Romano, Anna Lisa (2013) Role of the transcription factors COUP-TFI and Pax6 in neural stem cell self-renewal and neurogenesis during mouse cortical development. [Tesi di dottorato]

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Item Type: Tesi di dottorato
Lingua: English
Title: Role of the transcription factors COUP-TFI and Pax6 in neural stem cell self-renewal and neurogenesis during mouse cortical development
Creators:
CreatorsEmail
Romano, Anna Lisaa.romano@unina.it
Date: 10 April 2013
Number of Pages: 142
Institution: Università degli Studi di Napoli Federico II
Department: Biologia strutturale e funzionale
Scuola di dottorato: Scienze biologiche
Dottorato: Biochimica e biologia cellulare e molecolare
Ciclo di dottorato: 25
Coordinatore del Corso di dottorato:
nomeemail
Arcari, Paoloarcari@unina.it
Tutor:
nomeemail
Pizzo, Eliodoroelipizzo@unina.it
Studer, Michélemichele.studer@unice.fr
Date: 10 April 2013
Number of Pages: 142
Uncontrolled Keywords: Neural embryonic stem cells; Neurospheres; Self-renewal;cortical progenitors.
Settori scientifico-disciplinari del MIUR: Area 05 - Scienze biologiche > BIO/10 - Biochimica
Area 05 - Scienze biologiche > BIO/11 - Biologia molecolare
Additional Information: Part of the thesis was done in the IBV, Institute of Biology Valrose
Date Deposited: 10 Apr 2013 15:51
Last Modified: 31 Dec 2016 02:00
URI: http://www.fedoa.unina.it/id/eprint/9556

Abstract

Area-specific cytoarchitecture implies a tight spatiotemporal control on the lateral expansion of individual cortical areas coupled to radial growth, which will determine cortical thickness and cell-type specification. The mode of neural-progenitor cell divisions determines cell number and direction of cortical expansion and growth. While progenitors initially divide symmetrically to increase the stem cell pool, asymmetrically dividing radial glial cells will subsequently expand the pool of differentiating cells. The molecular mechanisms that regulate the switch from symmetric to asymmetric division during cortical arealization are poorly understood. The transcription factors COUP-TFI and Pax6 are expressed in opposite gradients and required to co-ordinately control areal and laminar identity during corticogenesis. Recently, Pax6 has been demonstrated to regulate the orientation and mode of cell divisions in the mouse cortex. In the first part of my work, I found that in the absence of COUP-TFI function cortical cells abnormally proliferate over time, implying that COUP-TFI is responsible for maintaining a proper progenitor pool during development. Next, by generating double compound mutants between COUP-TFI and Pax6, I found that lowering the gene dosage of Pax6 in COUP-TFI mutants, and vice versa, of COUP-TFI in Pax6 mutants, rescued the reciprocal mutant phenotype. In vivo analysis on cortical primordia using markers of apical (self-renewal) versus basal (neurogenic) progenitors, confirmed most of the in vitro results, even if the in vivo situation resulted to be more complex. Overall, these data strongly suggest a molecular cross-regulation between COUP-TFI and Pax6 during the maintenance of a proper balance between the stem/ progenitor and committed precursor pools, most probably acting on similar target genes.

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