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Post-transcriptional modification in prokaryotes

There is very little post-transcriptional modification in prokaryotes. As a result, post-transcriptional modification has only a minor influence on gene expression in prokaryotes.

Translation usually occurs immediately after an mRNA strand has been transcribed, so there is no opportunity for post-transcriptional modification. Both translation and transcription occur in the cytosol.

Post-transcriptional modification does, however, frequently occur in the production of prokaryotic rRNA and tRNA.

In this case, transcription is not followed by translation, so there is time to perform modifications.

Simultaneous transcription and translation in prokaryotes
Simultaneous transcription and translation in prokaryotes