Engulfment Genes Promote Neuronal Regeneration in Caenorhabditis Elegans: Two Divergent But Complementary Views.

BioEssays : News and Reviews in Molecular, Cellular and Developmental Biology
Chieh Chang, Naoki Hisamoto

Abstract

Axon regeneration is a conserved process across the animal kingdom. Recent studies using the soil worm Caenorhabditis elegans as a model system revealed that machineries regulating engulfment of dying cells also control axon regeneration and axon debris removal. In this review, the relationships between the engulfment machinery and the biological processes triggered by axon injury and subsequent axon regeneration drawn from divergent views are examined. In one study, it is found that engulfing cells directly promote axon regeneration. In this context, CED-1 (Drosophila Draper/mouse MEGF10), an engulfment protein expressed on the surface of engulfing cells, functions as a receptor for axon debris removal and as an adhesion molecule for axon regeneration. In other studies, it is shown that those engulfment genes, previously known to function within the engulfing cells for cell corpse removal, can have a cell-autonomous "non-engulfing cell" role in axon regeneration. Together, these findings suggest that engulfment genes are repurposed for neuronal regeneration by acting in both engulfing cells and regenerating neurons.

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Citations

Mar 21, 2021·Clinica Chimica Acta; International Journal of Clinical Chemistry·Wujun ChenDongming Xing

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