Abstract
An increase in the synthesis of polyadenylic acid, following fertilization, was examined in sea urchin, Strongylocentrotus purpuratus, and the marine worm Urechis caupo embryos. It was found that in both organisms there is a large increase in the incorporation of [ 3H]adenosine into the poly(A) region, of poly(A)-containing RNA, in the phase preceding the 2-cell stage. In sea urchin this rise was localized to the G 2 period. Similar findings were made in Urechis indicating that polyadenylation of RNA may be a common postfertilization event in many developing organisms.
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