Stepwise emergence of the neuronal gene expression program in early animal evolution

Najle, Sebastián R.; Grau Bové, Xavier; Elek, Anamaria; Navarrete Hernández, Cristina; Cianferoni, Damiano; Chiva, Cristina; Cañas Armenteros, Didac; Mallabiabarrena, Arrate; Kamm, Kai; Sabidó Aguadé, Eduard, 1981-; Gruber-Vodicka, Harald; Schierwater, Bernd; Serrano Pubull, Luis, 1982-; Sebé-Pedrós, Arnau

doi:http://dx.doi.org/10.1016/j.cell.2023.08.027

Stepwise emergence of the neuronal gene expression program in early animal evolution

Llicència

Citació

Najle SR, Grau-Bové X, Elek A, Navarrete C, Cianferoni D, Chiva C, Cañas-Armenteros D, Mallabiabarrena A, Kamm K, Sabidó E, Gruber-Vodicka H, Schierwater B, Serrano L, Sebé-Pedrós A. Stepwise emergence of the neuronal gene expression program in early animal evolution. Cell. 2023 Oct 12;186(21):4676-93.e29. DOI: 10.1016/j.cell.2023.08.027

Resum

The assembly of the neuronal and other major cell type programs occurred early in animal evolution. We can reconstruct this process by studying non-bilaterians like placozoans. These small disc-shaped animals not only have nine morphologically described cell types and no neurons but also show coordinated behaviors triggered by peptide-secreting cells. We investigated possible neuronal affinities of these peptidergic cells using phylogenetics, chromatin profiling, and comparative single-cell genomics in four placozoans. We found conserved cell type expression programs across placozoans, including populations of transdifferentiating and cycling cells, suggestive of active cell type homeostasis. We also uncovered fourteen peptidergic cell types expressing neuronal-associated components like the pre-synaptic scaffold that derive from progenitor cells with neurogenesis signatures. In contrast, earlier-branching animals like sponges and ctenophores lacked this conserved expression. Our findings indicate that key neuronal developmental and effector gene modules evolved before the advent of cnidarian/bilaterian neurons in the context of paracrine cell signaling.