Flickinger RA. Relative base composition of initiation sites for transcription in developing frog embryos.
CELL DIFFERENTIATION 1982;
11:63-9. [PMID:
6978186 DOI:
10.1016/0045-6039(82)90020-3]
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Abstract
The use of an inhibitor (0.4 N (NH4)2SO4) and an activator (sodium polydextran sulfate) of initiation of transcription in nuclei of frog embryos in vitro indicated that initiation sites for transcription are relatively A--T-rich. Comparison of incorporation of labeled ATP, UTP, and GTP, when initiation of transcription is prevented, indicates that initiation sites become relatively less A--T-rich as development proceeds. Inhibition of initiation of transcription in isolated nuclei blocks the normal increase in rate of transcription that occurs when cells enter the S phase, showing that an increased level of transcription depends upon a greater number of initiation sites.
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