United KingdomA new study published in Nature Microbiology reveals that purine-rich DNA sequences in Bacillus subtilis protect its genes from Rho-dependent termination. Researchers discovered that the high frequency of purines (guanine and adenine) in coding DNA strands prevents Rho, a quality-control protein, from terminating essential RNA transcripts. This finding challenges previous assumptions about the relationship between transcription and translation in bacteria, showing that Rho selectively targets non-coding RNA while allowing functional transcripts to proceed. The study suggests that Rho has influenced the evolutionary development of the B. subtilis genome by promoting purine-rich sequences in coding regions. Bacteria lacking Rho do not display this purine bias.
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