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Ascl1 promotes tangential migration and confines migratory routes by induction of Ephb2 in the telencephalon.


ABSTRACT: During development, cortical interneurons generated from the ventral telencephalon migrate tangentially into the dorsal telencephalon. Although Achaete-scute family bHLH transcription factor 1 (Ascl1) plays important roles in the developing telencephalon, whether Ascl1 regulates tangential migration remains unclear. Here, we found that Ascl1 promoted tangential migration along the ventricular zone/subventricular zone (VZ/SVZ) and intermediate zone (IZ) of the dorsal telencephalon. Distal-less homeobox 2 (Dlx2) acted downstream of Ascl1 in promoting tangential migration along the VZ/SVZ but not IZ. We further identified Eph receptor B2 (Ephb2) as a direct target of Ascl1. Knockdown of EphB2 disrupted the separation of the VZ/SVZ and IZ migratory routes. Ephrin-A5, a ligand of EphB2, was sufficient to repel both Ascl1-expressing cells in vitro and tangentially migrating cortical interneurons in vivo. Together, our results demonstrate that Ascl1 induces expression of Dlx2 and Ephb2 to maintain distinct tangential migratory routes in the dorsal telencephalon.

SUBMITTER: Liu YH 

PROVIDER: S-EPMC5343589 | biostudies-literature | 2017 Mar

REPOSITORIES: biostudies-literature

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Ascl1 promotes tangential migration and confines migratory routes by induction of Ephb2 in the telencephalon.

Liu Yuan-Hsuan YH   Tsai Jin-Wu JW   Chen Jia-Long JL   Yang Wan-Shan WS   Chang Pei-Ching PC   Cheng Pei-Lin PL   Turner David L DL   Yanagawa Yuchio Y   Wang Tsu-Wei TW   Yu Jenn-Yah JY  

Scientific reports 20170309


During development, cortical interneurons generated from the ventral telencephalon migrate tangentially into the dorsal telencephalon. Although Achaete-scute family bHLH transcription factor 1 (Ascl1) plays important roles in the developing telencephalon, whether Ascl1 regulates tangential migration remains unclear. Here, we found that Ascl1 promoted tangential migration along the ventricular zone/subventricular zone (VZ/SVZ) and intermediate zone (IZ) of the dorsal telencephalon. Distal-less ho  ...[more]

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