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The m6A reader Ythdf restricts axonal growth in Drosophila through target selection modulation of the Fragile X mental retardation protein

Soldano, A.; Worpenberg, L.; Paolantoni, C.; Longhi, S.; Mulorz, M. M.; Lence, T.; Wessels, H.-H.; Aiello, G.; Notarangelo, M.; Sutandy, F. R.; Scheibe, M.; Edupuganti, R. R.; Busch, A.; Mockel, M. M.; Vermeulen, M.; Butter, F.; Konig, J.; Ohler, U.; Dieterich, C.; Quattrone, A.; Roignant, J.-Y.

2020-03-05 molecular biology
10.1101/2020.03.04.976886 bioRxiv
Show abstract

N6-methyladenosine (m6A) regulates a variety of physiological processes through modulation of RNA metabolism. The modification is particularly enriched in the nervous system of several species, and its dysregulation has been associated with neurodevelopmental defects and neural dysfunctions. In Drosophila, loss of m6A alters fly behavior albeit the underlying mechanism and the role of m6A during nervous system development have remained elusive. Here we find that impairment of the m6A pathway leads to axonal overgrowth and misguidance at larval neuromuscular junctions as well as in the adult mushroom bodies. We identify Ythdf as the main m6A reader in the nervous system being required for limiting axonal growth. Mechanistically, we show that Ythdf directly interacts with Fragile X mental retardation protein to inhibit the translation of key transcripts involved in axonal growth regulation. Altogether, this study demonstrates that the m6A pathway controls development of the nervous system by modulating Fmr1 target selection.

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