Cerebellar granular neuron progenitors exit their germinative niche via BarH-like1 activity mediated partly by inhibition of T-cell factor.

Autor:	Bou-Rouphael J; Sorbonne Université, CNRS UMR7622, Institut de Biologie Paris-Seine (IBPS) - Laboratoire de Biologie du Développement, 75005 Paris, France., Doulazmi M; Sorbonne Université, CNRS UMR8256, Institut de Biologie Paris-Seine (IBPS) - Laboratoire Adaptation Biologique et Vieillissement, 75005 Paris, France., Eschstruth A; Sorbonne Université, CNRS UMR7622, Institut de Biologie Paris-Seine (IBPS) - Laboratoire de Biologie du Développement, 75005 Paris, France., Abdou A; Sorbonne Université, CNRS UMR7622, Institut de Biologie Paris-Seine (IBPS) - Laboratoire de Biologie du Développement, 75005 Paris, France., Durand BC; Sorbonne Université, CNRS UMR7622, Institut de Biologie Paris-Seine (IBPS) - Laboratoire de Biologie du Développement, 75005 Paris, France.; Sorbonne Université, CNRS UMR8256, Institut de Biologie Paris-Seine (IBPS) - Laboratoire Adaptation Biologique et Vieillissement, 75005 Paris, France.
Jazyk:	angličtina
Zdroj:	Development (Cambridge, England) [Development] 2024 Jul 01; Vol. 151 (13). Date of Electronic Publication: 2024 Jul 10.
DOI:	10.1242/dev.202234
Abstrakt:	Cerebellar granule neuron progenitors (GNPs) originate from the upper rhombic lip (URL), a germinative niche in which developmental defects produce human diseases. T-cell factor (TCF) responsiveness and Notch dependence are hallmarks of self-renewal in neural stem cells. TCF activity, together with transcripts encoding proneural gene repressors hairy and enhancer of split (Hes/Hey), are detected in the URL; however, their functions and regulatory modes are undeciphered. Here, we established amphibian as a pertinent model for studying vertebrate URL development. The amphibian long-lived URL is TCF active, whereas the external granular layer (EGL) is non-proliferative and expresses hes4 and hes5 genes. Using functional and transcriptomic approaches, we show that TCF activity is necessary for URL emergence and maintenance. We establish that the transcription factor Barhl1 controls GNP exit from the URL, acting partly through direct TCF inhibition. Identification of Barhl1 target genes suggests that, besides TCF, Barhl1 inhibits transcription of hes5 genes independently of Notch signaling. Observations in amniotes suggest a conserved role for Barhl in maintenance of the URL and/or EGL via co-regulation of TCF, Hes and Hey genes. Competing Interests: Competing interests The authors declare no competing or financial interests. (© 2024. Published by The Company of Biologists Ltd.)
Databáze:	MEDLINE
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