cpn60 barcode sequences accurately identify newly defined genera within the Lactobacillaceae

Area of Science:

• Microbiology
• Molecular Biology
• Taxonomy

Background:

• The cpN60 barcode is a reliable marker for microbial identification.
• Universal PCR primers and the cpnDB database facilitate cpN60 sequencing applications.
• Recent taxonomic changes in lactobacilli necessitate updating identification frameworks.

Purpose of the Study:

• To update the cpnDB database with new lactobacilli classifications.
• To evaluate the cpN60 barcode's utility for identifying species within the revised Lactobacillus taxonomy.
• To confirm cpN60 sequencing accuracy with updated taxonomic data.

Main Methods:

• Analysis of 275 cpN60 sequences from Lactobacillus, Paralactobacillus, and 23 newly defined genera.
• Comparison of cpN60-based sequence relationships with whole-genome phylogeny.
• Assessment of species identification accuracy using full-length and subsequence cpN60 data.

Main Results:

• cpN60 sequence relationships generally align with whole-genome-based phylogeny.
• Accurate and unambiguous species identification was achieved in most cases using cpN60 sequences (full-length and 150 bp).
• The cpN60 barcode demonstrates utility for identifying lactobacilli according to the latest taxonomic framework.

Conclusions:

• The cpN60 barcode is a robust tool for bacterial species identification, particularly for lactobacilli.
• Updated reference data and universal primers enhance the reliability of cpN60 barcoding.
• This method supports accurate microbial detection and identification within current taxonomic structures.