Immune Genes in Echinodermata, Immune Cellular Differentiations in Invertebrates

We attempt to compare in the present report the found immune genes in the fifth classes of Echinodermata : the Echinids, the Asterids, the Ophuirids, the Crinoïds, and the Holothurids.

3 classes show the existence of an IGKappa gene, a Fc receptor gene ; a Fab gene.

This phenomenon seems linked to the existence, in them, of the presence or not of an axial organ which is considered, in Asterids, as an ancestral lymphoïd organ.Sea star lymphocytes were shown.

Keywords: Invertebrates ; Echinodermata;axial organ ; IGKappa gene.Primitive antibody.