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Identification of small RNAs in Mycobacterium tuberculosis
Article first published online: 23 JUN 2009
© 2009 Medical Research Council. Journal compilation © 2009 Blackwell Publishing Ltd
Volume 73, Issue 3, pages 397–408, August 2009
How to Cite
Arnvig, K. B. and Young, D. B. (2009), Identification of small RNAs in Mycobacterium tuberculosis. Molecular Microbiology, 73: 397–408. doi: 10.1111/j.1365-2958.2009.06777.x
- Issue published online: 24 JUL 2009
- Article first published online: 23 JUN 2009
- Accepted 14 June, 2009.
In spite of being one of our most prominent bacterial pathogens, the presence of small regulatory RNAs (sRNAs) has not previously been investigated in Mycobacterium tuberculosis. Post-transcriptional regulation of gene expression by sRNA molecules has been demonstrated in a wide range of pathogenic bacteria and has been shown to play a significant role in the control of virulence. By screening cDNA libraries prepared from low-molecular weight RNA from M. tuberculosis we have identified nine putative sRNA molecules, including cis-encoded antisense transcripts from within open reading frames and trans-encoded transcripts from intergenic regions. sRNAs displayed differential expression between exponential and stationary phase, and during a variety of stress conditions. Two of the cis-encoded sRNAs were associated with genes encoding enzymes involved in lipid metabolism, desA1 and pks12. These sRNAs showed complementarity to multiple M. tuberculosis genes, suggesting the potential to act as both cis-encoded and trans-encoded sRNAs. Overexpression of selected trans-encoded sRNAs had profound impact on growth of M. tuberculosis and M. smegmatis. This is the first experimental evidence of sRNAs in M. tuberculosis and it will be important to consider the potential influence of sRNA regulation when studying the transcriptome and the proteome of M. tuberculosis during infection.