triple conditional knock-out (Cas TcKO) mice display severe cortical phenotypes that feature cobblestone malformations. Molecular epistasis and genetic experiments suggest that Cas proteins act downstream of transmembrane Dystroglycan and ß1-Integrin in a radial glial cell-autonomous manner. Overall, these data establish a new and essential role for Cas adaptor proteins during the formation of cortical circuits and reveal a signaling axis controlling cortical scaffold formation.


Subject(s)
Adaptor Proteins, Signal Transducing , Dystroglycans , Integrin beta1 , Neuroglia , Animals , Mice , Adaptor Proteins, Signal Transducing/genetics , Adaptor Proteins, Signal Transducing/metabolism , Cell Movement/physiology , Cerebral Cortex/metabolism , Dystroglycans/genetics , Dystroglycans/metabolism , Integrin beta1/genetics , Integrin beta1/metabolism , Neuroglia/metabolism , Neurons/physiology , Signal Transduction/physiology
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