Cell Type Phylogenetics Informs the Evolutionary Origin of Echinoderm Larval Skeletogenic Cell Identity

Overview

Journal Commun Biol

Specialty Biology

Date 2019 May 10

PMID 31069269

Citations 9

Authors

Eric M Erkenbrack

Jeffrey R Thompson

Affiliations

Soon will be listed here.

Abstract

The multiplicity of cell types comprising multicellular organisms begs the question as to how cell type identities evolve over time. Cell type phylogenetics informs this question by comparing gene expression of homologous cell types in distantly related taxa. We employ this approach to inform the identity of larval skeletogenic cells of echinoderms, a clade for which there are phylogenetically diverse datasets of spatial gene expression patterns. We determined ancestral spatial expression patterns of , and , key components of the skeletogenic gene regulatory network driving identity of the larval skeletogenic cell. Here we show ancestral state reconstructions of spatial gene expression of extant eleutherozoan echinoderms support homology and common ancestry of echinoderm larval skeletogenic cells. We propose larval skeletogenic cells arose in the stem lineage of eleutherozoans during a cell type duplication event that heterochronically activated adult skeletogenic cells in a topographically distinct tissue in early development.

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