Quantitative mapping of pseudouridines in bacterial RNA

Area of Science:

• Microbiology
• Molecular Biology
• Genomics

Background:

• Pseudouridines are common RNA modifications, but their role in bacterial messenger RNA (mRNA) is largely unknown.
• Previous studies focused on transfer RNA (tRNA) and ribosomal RNA (rRNA), leaving bacterial mRNA modifications understudied.

Purpose of the Study:

• To comprehensively map and quantify pseudouridine modifications in bacterial mRNA.
• To investigate the functional implications of mRNA pseudouridylation in bacteria.
• To demonstrate the applicability of the developed method in complex microbial communities.

Main Methods:

• Utilized a bisulfite-based deep sequencing approach for quantitative pseudouridine mapping.
• Applied the method to Escherichia coli (E. coli) as a proof of concept.
• Extended the application to human oral microbiome samples.

Main Results:

• Identified 1,954 high-confidence pseudouridine sites in 1,331 E. coli transcripts, a 29-fold increase over previous estimates, covering nearly 30% of the transcriptome.
• Found significant associations between pseudouridines and increased mRNA stability.
• Observed enrichment of pseudouridines in transcripts related to secondary metabolite production and environmental adaptation.
• Noted a trend of higher pseudouridine levels in GC-rich bacterial genomes compared to AT-rich genomes.

Conclusions:

• The study provides a robust method for mapping bacterial mRNA pseudouridines, revealing their widespread nature and functional significance.
• Pseudouridylation appears to play a crucial role in bacterial post-transcriptional regulation, influencing mRNA stability and gene expression.
• The developed approach is applicable to complex microbial ecosystems, opening avenues for studying microbial community dynamics and regulation.