Bacterial reference genes for gene expression studies by RT-qPCR: survey and analysis

Area of Science:

• Microbiology
• Molecular Biology
• Bioinformatics

Background:

• Accurate gene expression normalization via reverse transcription quantitative real-time PCR (RT-qPCR) relies on appropriate reference gene selection.
• The Minimum Information for Publication of Quantitative Real-Time PCR Experiments (MIQE) guidelines emphasize validating multiple reference genes for reliable RT-qPCR results.

Purpose of the Study:

• To identify and evaluate bacterial reference genes commonly validated in RT-qPCR studies within five years of the MIQE guidelines.
• To provide a guideline for selecting candidate reference genes for bacterial RT-qPCR studies.

Main Methods:

• Literature search using text mining tool MedlineRanker to identify candidate bacterial reference genes.
• Experimental validation of gene expression stability using geNorm and NormFinder software.
• Gene Ontology enrichment analysis to identify functional categories of validated reference genes.

Main Results:

• 145 unique bacterial genes were tested as candidates, with 45 experimentally validated.
• Only 10 validated reference genes appeared in two or more studies.
• Genes involved in DNA Replication and Transcription were proportionally enriched among validated reference genes.

Conclusions:

• Genes in DNA Replication and Transcription functional categories are promising candidates for bacterial reference genes.
• Validated reference genes, particularly those in DNA Replication, can guide the initial selection for RT-qPCR studies in various bacterial species.