Tuba8 Drives Differentiation of Cortical Radial Glia into Apical Intermediate Progenitors by Tuning Modifications of Tubulin C Termini.

Tuba8 Drives Differentiation of Cortical Radial Glia into Apical Intermediate Progenitors by Tuning Modifications of Tubulin C Termini.:

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Tuba8 Drives Differentiation of Cortical Radial Glia into Apical Intermediate Progenitors by Tuning Modifications of Tubulin C Termini.

Dev Cell. 2020 Feb 24;52(4):477-491.e8

Authors: Ramos SI, Makeyev EV, Salierno M, Kodama T, Kawakami Y, Sahara S

Abstract

Most adult neurons and glia originate from radial glial progenitors (RGs), a type of stem cell typically extending from the apical to the basal side of the developing cortex. Precise regulation of the choice between RG self-renewal and differentiation is critical for normal development, but the mechanisms underlying this transition remain elusive. We show that the non-canonical tubulin Tuba8, transiently expressed in cortical progenitors, drives differentiation of RGs into apical intermediate progenitors, a more restricted progenitor type lacking attachment to the basal lamina. This effect depends on the unique C-terminal sequence of Tuba8 that antagonizes tubulin tyrosination and Δ2 cleavage, two post-translational modifications (PTMs) essential for RG fiber maintenance and the switch between direct and indirect neurogenesis and ultimately distinct neuronal lineage outcomes. Our work uncovers an instructive role of a developmentally regulated tubulin isotype in progenitor differentiation and provides new insights into biological functions of the cellular tubulin PTM "code."

PMID: 32097653 [PubMed - as supplied by publisher]