Dev Growth Differ 1981 Jan 01;232:137-147. doi: 10.1111/j.1440-169X.1981.00137.x.

Vegetalization of Sea Urchin Larvae Induced with Cycloheximide.

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The embryos, kept at 20°C for 3 hr-6 hr from the time of fertilization (at the morula stage), were cultured in sea water containing cycloheximide (10-16 mM) for successive 3 hr and then transferred to normal sea water. The embryos, thus treated, became vegetalized larvae. With the same treatment performed at a developmental stage prior to 3 hr of fertilization, most of embryos developed to small blastulae filled with mesenchyme-like cells. The treatment at a stage after 6 hr of fertilization yielded normal plutei. From the embryos exposed to both 14 C-leucine and 3 H-thymidine during the treatment, labelled chromatin was isolated. Only in the presumptive vegetalized embryos obtained by the cycloheximide treatment of morulae, ratio of 14 C-radioactivity found in proteins of chromatin to 3 H-radioactivity in DNA was markedly lower than that observed in chromatin from control embryos. The rate of 3 H-radioactivity-decrease by DNase I treatment was higher in chromatin isolated from the presumptive regetalized embryos than that observed in chromatin isolated from control ones. Probable failure of chromatin structure formation, due to cycloheximide-inhibition of chromatin protein synthesis, seems to disturb the determination in the embryos at the morula stage, resulting in an induction of vegetalized embryos.

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