A critical developmental window for ELAV/Hu-dependent mRNA signatures at the 
onset of neuronal differentiation

Carrasco, Judit; Mateos, Fernando; Hilgers, Valérie

doi:10.1016/j.celrep.2022.111542

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A critical developmental window for ELAV/Hu-dependent mRNA signatures at the onset of neuronal differentiation

MPS-Authors

Carrasco, Judit
Max Planck Institute of Immunobiology and Epigenetics, Max Planck Society;

Mateos, Fernando
Max Planck Institute of Immunobiology and Epigenetics, Max Planck Society;

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Hilgers, Valérie
Max Planck Institute of Immunobiology and Epigenetics, Max Planck Society;

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https://www.sciencedirect.com/science/article/pii/S2211124722013985
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Citation

Carrasco, J., Mateos, F., & Hilgers, V. (2022). A critical developmental window for ELAV/Hu-dependent mRNA signatures at the onset of neuronal differentiation. Cell Reports, 41: 111542. doi:10.1016/j.celrep.2022.111542.

Cite as: https://hdl.handle.net/21.11116/0000-000B-552D-4

Abstract

Cell-type-specific gene regulatory programs are essential for cell differentiation and function. In animal neurons, the highly conserved ELAV/Hu family of proteins promotes alternative splicing and polyadenylation of mRNA precursors to create unique neuronal transcript isoforms. Here, we assess transcriptome profiles and neurogenesis success in Drosophila models engineered to express differing levels of ELAV activity in the course of development. We show that the ELAV-mediated establishment of a subset of neuronal mRNA isoforms at the onset of neuron differentiation constitutes a developmental bottleneck that cannot be overcome later by the nuclear activation of the paralog found in neurons (FNE). Loss of ELAV function outside of that critical time window results in neurological defects. We find that FNE, when activated early enough, can restore ELAV-dependent neuronal mRNA isoforms and fully rescue development. Our findings demonstrate the essential role of robust cellular strategies to maintain ELAV activity and intact neuronal signatures in neurogenesis and neuronal function.