Abstract
The intense study of Helicobacter pylori, one of the most prevalent human pathogens, has contributed much to understanding of bacterial virulence mechanisms. While genome sequencing revealed a high genetic diversity among Helicobacter strains, its transcriptional organization has been less understood. The H. pylori genome encodes for only a small number of transcriptional regulators, and little is known about the role of posttranscriptional gene regulation and the mechanisms and functions of small regulatory RNAs (sRNAs) in Epsilonproteobacteria. Until recently, Helicobacter was even regarded as a bacterium without RNA-based regulation (riboregulation). However, the development of deep sequencing technology and its application to massively parallel high-throughput cDNA analysis (RNA-seq) has revolutionized transcriptome analysis of pro- and eukaryotes. A differential RNA-seq (dRNA-seq) study of H. pylori strain 26695 selective for primary transcriptome analysis allowed for genome-wide mapping of transcriptional start sites. This study also revealed an unexpectedly complex and compact transcriptional output from the small H. pylori genome. Besides an extensive antisense transcription, more than 60 sRNA candidates were identified, including potential regulators of cis- and trans-encoded target mRNAs. This indicates that posttranscriptional regulation represents an extensive layer of gene expression control in Helicobacter. In this chapter we review how RNA-seq has facilitated transcriptome annotation and identification of novel regulatory features in H. pylori and what is currently known about sRNAs in this widespread gastric pathogen.
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Pernitzsch, S.R., Darfeuille, F., Sharma, C.M. (2016). The Primary Transcriptome and Noncoding RNA Repertoire of Helicobacter pylori . In: Backert, S., Yamaoka, Y. (eds) Helicobacter pylori Research. Springer, Tokyo. https://doi.org/10.1007/978-4-431-55936-8_8
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