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• W2029923078 abstract "Nuclei have been isolated from Xenopus laevis embryos and incubated under conditions allowing RNA synthesis to proceed for more than 3 h. The RNA molecules synthesized on the endogenous template are stable, heterogeneous in size and correspond to the activities of the three RNA polymerases. In these in vitro conditions we have determined the extent of activity of the three RNA polymerases during the embryonic development from blastula to swimming tadpole. Our results on isolated nuclei are in good agreement with the changes in RNA synthesis which take place during normal embryonic development. We have measured both the “template-bound” and the “free” activities of each of the three RNA polymerases during development. Amongst the total RNA polymerase activities engaged on the template, the proportion of polymerase I increases as development proceeds: at the blastula stage, there is practically no RNA polymerase I engaged on the template, whereas in swimming tadpoles, RNA polymerase I amounts to about 90% of the RNA polymerases bound to the DNA. Conversely, RNA polymerase I represents the major part of free RNA polymerases in blastula nuclei. Autoradiography of incubated nuclei shows that, at least in swimming tadpoles nuclei, both “free” and “template-bound” RNA polymerase I are localized in the nucleoli. The evolution of “template-bound” RNA polymerase II activity during development is quite different from that of RNA polymerase I: RNA polymerase II activity represents 75% of engaged polymerase activity in blastulae and only 47% at the swimming tadpoles stage. The results suggest that part of the “free” RNA polymerase I activity might progressively become “template-bound” during embryogenesis." @default.
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• W2029923078 date "1980-05-01" @default.
• W2029923078 modified "2023-10-17" @default.
• W2029923078 title "Changes in “template-bound” and “free” RNA polymerase activities in isolated nuclei from Xenopus laevis embryos" @default.
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• W2029923078 doi "https://doi.org/10.1016/0014-4827(80)90415-2" @default.
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