Abstract
The messenger ribonucleic acid (mRNA) pattern of log-phase and sporulating cells of Bacillus subtilis has been analyzed by deoxyribonucleic acid (DNA)-RNA hybrid studies with the complementary-strand fragments of DNA. Approximately 80% of the mRNA of log-phase and sporulating cells from stages I, III, and IV hybridizes with the heavy DNA fragments, and 20% hybridizes with the light DNA fragments. Hybrid competition studies indicated that there was either a greatly reduced rate of transcription or a turn-off of some log-phase genes during the sporulation stages. However, a significant amount of log-phase gene transcription occurred even at late stages of sporulation. Similar studies indicate a significantly increased rate of transcription or a turn-on of sporulation phase genes during the latter stages of sproulation. There is a sequential increase in the amount of sporulation-specific transcription from both complementary-strand fragments of DNA. These results indicate that the RNA polymerase population in sporulating cells can transcribe both log-phase and sporulation-phase genes.
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