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SmallBARNA 2026: a kingdom-wide bacterial sRNA resource.

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This study curates 746 functionally validated bacterial small RNAs (sRNAs) from literature, mapping them to bacterial genomes and quantifying their expression. This provides a crucial resource for understanding bacterial gene regulation and virulence.

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Area of Science:

  • Microbiology
  • Bioinformatics
  • Genomics

Background:

  • Bacterial small RNAs (sRNAs) are critical regulators of gene expression, particularly controlling virulence in pathogenic bacteria.
  • Public repositories show an exponential increase in predicted sRNAs, but a linear growth in functionally validated ones.
  • A centralized, comprehensive database for bona fide bacterial sRNAs with supporting evidence, alignment, and expression data is lacking.

Purpose of the Study:

  • To create a centralized, curated repository of functionally validated bacterial small RNAs (sRNAs).
  • To provide essential data for both experimental biologists and bioinformaticians in the field of bacterial sRNA research.
  • To facilitate the discovery and validation of novel sRNAs and improve prediction models.

Main Methods:

  • Hand-curation of 1117 scientific articles to identify 746 functionally validated sRNAs.
  • Mapping of validated sRNA sequences to 44,789 bacterial chromosomes and 10,884 plasmids from NCBI.
  • Quantification of sRNA expression using RNA-seq data from 5,292 bacterial isolates.

Main Results:

  • A comprehensive dataset of 746 functionally validated bacterial sRNAs was compiled.
  • 3.8 million mapping hits were obtained across a wide range of bacterial chromosomes and plasmids.
  • Expression levels for these validated sRNAs were quantified in a large set of bacterial isolates.

Conclusions:

  • The developed repository serves as a vital resource for the bacterial sRNA research community.
  • It bridges the gap between predicted and functionally validated sRNAs, aiding future research.
  • The integrated data supports experimental validation and computational sRNA discovery.