Better genetic markers sort out look-alike Vibrio bacteria that standard barcoding blurs
García-Flórez A, Leunda-Esnaola A, Arrufat P, Kaberdin VR, Pearman PB
Microbial Ecology
Vibrio bacteria live in coastal waters, brackish marshes, and the irrigation and runoff that reach shoreline gardens and salt-tolerant crops, so telling harmless species from dangerous ones depends on markers that can actually separate them.
Scientists usually identify bacteria by reading one gene, called 16S, but in the Vibrio group it can't reliably separate close relatives. Genes that exist in just one copy per cell gave much clearer family trees, and they agreed with each other far more than they agreed with 16S. The study picks two genes, mfd and uvrC, as the best candidates for future work, and suggests gene swapping between bacteria may explain why the results differ.
Key Findings
Single-copy Vibrio genes produced more highly resolved phylogenetic trees than 16S and 23S rDNA sequences.
Single-copy loci showed relatively high congruence with one another, while rDNA phylogenies diverged from them (measured with Robinson-Foulds distances).
The genes mfd and uvrC were highlighted as top candidates for Vibrio evolution studies and environmental sample analysis; incongruence may stem from horizontal gene transfer or limited rDNA sequence variability.
chevron_right Technical Summary
The standard DNA barcode used to identify bacteria (16S rDNA) blurs the differences between closely related Vibrio species, while sets of single-copy genes tell them apart much more sharply. Two genes, mfd and uvrC, stand out as better markers for tracking these bacteria in environmental samples.
Abstract Preview
Original paper
Universal single-copy genes and 16S rDNA present incongruent evolutionary histories in vibrio.
A common technique for the study of the diversity and evolution of microbial communities is 16S rDNA sequencing. However, high sequence identity and variable copy number constrain the application o...
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