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• W2018809276 abstract "Evidence is described which suggests that a large fraction of sea urchin embryo polyribosomal RNA is not polyadenylated, and that the proportion of poly(A)-containing RNA increases during embryological development. Cleavage, early blastula, and mesenchyme blastula stage embryos were treated with cordycepin, and the effects of the drug on polyribosome appearance were determined. Polyribosomes in cleaving embryos and early blastulae were unaffected by the drug. However, there was a significant reduction in the amount of polyribosomes present and in the amount of newly synthesized RNA entering polyribosomes in mesenchyme blastulae after cordycepin treatment. Polyribosomal RNA was isolated from cleavage, early blastula, and mesenchyme blastula stage embryos, and the RNA was characterized by sucrose gradient centrifugation. Cleaving embryo polyribosomal RNA has a prominent 9 S peak and a smaller 20 S peak, and the larger RNA is heterodisperse. There is no poly(A) associated with the 9 S and 20 S material, but there is poly(A) associated with the RNA sedimenting faster than 20 S. Early blastula and mesenchyme blastula polyribosomal RNA have 22 S and 26 S peaks, respectively. This later stage RNA is quite heterodisperse and poly(A) is associated with RNA in all size classes larger than 9 S. Finally, the proportion of polyadenylated light and heavy polyribosome RNA was determined for cleavage, early blastula, and mesenchyme blastula stage embryos. Approximately 20-25% of newly synthesized light polyribosome RNA is polyadenylated and this amount is relatively constant during early development. However, the proportion of newly synthesized RNA in heavy polyribosomes that is polyadenylated increases during development: 25% at cleavage, 33% at early blastula, and 48% at mesenchyme blastula stages." @default.
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• W2018809276 date "1975-02-01" @default.
• W2018809276 modified "2023-09-26" @default.
• W2018809276 title "Poly(A)-containing polyribosomal RNA in sea urchin embryos: Changes in proportion during development" @default.
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• W2018809276 doi "https://doi.org/10.1016/0005-2787(75)90184-7" @default.
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