We describe an evolutionary comparison of expression of the @entity69816 gene families of two congeneric sea urchins. Heliocidaris tuberculata develops indirectly via a planktonic feeding pluteus that forms a juvenile rudiment after a long period of larval development. H. erythrogramma is a direct developer that initiates formation of a juvenile rudiment immediately following gastrulation. The developmental expression of each @entity69816 isoform of both species was determined by in situ hybridization. The observed expression patterns are compared with known expression patterns in a related indirect-developing sea urchin, @entity6798 . Comparisons reveal unexpected patterns of conserved and divergent expression. Cytoplasmic @entity69816 , CyIII, is expressed in the aboral ectoderm cells of the indirect developers, but is an unexpressed pseudogene in H. erythrogramma, which lacks aboral ectoderm. This change is correlated with developmental mode. Two CyII actins are expressed in @entity6798 , and one in H. erythrogramma, but no CyII is expressed in H. tuberculata despite its great developmental similarity to @entity6798 . @entity58841 expression differs slightly between Heliocidaris and @entity6798 with more ectodermal expression in Heliocidaris. Evolutionary changes in @entity69816 gene expression reflect both evolution of developmental mode as well as a surprising flexibility in gene expression within a developmental mode.

Evolutionary changes in sites and timing of XXXX gene expression in embryos of the direct- and indirect-developing sea urchins, Heliocidaris erythrogramma and H. tuberculata.

@entity6798 :: ('7668', 'Species') :: ['Strongylocentrotus purpuratus', 'Strongylocentrotus', 'S. purpuratus'] @entity58841 :: ('373190(Tax:7668)', 'Gene') :: ['CyI'] @entity69816 :: ('752782(Tax:7668)', 'Gene') :: ['actin']
@entity69816 :: (752782(Tax:7668),Gene) :: ['actin']
