Plexin-B2 controls the timing of differentiation and the motility of cerebellar granule neurons

• Verfasst von: Battum, Eljo van [VerfasserIn]
• Verfasst von: Heitz-Marchaland, Celine [VerfasserIn]
• Verfasst von: Zagar, Yvrick [VerfasserIn]
• Verfasst von: Fouquet, Stéphane [VerfasserIn]
• Verfasst von: Kuner, Rohini [VerfasserIn]
• Verfasst von: Chédotal, Alain [VerfasserIn]
• Titel: Plexin-B2 controls the timing of differentiation and the motility of cerebellar granule neurons
• Verf.angabe: Eljo Van Battum, Celine Heitz-Marchaland, Yvrick Zagar, Stéphane Fouquet, Rohini Kuner, Alain Chédotal
• E-Jahr: 2021
• Jahr: 8 June 2021
• Umfang: 34 S.
• Teil: volume:10
• Teil: year:2021
• Teil: elocationid:e60554
• Teil: pages:1-34
• Teil: extent:34
• Fussnoten: Gesehen am 12.08.2021
• Titel Quelle: Enthalten in: eLife
• Ort Quelle: Cambridge : eLife Sciences Publications, 2012
• Jahr Quelle: 2021
• Band/Heft Quelle: 10(2021), Artikel-ID e60554, Seite 1-34
• ISSN Quelle: 2050-084X
• DOI: doi:10.7554/eLife.60554
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: cell migration
• Sach-SW: cerebellum
• Sach-SW: cytokinesis
• Sach-SW: semaphorins
• K10plus-PPN: 1766559719

Abstract

Plexin-B2 deletion leads to aberrant lamination of cerebellar granule neurons (CGNs) and Purkinje cells. Although in the cerebellum Plexin-B2 is only expressed by proliferating CGN precursors in the outer external granule layer (oEGL), its function in CGN development is still elusive. Here, we used 3D imaging, in vivo electroporation and live-imaging techniques to study CGN development in novel cerebellum-specific Plxnb2 conditional knockout mice. We show that proliferating CGNs in Plxnb2 mutants not only escape the oEGL and mix with newborn postmitotic CGNs. Furthermore, motility of mitotic precursors and early postmitotic CGNs is altered. Together, this leads to the formation of ectopic patches of CGNs at the cerebellar surface and an intermingling of normally time-stamped parallel fibers in the molecular layer (ML), and aberrant arborization of Purkinje cell dendrites. There results suggest that Plexin-B2 restricts CGN motility and might have a function in cytokinesis.