The identification of Finegoldia dalianensis sp. nov., isolated from the pus of a patient with skin abscess and genomic analysis of the strains belonging to Finegoldia genus.

Objectives: To comprehensively characterize a new species, named Finegoldia dalianensis sp. nov., isolated from the pus of a skin abscess from a patient and genomic analysis of the strains belonging to the Finegoldia genus.

Methods: Strain LY240594 was definitively characterized through phylogenetic, genomic, and biochemical approach. Extensive genomic comparisons, involving the genome of LY240594 and those of 82 Finegoldia strains from GenBank, were instrumental in revealing genetic relationships within the Finegoldia genus.

Results: Strain LY240594 was initially identified as F. magna based on MALDI-TOF MS analysis, showing 99.7 % 16S rRNA gene sequences similarity with the type strain of F. magna CCUG 17636. However, there was 68.5 % similarity with dDDH method and 90.9 % similarity by ANI analysis respectively, between LY240594 and the selected type strain, F. magna DSM 20470. Biochemical differences were also found between two strains. The ANI and genomic analysis of 82 Finegoldia sp. strains and Strain LY240594 revealed that those strains could be categorized into at least three groups using a 95 % ANI threshold.

Conclusion: Comprehensive characterization supported the proposal of a new species within the genus Finegoldia, named Finegoldia dalianensis sp. nov. The type strain, LY240594 (=GDMCC 1.4375 = KCTC 25838), features 1938 genes and a G + C content of 31.8 mol%. Genomic comparisons and ANI studies elucidated substantial heterogeneity within the Finegoldia genus.