MicroRNA-15b promotes neurogenesis and inhibits neural progenitor proliferation by directly repressing TET3 during early neocortical development.
EMBO Rep
; 15(12): 1305-14, 2014 Dec.
Article
em En
| MEDLINE
| ID: mdl-25344561
ABSTRACT
MicroRNAs (miRNAs) are important regulators of mouse brain development. However, their precise roles in this context remain to be elucidated. Through screening of expression profiles from a miRNA microarray and experimental analysis, we show here that miR-15b controls several aspects of cortical neurogenesis. miR-15b inhibits cortical neural progenitor cell (NPC) proliferation and promotes cell-cycle exit and neuronal differentiation. Additionally, miR-15b expression decreases the number of apical progenitors and increases basal progenitors in the VZ/SVZ. We also show that miR-15b binds to the 3' UTR of TET3, which plays crucial roles during embryonic development by enhancing DNA demethylation. TET3 promotes cyclin D1 expression, and miR-15b reduces TET3 expression and 5hmC levels. Notably, TET3 expression rescues miR-15b-induced impaired NPC proliferation and increased cell-cycle exit in vivo. Our results not only reveal a link between miRNAs, TET, and DNA demethylation but also demonstrate critical roles for miR-15b and TET3 in maintaining the NPC pool during early neocortical development.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Proteínas Proto-Oncogênicas
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Neocórtex
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MicroRNAs
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Proteínas de Ligação a DNA
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Neurogênese
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Células-Tronco Neurais
Limite:
Animals
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Pregnancy
Idioma:
En
Ano de publicação:
2014
Tipo de documento:
Article