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A Fast and Reliable Pipeline for Bacterial Transcriptome Analysis Case study: Serine-dependent Gene Regulation in Streptococcus pneumoniae
Published on: April 25, 2015
Evaluation of microbial RNA extractions from Streptococcus pneumoniae
Ha-Sheng Li-Korotky1, Lori A Kelly, Otavio Piltcher
1Division of Pediatric Otolaryngology, Children's Hospital of Pittsburgh, Pittsburgh, Pennsylvania, 15213, USA. Ha-Sheng.Li@chp.edu
Journal of Microbiological Methods
|November 11, 2006
Summary
This study optimized RNA extraction from Streptococcus pneumoniae, enabling better detection of virulence factors. The new method efficiently identifies bacteria in small samples, aiding research into otitis media.
Area of Science:
- Microbiology
- Molecular Biology
- Genetics
Background:
- Understanding Streptococcus pneumoniae pathogenesis requires efficient microbial RNA extraction from clinical samples.
- Current methods may not be sensitive enough for detecting low bacterial titers.
Purpose of the Study:
- To develop and optimize a method for isolating intact total RNA from Streptococcus pneumoniae.
- To enhance the sensitivity of detecting pneumococcal RNA for virulence studies.
Main Methods:
- Comparison of various lysis/extraction methods, including mechanical homogenization in TRIZOL.
- Evaluation of RNA extraction efficiency and sensitivity using reverse transcription polymerase chain reaction (RT-PCR).
- Addition of polyinosinic acid (Poly I) as an RNA carrier to improve assay sensitivity.
Main Results:
- Mechanical homogenization in TRIZOL proved most effective for microbial RNA release.
- Addition of Poly I increased assay sensitivity to 10(2) colony forming units for specific gene targets.
- Penicillin binding protein 2b was detected in rat middle ear mucosa post-infection.
Conclusions:
- A robust RNA extraction methodology was established for identifying pneumococcal virulence genes from low-titer samples.
- This method has significant potential for clinical studies on nasopharyngeal colonization and otitis media.
- Optimized RNA extraction is crucial for advancing research into pneumococcal disease mechanisms.
